blob: b445524b1f0b8b38ae9d13f030d7cdf171558a78 [file] [log] [blame]
/*
* block queue tracing application
*
* Copyright (C) 2005 Jens Axboe <axboe@suse.de>
* Copyright (C) 2006 Jens Axboe <axboe@kernel.dk>
*
* Rewrite to have a single thread per CPU (managing all devices on that CPU)
* Alan D. Brunelle <alan.brunelle@hp.com> - January 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <getopt.h>
#include <sched.h>
#include <unistd.h>
#include <poll.h>
#include <signal.h>
#include <pthread.h>
#include <locale.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/sendfile.h>
#include "btt/list.h"
#include "blktrace.h"
/*
* You may want to increase this even more, if you are logging at a high
* rate and see skipped/missed events
*/
#define BUF_SIZE (512 * 1024)
#define BUF_NR (4)
#define FILE_VBUF_SIZE (128 * 1024)
#define DEBUGFS_TYPE (0x64626720)
#define TRACE_NET_PORT (8462)
enum {
Net_none = 0,
Net_server,
Net_client,
};
enum thread_status {
Th_running,
Th_leaving,
Th_error
};
/*
* Generic stats collected: nevents can be _roughly_ estimated by data_read
* (discounting pdu...)
*
* These fields are updated w/ pdc_dr_update & pdc_nev_update below.
*/
struct pdc_stats {
unsigned long long data_read;
unsigned long long nevents;
};
struct devpath {
struct list_head head;
char *path; /* path to device special file */
char *buts_name; /* name returned from bt kernel code */
struct pdc_stats *stats;
int fd, ncpus;
unsigned long long drops;
/*
* For piped output only:
*
* Each tracer will have a tracer_devpath_head that it will add new
* data onto. It's list is protected above (tracer_devpath_head.mutex)
* and it will signal the processing thread using the dp_cond,
* dp_mutex & dp_entries variables above.
*/
struct tracer_devpath_head *heads;
/*
* For network server mode only:
*/
struct cl_host *ch;
u32 cl_id;
time_t cl_connect_time;
struct io_info *ios;
};
/*
* For piped output to stdout we will have each tracer thread (one per dev)
* tack buffers read from the relay queues on a per-device list.
*
* The main thread will then collect trace buffers from each of lists in turn.
*
* We will use a mutex to guard each of the trace_buf list. The tracers
* can then signal the main thread using <dp_cond,dp_mutex> and
* dp_entries. (When dp_entries is 0, and a tracer adds an entry it will
* signal. When dp_entries is 0, the main thread will wait for that condition
* to be signalled.)
*
* adb: It may be better just to have a large buffer per tracer per dev,
* and then use it as a ring-buffer. This would certainly cut down a lot
* of malloc/free thrashing, at the cost of more memory movements (potentially).
*/
struct trace_buf {
struct list_head head;
struct devpath *dpp;
void *buf;
int cpu, len;
};
struct tracer_devpath_head {
pthread_mutex_t mutex;
struct list_head head;
struct trace_buf *prev;
};
/*
* Used to handle the mmap() interfaces for output file (containing traces)
*/
struct mmap_info {
void *fs_buf;
unsigned long long fs_size, fs_max_size, fs_off, fs_buf_len;
unsigned long buf_size, buf_nr;
int pagesize;
};
/*
* Each thread doing work on a (client) side of blktrace will have one
* of these. The ios array contains input/output information, pfds holds
* poll() data. The volatile's provide flags to/from the main executing
* thread.
*/
struct tracer {
struct list_head head;
struct io_info *ios;
struct pollfd *pfds;
pthread_t thread;
int cpu, nios;
volatile int status, is_done;
};
/*
* networking stuff follows. we include a magic number so we know whether
* to endianness convert or not.
*
* The len field is overloaded:
* 0 - Indicates an "open" - allowing the server to set up for a dev/cpu
* 1 - Indicates a "close" - Shut down connection orderly
*
* The cpu field is overloaded on close: it will contain the number of drops.
*/
struct blktrace_net_hdr {
u32 magic; /* same as trace magic */
char buts_name[32]; /* trace name */
u32 cpu; /* for which cpu */
u32 max_cpus;
u32 len; /* length of following trace data */
u32 cl_id; /* id for set of client per-cpu connections */
u32 buf_size; /* client buf_size for this trace */
u32 buf_nr; /* client buf_nr for this trace */
u32 page_size; /* client page_size for this trace */
};
/*
* Each host encountered has one of these. The head is used to link this
* on to the network server's ch_list. Connections associated with this
* host are linked on conn_list, and any devices traced on that host
* are connected on the devpaths list.
*/
struct cl_host {
struct list_head head;
struct list_head conn_list;
struct list_head devpaths;
struct net_server_s *ns;
char *hostname;
struct in_addr cl_in_addr;
int connects, ndevs, cl_opens;
};
/*
* Each connection (client to server socket ('fd')) has one of these. A
* back reference to the host ('ch'), and lists headers (for the host
* list, and the network server conn_list) are also included.
*/
struct cl_conn {
struct list_head ch_head, ns_head;
struct cl_host *ch;
int fd, ncpus;
time_t connect_time;
};
/*
* The network server requires some poll structures to be maintained -
* one per conection currently on conn_list. The nchs/ch_list values
* are for each host connected to this server. The addr field is used
* for scratch as new connections are established.
*/
struct net_server_s {
struct list_head conn_list;
struct list_head ch_list;
struct pollfd *pfds;
int listen_fd, connects, nchs;
struct sockaddr_in addr;
};
/*
* This structure is (generically) used to providide information
* for a read-to-write set of values.
*
* ifn & ifd represent input information
*
* ofn, ofd, ofp, obuf & mmap_info are used for output file (optionally).
*/
struct io_info {
struct devpath *dpp;
FILE *ofp;
char *obuf;
struct cl_conn *nc; /* Server network connection */
/*
* mmap controlled output files
*/
struct mmap_info mmap_info;
/*
* Client network fields
*/
unsigned int ready;
unsigned long long data_queued;
/*
* Input/output file descriptors & names
*/
int ifd, ofd;
char ifn[MAXPATHLEN + 64];
char ofn[MAXPATHLEN + 64];
};
static char blktrace_version[] = "2.0.0";
/*
* Linkage to blktrace helper routines (trace conversions)
*/
int data_is_native = -1;
static int ndevs;
static int ncpus;
static int pagesize;
static int act_mask = ~0U;
static int kill_running_trace;
static int stop_watch;
static int piped_output;
static char *debugfs_path = "/sys/kernel/debug";
static char *output_name;
static char *output_dir;
static unsigned long buf_size = BUF_SIZE;
static unsigned long buf_nr = BUF_NR;
static FILE *pfp;
static LIST_HEAD(devpaths);
static LIST_HEAD(tracers);
static volatile int done;
/*
* tracer threads add entries, the main thread takes them off and processes
* them. These protect the dp_entries variable.
*/
static pthread_cond_t dp_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t dp_mutex = PTHREAD_MUTEX_INITIALIZER;
static volatile int dp_entries;
/*
* These synchronize master / thread interactions.
*/
static pthread_cond_t mt_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t mt_mutex = PTHREAD_MUTEX_INITIALIZER;
static volatile int nthreads_running;
static volatile int nthreads_leaving;
static volatile int nthreads_error;
static volatile int tracers_run;
/*
* network cmd line params
*/
static struct sockaddr_in hostname_addr;
static char hostname[MAXHOSTNAMELEN];
static int net_port = TRACE_NET_PORT;
static int net_use_sendfile = 1;
static int net_mode;
static int *cl_fds;
static int (*handle_pfds)(struct tracer *, int, int);
static int (*handle_list)(struct tracer_devpath_head *, struct list_head *);
#define S_OPTS "d:a:A:r:o:kw:vVb:n:D:lh:p:sI:"
static struct option l_opts[] = {
{
.name = "dev",
.has_arg = required_argument,
.flag = NULL,
.val = 'd'
},
{
.name = "input-devs",
.has_arg = required_argument,
.flag = NULL,
.val = 'I'
},
{
.name = "act-mask",
.has_arg = required_argument,
.flag = NULL,
.val = 'a'
},
{
.name = "set-mask",
.has_arg = required_argument,
.flag = NULL,
.val = 'A'
},
{
.name = "relay",
.has_arg = required_argument,
.flag = NULL,
.val = 'r'
},
{
.name = "output",
.has_arg = required_argument,
.flag = NULL,
.val = 'o'
},
{
.name = "kill",
.has_arg = no_argument,
.flag = NULL,
.val = 'k'
},
{
.name = "stopwatch",
.has_arg = required_argument,
.flag = NULL,
.val = 'w'
},
{
.name = "version",
.has_arg = no_argument,
.flag = NULL,
.val = 'v'
},
{
.name = "version",
.has_arg = no_argument,
.flag = NULL,
.val = 'V'
},
{
.name = "buffer-size",
.has_arg = required_argument,
.flag = NULL,
.val = 'b'
},
{
.name = "num-sub-buffers",
.has_arg = required_argument,
.flag = NULL,
.val = 'n'
},
{
.name = "output-dir",
.has_arg = required_argument,
.flag = NULL,
.val = 'D'
},
{
.name = "listen",
.has_arg = no_argument,
.flag = NULL,
.val = 'l'
},
{
.name = "host",
.has_arg = required_argument,
.flag = NULL,
.val = 'h'
},
{
.name = "port",
.has_arg = required_argument,
.flag = NULL,
.val = 'p'
},
{
.name = "no-sendfile",
.has_arg = no_argument,
.flag = NULL,
.val = 's'
},
{
.name = NULL,
}
};
static char usage_str[] = "\n\n" \
"-d <dev> | --dev=<dev>\n" \
"[ -r <debugfs path> | --relay=<debugfs path> ]\n" \
"[ -o <file> | --output=<file>]\n" \
"[ -D <dir> | --output-dir=<dir>\n" \
"[ -w <time> | --stopwatch=<time>]\n" \
"[ -a <action field> | --act-mask=<action field>]\n" \
"[ -A <action mask> | --set-mask=<action mask>]\n" \
"[ -b <size> | --buffer-size]\n" \
"[ -n <number> | --num-sub-buffers=<number>]\n" \
"[ -l | --listen]\n" \
"[ -h <hostname> | --host=<hostname>]\n" \
"[ -p <port number> | --port=<port number>]\n" \
"[ -s | --no-sendfile]\n" \
"[ -I <devs file> | --input-devs=<devs file>]\n" \
"[ -v <version> | --version]\n" \
"[ -V <version> | --version]\n" \
"\t-d Use specified device. May also be given last after options\n" \
"\t-r Path to mounted debugfs, defaults to /sys/kernel/debug\n" \
"\t-o File(s) to send output to\n" \
"\t-D Directory to prepend to output file names\n" \
"\t-w Stop after defined time, in seconds\n" \
"\t-a Only trace specified actions. See documentation\n" \
"\t-A Give trace mask as a single value. See documentation\n" \
"\t-b Sub buffer size in KiB (default 512)\n" \
"\t-n Number of sub buffers (default 4)\n" \
"\t-l Run in network listen mode (blktrace server)\n" \
"\t-h Run in network client mode, connecting to the given host\n" \
"\t-p Network port to use (default 8462)\n" \
"\t-s Make the network client NOT use sendfile() to transfer data\n" \
"\t-I Add devices found in <devs file>\n" \
"\t-v Print program version info\n" \
"\t-V Print program version info\n\n";
static void clear_events(struct pollfd *pfd)
{
pfd->events = 0;
pfd->revents = 0;
}
static inline int net_client_use_sendfile(void)
{
return net_mode == Net_client && net_use_sendfile;
}
static inline int net_client_use_send(void)
{
return net_mode == Net_client && !net_use_sendfile;
}
static inline int use_tracer_devpaths(void)
{
return piped_output || net_client_use_send();
}
static inline int in_addr_eq(struct in_addr a, struct in_addr b)
{
return a.s_addr == b.s_addr;
}
static inline void pdc_dr_update(struct devpath *dpp, int cpu, int data_read)
{
dpp->stats[cpu].data_read += data_read;
}
static inline void pdc_nev_update(struct devpath *dpp, int cpu, int nevents)
{
dpp->stats[cpu].nevents += nevents;
}
static void show_usage(char *prog)
{
fprintf(stderr, "Usage: %s %s", prog, usage_str);
}
/*
* Create a timespec 'msec' milliseconds into the future
*/
static inline void make_timespec(struct timespec *tsp, long delta_msec)
{
struct timeval now;
gettimeofday(&now, NULL);
tsp->tv_sec = now.tv_sec;
tsp->tv_nsec = 1000L * now.tv_usec;
tsp->tv_nsec += (delta_msec * 1000000L);
if (tsp->tv_nsec > 1000000000L) {
long secs = tsp->tv_nsec / 1000000000L;
tsp->tv_sec += secs;
tsp->tv_nsec -= (secs * 1000000000L);
}
}
/*
* Add a timer to ensure wait ends
*/
static void t_pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
struct timespec ts;
make_timespec(&ts, 50);
pthread_cond_timedwait(cond, mutex, &ts);
}
static void unblock_tracers(void)
{
pthread_mutex_lock(&mt_mutex);
tracers_run = 1;
pthread_cond_broadcast(&mt_cond);
pthread_mutex_unlock(&mt_mutex);
}
static void tracer_wait_unblock(struct tracer *tp)
{
pthread_mutex_lock(&mt_mutex);
while (!tp->is_done && !tracers_run)
pthread_cond_wait(&mt_cond, &mt_mutex);
pthread_mutex_unlock(&mt_mutex);
}
static void tracer_signal_ready(struct tracer *tp,
enum thread_status th_status,
int status)
{
pthread_mutex_lock(&mt_mutex);
tp->status = status;
if (th_status == Th_running)
nthreads_running++;
else if (th_status == Th_error)
nthreads_error++;
else
nthreads_leaving++;
pthread_cond_signal(&mt_cond);
pthread_mutex_unlock(&mt_mutex);
}
static void wait_tracers_ready(int ncpus_started)
{
pthread_mutex_lock(&mt_mutex);
while ((nthreads_running + nthreads_error) < ncpus_started)
t_pthread_cond_wait(&mt_cond, &mt_mutex);
pthread_mutex_unlock(&mt_mutex);
}
static void wait_tracers_leaving(void)
{
pthread_mutex_lock(&mt_mutex);
while (nthreads_leaving < nthreads_running)
t_pthread_cond_wait(&mt_cond, &mt_mutex);
pthread_mutex_unlock(&mt_mutex);
}
static void init_mmap_info(struct mmap_info *mip)
{
mip->buf_size = buf_size;
mip->buf_nr = buf_nr;
mip->pagesize = pagesize;
}
static void net_close_connection(int *fd)
{
shutdown(*fd, SHUT_RDWR);
close(*fd);
*fd = -1;
}
static void dpp_free(struct devpath *dpp)
{
if (dpp->stats)
free(dpp->stats);
if (dpp->ios)
free(dpp->ios);
if (dpp->path)
free(dpp->path);
if (dpp->buts_name)
free(dpp->buts_name);
free(dpp);
}
static int lock_on_cpu(int cpu)
{
cpu_set_t * cpu_mask;
size_t size;
cpu_mask = CPU_ALLOC(ncpus);
size = CPU_ALLOC_SIZE(ncpus);
CPU_ZERO_S(size, cpu_mask);
CPU_SET_S(cpu, size, cpu_mask);
if (sched_setaffinity(0, size, cpu_mask) < 0) {
CPU_FREE(cpu_mask);
return errno;
}
CPU_FREE(cpu_mask);
return 0;
}
static int increase_limit(int resource, rlim_t increase)
{
struct rlimit rlim;
int save_errno = errno;
if (!getrlimit(resource, &rlim)) {
rlim.rlim_cur += increase;
if (rlim.rlim_cur >= rlim.rlim_max)
rlim.rlim_max = rlim.rlim_cur + increase;
if (!setrlimit(resource, &rlim))
return 1;
}
errno = save_errno;
return 0;
}
static int handle_open_failure(void)
{
if (errno == ENFILE || errno == EMFILE)
return increase_limit(RLIMIT_NOFILE, 16);
return 0;
}
static int handle_mem_failure(size_t length)
{
if (errno == ENFILE)
return handle_open_failure();
else if (errno == ENOMEM)
return increase_limit(RLIMIT_MEMLOCK, 2 * length);
return 0;
}
static FILE *my_fopen(const char *path, const char *mode)
{
FILE *fp;
do {
fp = fopen(path, mode);
} while (fp == NULL && handle_open_failure());
return fp;
}
static int my_open(const char *path, int flags)
{
int fd;
do {
fd = open(path, flags);
} while (fd < 0 && handle_open_failure());
return fd;
}
static int my_socket(int domain, int type, int protocol)
{
int fd;
do {
fd = socket(domain, type, protocol);
} while (fd < 0 && handle_open_failure());
return fd;
}
static int my_accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
{
int fd;
do {
fd = accept(sockfd, addr, addrlen);
} while (fd < 0 && handle_open_failure());
return fd;
}
static void *my_mmap(void *addr, size_t length, int prot, int flags, int fd,
off_t offset)
{
void *new;
do {
new = mmap(addr, length, prot, flags, fd, offset);
} while (new == MAP_FAILED && handle_mem_failure(length));
return new;
}
static int my_mlock(struct tracer *tp,
const void *addr, size_t len)
{
int ret, retry = 0;
do {
ret = mlock(addr, len);
if ((retry >= 10) && tp && tp->is_done)
break;
retry++;
} while (ret < 0 && handle_mem_failure(len));
return ret;
}
static int setup_mmap(int fd, unsigned int maxlen,
struct mmap_info *mip,
struct tracer *tp)
{
if (mip->fs_off + maxlen > mip->fs_buf_len) {
unsigned long nr = max(16, mip->buf_nr);
if (mip->fs_buf) {
munlock(mip->fs_buf, mip->fs_buf_len);
munmap(mip->fs_buf, mip->fs_buf_len);
mip->fs_buf = NULL;
}
mip->fs_off = mip->fs_size & (mip->pagesize - 1);
mip->fs_buf_len = (nr * mip->buf_size) - mip->fs_off;
mip->fs_max_size += mip->fs_buf_len;
if (ftruncate(fd, mip->fs_max_size) < 0) {
perror("setup_mmap: ftruncate");
return 1;
}
mip->fs_buf = my_mmap(NULL, mip->fs_buf_len, PROT_WRITE,
MAP_SHARED, fd,
mip->fs_size - mip->fs_off);
if (mip->fs_buf == MAP_FAILED) {
perror("setup_mmap: mmap");
return 1;
}
if (my_mlock(tp, mip->fs_buf, mip->fs_buf_len) < 0) {
perror("setup_mlock: mlock");
return 1;
}
}
return 0;
}
static int __stop_trace(int fd)
{
/*
* Should be stopped, don't complain if it isn't
*/
ioctl(fd, BLKTRACESTOP);
return ioctl(fd, BLKTRACETEARDOWN);
}
static int write_data(char *buf, int len)
{
int ret;
rewrite:
ret = fwrite(buf, len, 1, pfp);
if (ferror(pfp) || ret != 1) {
if (errno == EINTR) {
clearerr(pfp);
goto rewrite;
}
if (!piped_output || (errno != EPIPE && errno != EBADF)) {
fprintf(stderr, "write(%d) failed: %d/%s\n",
len, errno, strerror(errno));
}
goto err;
}
fflush(pfp);
return 0;
err:
clearerr(pfp);
return 1;
}
/*
* Returns the number of bytes read (successfully)
*/
static int __net_recv_data(int fd, void *buf, unsigned int len)
{
unsigned int bytes_left = len;
while (bytes_left && !done) {
int ret = recv(fd, buf, bytes_left, MSG_WAITALL);
if (ret == 0)
break;
else if (ret < 0) {
if (errno == EAGAIN) {
usleep(50);
continue;
}
perror("server: net_recv_data: recv failed");
break;
} else {
buf += ret;
bytes_left -= ret;
}
}
return len - bytes_left;
}
static int net_recv_data(int fd, void *buf, unsigned int len)
{
return __net_recv_data(fd, buf, len);
}
/*
* Returns number of bytes written
*/
static int net_send_data(int fd, void *buf, unsigned int buf_len)
{
int ret;
unsigned int bytes_left = buf_len;
while (bytes_left) {
ret = send(fd, buf, bytes_left, 0);
if (ret < 0) {
perror("send");
break;
}
buf += ret;
bytes_left -= ret;
}
return buf_len - bytes_left;
}
static int net_send_header(int fd, int cpu, char *buts_name, int len)
{
struct blktrace_net_hdr hdr;
memset(&hdr, 0, sizeof(hdr));
hdr.magic = BLK_IO_TRACE_MAGIC;
memset(hdr.buts_name, 0, sizeof(hdr.buts_name));
strncpy(hdr.buts_name, buts_name, sizeof(hdr.buts_name));
hdr.buts_name[sizeof(hdr.buts_name) - 1] = '\0';
hdr.cpu = cpu;
hdr.max_cpus = ncpus;
hdr.len = len;
hdr.cl_id = getpid();
hdr.buf_size = buf_size;
hdr.buf_nr = buf_nr;
hdr.page_size = pagesize;
return net_send_data(fd, &hdr, sizeof(hdr)) != sizeof(hdr);
}
static void net_send_open_close(int fd, int cpu, char *buts_name, int len)
{
struct blktrace_net_hdr ret_hdr;
net_send_header(fd, cpu, buts_name, len);
net_recv_data(fd, &ret_hdr, sizeof(ret_hdr));
}
static void net_send_open(int fd, int cpu, char *buts_name)
{
net_send_open_close(fd, cpu, buts_name, 0);
}
static void net_send_close(int fd, char *buts_name, int drops)
{
/*
* Overload CPU w/ number of drops
*
* XXX: Need to clear/set done around call - done=1 (which
* is true here) stops reads from happening... :-(
*/
done = 0;
net_send_open_close(fd, drops, buts_name, 1);
done = 1;
}
static void ack_open_close(int fd, char *buts_name)
{
net_send_header(fd, 0, buts_name, 2);
}
static void net_send_drops(int fd)
{
struct list_head *p;
__list_for_each(p, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
net_send_close(fd, dpp->buts_name, dpp->drops);
}
}
/*
* Returns:
* 0: "EOF"
* 1: OK
* -1: Error
*/
static int net_get_header(struct cl_conn *nc, struct blktrace_net_hdr *bnh)
{
int bytes_read;
int fl = fcntl(nc->fd, F_GETFL);
fcntl(nc->fd, F_SETFL, fl | O_NONBLOCK);
bytes_read = __net_recv_data(nc->fd, bnh, sizeof(*bnh));
fcntl(nc->fd, F_SETFL, fl & ~O_NONBLOCK);
if (bytes_read == sizeof(*bnh))
return 1;
else if (bytes_read == 0)
return 0;
else
return -1;
}
static int net_setup_addr(void)
{
struct sockaddr_in *addr = &hostname_addr;
memset(addr, 0, sizeof(*addr));
addr->sin_family = AF_INET;
addr->sin_port = htons(net_port);
if (inet_aton(hostname, &addr->sin_addr) != 1) {
struct hostent *hent;
retry:
hent = gethostbyname(hostname);
if (!hent) {
if (h_errno == TRY_AGAIN) {
usleep(100);
goto retry;
} else if (h_errno == NO_RECOVERY) {
fprintf(stderr, "gethostbyname(%s)"
"non-recoverable error encountered\n",
hostname);
} else {
/*
* HOST_NOT_FOUND, NO_ADDRESS or NO_DATA
*/
fprintf(stderr, "Host %s not found\n",
hostname);
}
return 1;
}
memcpy(&addr->sin_addr, hent->h_addr, 4);
memset(hostname, 0, sizeof(hostname));
strncpy(hostname, hent->h_name, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
}
return 0;
}
static int net_setup_client(void)
{
int fd;
struct sockaddr_in *addr = &hostname_addr;
fd = my_socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("client: socket");
return -1;
}
if (connect(fd, (struct sockaddr *)addr, sizeof(*addr)) < 0) {
if (errno == ECONNREFUSED)
fprintf(stderr,
"\nclient: Connection to %s refused, "
"perhaps the server is not started?\n\n",
hostname);
else
perror("client: connect");
close(fd);
return -1;
}
return fd;
}
static int open_client_connections(void)
{
int cpu;
cl_fds = calloc(ncpus, sizeof(*cl_fds));
for (cpu = 0; cpu < ncpus; cpu++) {
cl_fds[cpu] = net_setup_client();
if (cl_fds[cpu] < 0)
goto err;
}
return 0;
err:
while (cpu > 0)
close(cl_fds[cpu--]);
free(cl_fds);
return 1;
}
static void close_client_connections(void)
{
if (cl_fds) {
int cpu, *fdp;
for (cpu = 0, fdp = cl_fds; cpu < ncpus; cpu++, fdp++) {
if (*fdp >= 0) {
net_send_drops(*fdp);
net_close_connection(fdp);
}
}
free(cl_fds);
}
}
static void setup_buts(void)
{
struct list_head *p;
__list_for_each(p, &devpaths) {
struct blk_user_trace_setup buts;
struct devpath *dpp = list_entry(p, struct devpath, head);
memset(&buts, 0, sizeof(buts));
buts.buf_size = buf_size;
buts.buf_nr = buf_nr;
buts.act_mask = act_mask;
if (ioctl(dpp->fd, BLKTRACESETUP, &buts) >= 0) {
dpp->ncpus = ncpus;
dpp->buts_name = strdup(buts.name);
if (dpp->stats)
free(dpp->stats);
dpp->stats = calloc(dpp->ncpus, sizeof(*dpp->stats));
memset(dpp->stats, 0, dpp->ncpus * sizeof(*dpp->stats));
} else
fprintf(stderr, "BLKTRACESETUP(2) %s failed: %d/%s\n",
dpp->path, errno, strerror(errno));
}
}
static void start_buts(void)
{
struct list_head *p;
__list_for_each(p, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
if (ioctl(dpp->fd, BLKTRACESTART) < 0) {
fprintf(stderr, "BLKTRACESTART %s failed: %d/%s\n",
dpp->path, errno, strerror(errno));
}
}
}
static int get_drops(struct devpath *dpp)
{
int fd, drops = 0;
char fn[MAXPATHLEN + 64], tmp[256];
snprintf(fn, sizeof(fn), "%s/block/%s/dropped", debugfs_path,
dpp->buts_name);
fd = my_open(fn, O_RDONLY);
if (fd < 0) {
/*
* This may be ok: the kernel may not support
* dropped counts.
*/
if (errno != ENOENT)
fprintf(stderr, "Could not open %s: %d/%s\n",
fn, errno, strerror(errno));
return 0;
} else if (read(fd, tmp, sizeof(tmp)) < 0) {
fprintf(stderr, "Could not read %s: %d/%s\n",
fn, errno, strerror(errno));
} else
drops = atoi(tmp);
close(fd);
return drops;
}
static void get_all_drops(void)
{
struct list_head *p;
__list_for_each(p, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
dpp->drops = get_drops(dpp);
}
}
static inline struct trace_buf *alloc_trace_buf(int cpu, int bufsize)
{
struct trace_buf *tbp;
tbp = malloc(sizeof(*tbp) + bufsize);
INIT_LIST_HEAD(&tbp->head);
tbp->len = 0;
tbp->buf = (void *)(tbp + 1);
tbp->cpu = cpu;
tbp->dpp = NULL; /* Will be set when tbp is added */
return tbp;
}
static void free_tracer_heads(struct devpath *dpp)
{
int cpu;
struct tracer_devpath_head *hd;
for (cpu = 0, hd = dpp->heads; cpu < ncpus; cpu++, hd++) {
if (hd->prev)
free(hd->prev);
pthread_mutex_destroy(&hd->mutex);
}
free(dpp->heads);
}
static int setup_tracer_devpaths(void)
{
struct list_head *p;
if (net_client_use_send())
if (open_client_connections())
return 1;
__list_for_each(p, &devpaths) {
int cpu;
struct tracer_devpath_head *hd;
struct devpath *dpp = list_entry(p, struct devpath, head);
dpp->heads = calloc(ncpus, sizeof(struct tracer_devpath_head));
for (cpu = 0, hd = dpp->heads; cpu < ncpus; cpu++, hd++) {
INIT_LIST_HEAD(&hd->head);
pthread_mutex_init(&hd->mutex, NULL);
hd->prev = NULL;
}
}
return 0;
}
static inline void add_trace_buf(struct devpath *dpp, int cpu,
struct trace_buf **tbpp)
{
struct trace_buf *tbp = *tbpp;
struct tracer_devpath_head *hd = &dpp->heads[cpu];
tbp->dpp = dpp;
pthread_mutex_lock(&hd->mutex);
list_add_tail(&tbp->head, &hd->head);
pthread_mutex_unlock(&hd->mutex);
*tbpp = alloc_trace_buf(cpu, buf_size);
}
static inline void incr_entries(int entries_handled)
{
pthread_mutex_lock(&dp_mutex);
if (dp_entries == 0)
pthread_cond_signal(&dp_cond);
dp_entries += entries_handled;
pthread_mutex_unlock(&dp_mutex);
}
static void decr_entries(int handled)
{
pthread_mutex_lock(&dp_mutex);
dp_entries -= handled;
pthread_mutex_unlock(&dp_mutex);
}
static int wait_empty_entries(void)
{
pthread_mutex_lock(&dp_mutex);
while (!done && dp_entries == 0)
t_pthread_cond_wait(&dp_cond, &dp_mutex);
pthread_mutex_unlock(&dp_mutex);
return !done;
}
static int add_devpath(char *path)
{
int fd;
struct devpath *dpp;
struct list_head *p;
/*
* Verify device is not duplicated
*/
__list_for_each(p, &devpaths) {
struct devpath *tmp = list_entry(p, struct devpath, head);
if (!strcmp(tmp->path, path))
return 0;
}
/*
* Verify device is valid before going too far
*/
fd = my_open(path, O_RDONLY | O_NONBLOCK);
if (fd < 0) {
fprintf(stderr, "Invalid path %s specified: %d/%s\n",
path, errno, strerror(errno));
return 1;
}
dpp = malloc(sizeof(*dpp));
memset(dpp, 0, sizeof(*dpp));
dpp->path = strdup(path);
dpp->fd = fd;
ndevs++;
list_add_tail(&dpp->head, &devpaths);
return 0;
}
static void rel_devpaths(void)
{
struct list_head *p, *q;
list_for_each_safe(p, q, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
list_del(&dpp->head);
__stop_trace(dpp->fd);
close(dpp->fd);
if (dpp->heads)
free_tracer_heads(dpp);
dpp_free(dpp);
ndevs--;
}
}
static int flush_subbuf_net(struct trace_buf *tbp)
{
int fd = cl_fds[tbp->cpu];
struct devpath *dpp = tbp->dpp;
if (net_send_header(fd, tbp->cpu, dpp->buts_name, tbp->len))
return 1;
else if (net_send_data(fd, tbp->buf, tbp->len) != tbp->len)
return 1;
return 0;
}
static int
handle_list_net(__attribute__((__unused__))struct tracer_devpath_head *hd,
struct list_head *list)
{
struct trace_buf *tbp;
struct list_head *p, *q;
int entries_handled = 0;
list_for_each_safe(p, q, list) {
tbp = list_entry(p, struct trace_buf, head);
list_del(&tbp->head);
entries_handled++;
if (cl_fds[tbp->cpu] >= 0) {
if (flush_subbuf_net(tbp)) {
close(cl_fds[tbp->cpu]);
cl_fds[tbp->cpu] = -1;
}
}
free(tbp);
}
return entries_handled;
}
/*
* Tack 'tbp's buf onto the tail of 'prev's buf
*/
static struct trace_buf *tb_combine(struct trace_buf *prev,
struct trace_buf *tbp)
{
unsigned long tot_len;
tot_len = prev->len + tbp->len;
if (tot_len > buf_size) {
/*
* tbp->head isn't connected (it was 'prev'
* so it had been taken off of the list
* before). Therefore, we can realloc
* the whole structures, as the other fields
* are "static".
*/
prev = realloc(prev, sizeof(*prev) + tot_len);
prev->buf = (void *)(prev + 1);
}
memcpy(prev->buf + prev->len, tbp->buf, tbp->len);
prev->len = tot_len;
free(tbp);
return prev;
}
static int handle_list_file(struct tracer_devpath_head *hd,
struct list_head *list)
{
int off, t_len, nevents;
struct blk_io_trace *t;
struct list_head *p, *q;
int entries_handled = 0;
struct trace_buf *tbp, *prev;
prev = hd->prev;
list_for_each_safe(p, q, list) {
tbp = list_entry(p, struct trace_buf, head);
list_del(&tbp->head);
entries_handled++;
/*
* If there was some leftover before, tack this new
* entry onto the tail of the previous one.
*/
if (prev)
tbp = tb_combine(prev, tbp);
/*
* See how many whole traces there are - send them
* all out in one go.
*/
off = 0;
nevents = 0;
while (off + (int)sizeof(*t) <= tbp->len) {
t = (struct blk_io_trace *)(tbp->buf + off);
t_len = sizeof(*t) + t->pdu_len;
if (off + t_len > tbp->len)
break;
off += t_len;
nevents++;
}
if (nevents)
pdc_nev_update(tbp->dpp, tbp->cpu, nevents);
/*
* Write any full set of traces, any remaining data is kept
* for the next pass.
*/
if (off) {
if (write_data(tbp->buf, off) || off == tbp->len) {
free(tbp);
prev = NULL;
}
else {
/*
* Move valid data to beginning of buffer
*/
tbp->len -= off;
memmove(tbp->buf, tbp->buf + off, tbp->len);
prev = tbp;
}
} else
prev = tbp;
}
hd->prev = prev;
return entries_handled;
}
static void __process_trace_bufs(void)
{
int cpu;
struct list_head *p;
struct list_head list;
int handled = 0;
__list_for_each(p, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
struct tracer_devpath_head *hd = dpp->heads;
for (cpu = 0; cpu < ncpus; cpu++, hd++) {
pthread_mutex_lock(&hd->mutex);
if (list_empty(&hd->head)) {
pthread_mutex_unlock(&hd->mutex);
continue;
}
list_replace_init(&hd->head, &list);
pthread_mutex_unlock(&hd->mutex);
handled += handle_list(hd, &list);
}
}
if (handled)
decr_entries(handled);
}
static void process_trace_bufs(void)
{
while (wait_empty_entries())
__process_trace_bufs();
}
static void clean_trace_bufs(void)
{
/*
* No mutex needed here: we're only reading from the lists,
* tracers are done
*/
while (dp_entries)
__process_trace_bufs();
}
static inline void read_err(int cpu, char *ifn)
{
if (errno != EAGAIN)
fprintf(stderr, "Thread %d failed read of %s: %d/%s\n",
cpu, ifn, errno, strerror(errno));
}
static int net_sendfile(struct io_info *iop)
{
int ret;
ret = sendfile(iop->ofd, iop->ifd, NULL, iop->ready);
if (ret < 0) {
perror("sendfile");
return 1;
} else if (ret < (int)iop->ready) {
fprintf(stderr, "short sendfile send (%d of %d)\n",
ret, iop->ready);
return 1;
}
return 0;
}
static inline int net_sendfile_data(struct tracer *tp, struct io_info *iop)
{
struct devpath *dpp = iop->dpp;
if (net_send_header(iop->ofd, tp->cpu, dpp->buts_name, iop->ready))
return 1;
return net_sendfile(iop);
}
static int fill_ofname(struct io_info *iop, int cpu)
{
int len;
struct stat sb;
char *dst = iop->ofn;
if (output_dir)
len = snprintf(iop->ofn, sizeof(iop->ofn), "%s/", output_dir);
else
len = snprintf(iop->ofn, sizeof(iop->ofn), "./");
if (net_mode == Net_server) {
struct cl_conn *nc = iop->nc;
len += sprintf(dst + len, "%s-", nc->ch->hostname);
len += strftime(dst + len, 64, "%F-%T/",
gmtime(&iop->dpp->cl_connect_time));
}
if (stat(iop->ofn, &sb) < 0) {
if (errno != ENOENT) {
fprintf(stderr,
"Destination dir %s stat failed: %d/%s\n",
iop->ofn, errno, strerror(errno));
return 1;
}
/*
* There is no synchronization between multiple threads
* trying to create the directory at once. It's harmless
* to let them try, so just detect the problem and move on.
*/
if (mkdir(iop->ofn, 0755) < 0 && errno != EEXIST) {
fprintf(stderr,
"Destination dir %s can't be made: %d/%s\n",
iop->ofn, errno, strerror(errno));
return 1;
}
}
if (output_name)
snprintf(iop->ofn + len, sizeof(iop->ofn), "%s.blktrace.%d",
output_name, cpu);
else
snprintf(iop->ofn + len, sizeof(iop->ofn), "%s.blktrace.%d",
iop->dpp->buts_name, cpu);
return 0;
}
static int set_vbuf(struct io_info *iop, int mode, size_t size)
{
iop->obuf = malloc(size);
if (setvbuf(iop->ofp, iop->obuf, mode, size) < 0) {
fprintf(stderr, "setvbuf(%s, %d) failed: %d/%s\n",
iop->dpp->path, (int)size, errno,
strerror(errno));
free(iop->obuf);
return 1;
}
return 0;
}
static int iop_open(struct io_info *iop, int cpu)
{
iop->ofd = -1;
if (fill_ofname(iop, cpu))
return 1;
iop->ofp = my_fopen(iop->ofn, "w+");
if (iop->ofp == NULL) {
fprintf(stderr, "Open output file %s failed: %d/%s\n",
iop->ofn, errno, strerror(errno));
return 1;
}
if (set_vbuf(iop, _IOLBF, FILE_VBUF_SIZE)) {
fprintf(stderr, "set_vbuf for file %s failed: %d/%s\n",
iop->ofn, errno, strerror(errno));
fclose(iop->ofp);
return 1;
}
iop->ofd = fileno(iop->ofp);
return 0;
}
static void close_iop(struct io_info *iop)
{
struct mmap_info *mip = &iop->mmap_info;
if (mip->fs_buf)
munmap(mip->fs_buf, mip->fs_buf_len);
if (!piped_output) {
if (ftruncate(fileno(iop->ofp), mip->fs_size) < 0) {
fprintf(stderr,
"Ignoring err: ftruncate(%s): %d/%s\n",
iop->ofn, errno, strerror(errno));
}
}
if (iop->ofp)
fclose(iop->ofp);
if (iop->obuf)
free(iop->obuf);
}
static void close_ios(struct tracer *tp)
{
while (tp->nios > 0) {
struct io_info *iop = &tp->ios[--tp->nios];
iop->dpp->drops = get_drops(iop->dpp);
if (iop->ifd >= 0)
close(iop->ifd);
if (iop->ofp)
close_iop(iop);
else if (iop->ofd >= 0) {
struct devpath *dpp = iop->dpp;
net_send_close(iop->ofd, dpp->buts_name, dpp->drops);
net_close_connection(&iop->ofd);
}
}
free(tp->ios);
free(tp->pfds);
}
static int open_ios(struct tracer *tp)
{
struct pollfd *pfd;
struct io_info *iop;
struct list_head *p;
tp->ios = calloc(ndevs, sizeof(struct io_info));
memset(tp->ios, 0, ndevs * sizeof(struct io_info));
tp->pfds = calloc(ndevs, sizeof(struct pollfd));
memset(tp->pfds, 0, ndevs * sizeof(struct pollfd));
tp->nios = 0;
iop = tp->ios;
pfd = tp->pfds;
__list_for_each(p, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
iop->dpp = dpp;
iop->ofd = -1;
snprintf(iop->ifn, sizeof(iop->ifn), "%s/block/%s/trace%d",
debugfs_path, dpp->buts_name, tp->cpu);
iop->ifd = my_open(iop->ifn, O_RDONLY | O_NONBLOCK);
if (iop->ifd < 0) {
fprintf(stderr, "Thread %d failed open %s: %d/%s\n",
tp->cpu, iop->ifn, errno, strerror(errno));
return 1;
}
init_mmap_info(&iop->mmap_info);
pfd->fd = iop->ifd;
pfd->events = POLLIN;
if (piped_output)
;
else if (net_client_use_sendfile()) {
iop->ofd = net_setup_client();
if (iop->ofd < 0)
goto err;
net_send_open(iop->ofd, tp->cpu, dpp->buts_name);
} else if (net_mode == Net_none) {
if (iop_open(iop, tp->cpu))
goto err;
} else {
/*
* This ensures that the server knows about all
* connections & devices before _any_ closes
*/
net_send_open(cl_fds[tp->cpu], tp->cpu, dpp->buts_name);
}
pfd++;
iop++;
tp->nios++;
}
return 0;
err:
close(iop->ifd); /* tp->nios _not_ bumped */
close_ios(tp);
return 1;
}
static int handle_pfds_file(struct tracer *tp, int nevs, int force_read)
{
struct mmap_info *mip;
int i, ret, nentries = 0;
struct pollfd *pfd = tp->pfds;
struct io_info *iop = tp->ios;
for (i = 0; nevs > 0 && i < ndevs; i++, pfd++, iop++) {
if (pfd->revents & POLLIN || force_read) {
mip = &iop->mmap_info;
ret = setup_mmap(iop->ofd, buf_size, mip, tp);
if (ret < 0) {
pfd->events = 0;
break;
}
ret = read(iop->ifd, mip->fs_buf + mip->fs_off,
buf_size);
if (ret > 0) {
pdc_dr_update(iop->dpp, tp->cpu, ret);
mip->fs_size += ret;
mip->fs_off += ret;
nentries++;
} else if (ret == 0) {
/*
* Short reads after we're done stop us
* from trying reads.
*/
if (tp->is_done)
clear_events(pfd);
} else {
read_err(tp->cpu, iop->ifn);
if (errno != EAGAIN || tp->is_done)
clear_events(pfd);
}
nevs--;
}
}
return nentries;
}
static int handle_pfds_netclient(struct tracer *tp, int nevs, int force_read)
{
struct stat sb;
int i, nentries = 0;
struct pollfd *pfd = tp->pfds;
struct io_info *iop = tp->ios;
for (i = 0; i < ndevs; i++, pfd++, iop++) {
if (pfd->revents & POLLIN || force_read) {
if (fstat(iop->ifd, &sb) < 0) {
perror(iop->ifn);
pfd->events = 0;
} else if (sb.st_size > (off_t)iop->data_queued) {
iop->ready = sb.st_size - iop->data_queued;
iop->data_queued = sb.st_size;
if (!net_sendfile_data(tp, iop)) {
pdc_dr_update(iop->dpp, tp->cpu,
iop->ready);
nentries++;
} else
clear_events(pfd);
}
if (--nevs == 0)
break;
}
}
if (nentries)
incr_entries(nentries);
return nentries;
}
static int handle_pfds_entries(struct tracer *tp, int nevs, int force_read)
{
int i, nentries = 0;
struct trace_buf *tbp;
struct pollfd *pfd = tp->pfds;
struct io_info *iop = tp->ios;
tbp = alloc_trace_buf(tp->cpu, buf_size);
for (i = 0; i < ndevs; i++, pfd++, iop++) {
if (pfd->revents & POLLIN || force_read) {
tbp->len = read(iop->ifd, tbp->buf, buf_size);
if (tbp->len > 0) {
pdc_dr_update(iop->dpp, tp->cpu, tbp->len);
add_trace_buf(iop->dpp, tp->cpu, &tbp);
nentries++;
} else if (tbp->len == 0) {
/*
* Short reads after we're done stop us
* from trying reads.
*/
if (tp->is_done)
clear_events(pfd);
} else {
read_err(tp->cpu, iop->ifn);
if (errno != EAGAIN || tp->is_done)
clear_events(pfd);
}
if (!piped_output && --nevs == 0)
break;
}
}
free(tbp);
if (nentries)
incr_entries(nentries);
return nentries;
}
static void *thread_main(void *arg)
{
int ret, ndone, to_val;
struct tracer *tp = arg;
ret = lock_on_cpu(tp->cpu);
if (ret)
goto err;
ret = open_ios(tp);
if (ret)
goto err;
if (piped_output)
to_val = 50; /* Frequent partial handles */
else
to_val = 500; /* 1/2 second intervals */
tracer_signal_ready(tp, Th_running, 0);
tracer_wait_unblock(tp);
while (!tp->is_done) {
ndone = poll(tp->pfds, ndevs, to_val);
if (ndone || piped_output)
(void)handle_pfds(tp, ndone, piped_output);
else if (ndone < 0 && errno != EINTR)
fprintf(stderr, "Thread %d poll failed: %d/%s\n",
tp->cpu, errno, strerror(errno));
}
/*
* Trace is stopped, pull data until we get a short read
*/
while (handle_pfds(tp, ndevs, 1) > 0)
;
close_ios(tp);
tracer_signal_ready(tp, Th_leaving, 0);
return NULL;
err:
tracer_signal_ready(tp, Th_error, ret);
return NULL;
}
static int start_tracer(int cpu)
{
struct tracer *tp;
tp = malloc(sizeof(*tp));
memset(tp, 0, sizeof(*tp));
INIT_LIST_HEAD(&tp->head);
tp->status = 0;
tp->cpu = cpu;
if (pthread_create(&tp->thread, NULL, thread_main, tp)) {
fprintf(stderr, "FAILED to start thread on CPU %d: %d/%s\n",
cpu, errno, strerror(errno));
free(tp);
return 1;
}
list_add_tail(&tp->head, &tracers);
return 0;
}
static void start_tracers(void)
{
int cpu;
struct list_head *p;
for (cpu = 0; cpu < ncpus; cpu++)
if (start_tracer(cpu))
break;
wait_tracers_ready(cpu);
__list_for_each(p, &tracers) {
struct tracer *tp = list_entry(p, struct tracer, head);
if (tp->status)
fprintf(stderr,
"FAILED to start thread on CPU %d: %d/%s\n",
tp->cpu, tp->status, strerror(tp->status));
}
}
static void stop_tracers(void)
{
struct list_head *p;
/*
* Stop the tracing - makes the tracer threads clean up quicker.
*/
__list_for_each(p, &devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
(void)ioctl(dpp->fd, BLKTRACESTOP);
}
/*
* Tell each tracer to quit
*/
__list_for_each(p, &tracers) {
struct tracer *tp = list_entry(p, struct tracer, head);
tp->is_done = 1;
}
pthread_cond_broadcast(&mt_cond);
}
static void del_tracers(void)
{
struct list_head *p, *q;
list_for_each_safe(p, q, &tracers) {
struct tracer *tp = list_entry(p, struct tracer, head);
list_del(&tp->head);
free(tp);
}
}
static void wait_tracers(void)
{
struct list_head *p;
if (use_tracer_devpaths())
process_trace_bufs();
wait_tracers_leaving();
__list_for_each(p, &tracers) {
int ret;
struct tracer *tp = list_entry(p, struct tracer, head);
ret = pthread_join(tp->thread, NULL);
if (ret)
fprintf(stderr, "Thread join %d failed %d\n",
tp->cpu, ret);
}
if (use_tracer_devpaths())
clean_trace_bufs();
get_all_drops();
}
static void exit_tracing(void)
{
signal(SIGINT, SIG_IGN);
signal(SIGHUP, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGALRM, SIG_IGN);
stop_tracers();
wait_tracers();
del_tracers();
rel_devpaths();
}
static void handle_sigint(__attribute__((__unused__)) int sig)
{
done = 1;
stop_tracers();
}
static void show_stats(struct list_head *devpaths)
{
FILE *ofp;
struct list_head *p;
unsigned long long nevents, data_read;
unsigned long long total_drops = 0;
unsigned long long total_events = 0;
if (piped_output)
ofp = my_fopen("/dev/null", "w");
else
ofp = stdout;
__list_for_each(p, devpaths) {
int cpu;
struct pdc_stats *sp;
struct devpath *dpp = list_entry(p, struct devpath, head);
if (net_mode == Net_server)
printf("server: end of run for %s:%s\n",
dpp->ch->hostname, dpp->buts_name);
data_read = 0;
nevents = 0;
fprintf(ofp, "=== %s ===\n", dpp->buts_name);
for (cpu = 0, sp = dpp->stats; cpu < dpp->ncpus; cpu++, sp++) {
/*
* Estimate events if not known...
*/
if (sp->nevents == 0) {
sp->nevents = sp->data_read /
sizeof(struct blk_io_trace);
}
fprintf(ofp,
" CPU%3d: %20llu events, %8llu KiB data\n",
cpu, sp->nevents, (sp->data_read + 1023) >> 10);
data_read += sp->data_read;
nevents += sp->nevents;
}
fprintf(ofp, " Total: %20llu events (dropped %llu),"
" %8llu KiB data\n", nevents,
dpp->drops, (data_read + 1024) >> 10);
total_drops += dpp->drops;
total_events += (nevents + dpp->drops);
}
fflush(ofp);
if (piped_output)
fclose(ofp);
if (total_drops) {
double drops_ratio = 1.0;
if (total_events)
drops_ratio = (double)total_drops/(double)total_events;
fprintf(stderr, "\nYou have %llu (%5.1lf%%) dropped events\n"
"Consider using a larger buffer size (-b) "
"and/or more buffers (-n)\n",
total_drops, 100.0 * drops_ratio);
}
}
static int handle_args(int argc, char *argv[])
{
int c, i;
struct statfs st;
int act_mask_tmp = 0;
while ((c = getopt_long(argc, argv, S_OPTS, l_opts, NULL)) >= 0) {
switch (c) {
case 'a':
i = find_mask_map(optarg);
if (i < 0) {
fprintf(stderr, "Invalid action mask %s\n",
optarg);
return 1;
}
act_mask_tmp |= i;
break;
case 'A':
if ((sscanf(optarg, "%x", &i) != 1) ||
!valid_act_opt(i)) {
fprintf(stderr,
"Invalid set action mask %s/0x%x\n",
optarg, i);
return 1;
}
act_mask_tmp = i;
break;
case 'd':
if (add_devpath(optarg) != 0)
return 1;
break;
case 'I': {
char dev_line[256];
FILE *ifp = my_fopen(optarg, "r");
if (!ifp) {
fprintf(stderr,
"Invalid file for devices %s\n",
optarg);
return 1;
}
while (fscanf(ifp, "%s\n", dev_line) == 1) {
if (add_devpath(dev_line) != 0) {
fclose(ifp);
return 1;
}
}
fclose(ifp);
break;
}
case 'r':
debugfs_path = optarg;
break;
case 'o':
output_name = optarg;
break;
case 'k':
kill_running_trace = 1;
break;
case 'w':
stop_watch = atoi(optarg);
if (stop_watch <= 0) {
fprintf(stderr,
"Invalid stopwatch value (%d secs)\n",
stop_watch);
return 1;
}
break;
case 'V':
case 'v':
printf("%s version %s\n", argv[0], blktrace_version);
exit(0);
/*NOTREACHED*/
case 'b':
buf_size = strtoul(optarg, NULL, 10);
if (buf_size <= 0 || buf_size > 16*1024) {
fprintf(stderr, "Invalid buffer size (%lu)\n",
buf_size);
return 1;
}
buf_size <<= 10;
break;
case 'n':
buf_nr = strtoul(optarg, NULL, 10);
if (buf_nr <= 0) {
fprintf(stderr,
"Invalid buffer nr (%lu)\n", buf_nr);
return 1;
}
break;
case 'D':
output_dir = optarg;
break;
case 'h':
net_mode = Net_client;
memset(hostname, 0, sizeof(hostname));
strncpy(hostname, optarg, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
break;
case 'l':
net_mode = Net_server;
break;
case 'p':
net_port = atoi(optarg);
break;
case 's':
net_use_sendfile = 0;
break;
default:
show_usage(argv[0]);
exit(1);
/*NOTREACHED*/
}
}
while (optind < argc)
if (add_devpath(argv[optind++]) != 0)
return 1;
if (net_mode != Net_server && ndevs == 0) {
show_usage(argv[0]);
return 1;
}
if (statfs(debugfs_path, &st) < 0) {
fprintf(stderr, "Invalid debug path %s: %d/%s\n",
debugfs_path, errno, strerror(errno));
return 1;
}
if (st.f_type != (long)DEBUGFS_TYPE) {
fprintf(stderr, "Debugfs is not mounted at %s\n", debugfs_path);
return 1;
}
if (act_mask_tmp != 0)
act_mask = act_mask_tmp;
if (net_mode == Net_client && net_setup_addr())
return 1;
/*
* Set up for appropriate PFD handler based upon output name.
*/
if (net_client_use_sendfile())
handle_pfds = handle_pfds_netclient;
else if (net_client_use_send())
handle_pfds = handle_pfds_entries;
else if (output_name && (strcmp(output_name, "-") == 0)) {
piped_output = 1;
handle_pfds = handle_pfds_entries;
pfp = stdout;
if (setvbuf(pfp, NULL, _IONBF, 0)) {
perror("setvbuf stdout");
return 1;
}
} else
handle_pfds = handle_pfds_file;
return 0;
}
static void ch_add_connection(struct net_server_s *ns, struct cl_host *ch,
int fd)
{
struct cl_conn *nc;
nc = malloc(sizeof(*nc));
memset(nc, 0, sizeof(*nc));
time(&nc->connect_time);
nc->ch = ch;
nc->fd = fd;
nc->ncpus = -1;
list_add_tail(&nc->ch_head, &ch->conn_list);
ch->connects++;
list_add_tail(&nc->ns_head, &ns->conn_list);
ns->connects++;
ns->pfds = realloc(ns->pfds, (ns->connects+1) * sizeof(struct pollfd));
}
static void ch_rem_connection(struct net_server_s *ns, struct cl_host *ch,
struct cl_conn *nc)
{
net_close_connection(&nc->fd);
list_del(&nc->ch_head);
ch->connects--;
list_del(&nc->ns_head);
ns->connects--;
ns->pfds = realloc(ns->pfds, (ns->connects+1) * sizeof(struct pollfd));
free(nc);
}
static struct cl_host *net_find_client_host(struct net_server_s *ns,
struct in_addr cl_in_addr)
{
struct list_head *p;
__list_for_each(p, &ns->ch_list) {
struct cl_host *ch = list_entry(p, struct cl_host, head);
if (in_addr_eq(ch->cl_in_addr, cl_in_addr))
return ch;
}
return NULL;
}
static struct cl_host *net_add_client_host(struct net_server_s *ns,
struct sockaddr_in *addr)
{
struct cl_host *ch;
ch = malloc(sizeof(*ch));
memset(ch, 0, sizeof(*ch));
ch->ns = ns;
ch->cl_in_addr = addr->sin_addr;
list_add_tail(&ch->head, &ns->ch_list);
ns->nchs++;
ch->hostname = strdup(inet_ntoa(addr->sin_addr));
printf("server: connection from %s\n", ch->hostname);
INIT_LIST_HEAD(&ch->conn_list);
INIT_LIST_HEAD(&ch->devpaths);
return ch;
}
static void device_done(struct devpath *dpp, int ncpus)
{
int cpu;
struct io_info *iop;
for (cpu = 0, iop = dpp->ios; cpu < ncpus; cpu++, iop++)
close_iop(iop);
list_del(&dpp->head);
dpp_free(dpp);
}
static void net_ch_remove(struct cl_host *ch, int ncpus)
{
struct list_head *p, *q;
struct net_server_s *ns = ch->ns;
list_for_each_safe(p, q, &ch->devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
device_done(dpp, ncpus);
}
list_for_each_safe(p, q, &ch->conn_list) {
struct cl_conn *nc = list_entry(p, struct cl_conn, ch_head);
ch_rem_connection(ns, ch, nc);
}
list_del(&ch->head);
ns->nchs--;
if (ch->hostname)
free(ch->hostname);
free(ch);
}
static void net_add_connection(struct net_server_s *ns)
{
int fd;
struct cl_host *ch;
socklen_t socklen = sizeof(ns->addr);
fd = my_accept(ns->listen_fd, (struct sockaddr *)&ns->addr, &socklen);
if (fd < 0) {
/*
* This is OK: we just won't accept this connection,
* nothing fatal.
*/
perror("accept");
} else {
ch = net_find_client_host(ns, ns->addr.sin_addr);
if (!ch)
ch = net_add_client_host(ns, &ns->addr);
ch_add_connection(ns, ch, fd);
}
}
static struct devpath *nc_add_dpp(struct cl_conn *nc,
struct blktrace_net_hdr *bnh,
time_t connect_time)
{
int cpu;
struct io_info *iop;
struct devpath *dpp;
dpp = malloc(sizeof(*dpp));
memset(dpp, 0, sizeof(*dpp));
dpp->buts_name = strdup(bnh->buts_name);
dpp->path = strdup(bnh->buts_name);
dpp->fd = -1;
dpp->ch = nc->ch;
dpp->cl_id = bnh->cl_id;
dpp->cl_connect_time = connect_time;
dpp->ncpus = nc->ncpus;
dpp->stats = calloc(dpp->ncpus, sizeof(*dpp->stats));
memset(dpp->stats, 0, dpp->ncpus * sizeof(*dpp->stats));
list_add_tail(&dpp->head, &nc->ch->devpaths);
nc->ch->ndevs++;
dpp->ios = calloc(nc->ncpus, sizeof(*iop));
memset(dpp->ios, 0, ndevs * sizeof(*iop));
for (cpu = 0, iop = dpp->ios; cpu < nc->ncpus; cpu++, iop++) {
iop->dpp = dpp;
iop->nc = nc;
init_mmap_info(&iop->mmap_info);
if (iop_open(iop, cpu))
goto err;
}
return dpp;
err:
/*
* Need to unravel what's been done...
*/
while (cpu >= 0)
close_iop(&dpp->ios[cpu--]);
dpp_free(dpp);
return NULL;
}
static struct devpath *nc_find_dpp(struct cl_conn *nc,
struct blktrace_net_hdr *bnh)
{
struct list_head *p;
time_t connect_time = nc->connect_time;
__list_for_each(p, &nc->ch->devpaths) {
struct devpath *dpp = list_entry(p, struct devpath, head);
if (!strcmp(dpp->buts_name, bnh->buts_name))
return dpp;
if (dpp->cl_id == bnh->cl_id)
connect_time = dpp->cl_connect_time;
}
return nc_add_dpp(nc, bnh, connect_time);
}
static void net_client_read_data(struct cl_conn *nc, struct devpath *dpp,
struct blktrace_net_hdr *bnh)
{
int ret;
struct io_info *iop = &dpp->ios[bnh->cpu];
struct mmap_info *mip = &iop->mmap_info;
if (setup_mmap(iop->ofd, bnh->len, &iop->mmap_info, NULL)) {
fprintf(stderr, "ncd(%s:%d): mmap failed\n",
nc->ch->hostname, nc->fd);
exit(1);
}
ret = net_recv_data(nc->fd, mip->fs_buf + mip->fs_off, bnh->len);
if (ret > 0) {
pdc_dr_update(dpp, bnh->cpu, ret);
mip->fs_size += ret;
mip->fs_off += ret;
} else if (ret < 0)
exit(1);
}
/*
* Returns 1 if we closed a host - invalidates other polling information
* that may be present.
*/
static int net_client_data(struct cl_conn *nc)
{
int ret;
struct devpath *dpp;
struct blktrace_net_hdr bnh;
ret = net_get_header(nc, &bnh);
if (ret == 0)
return 0;
if (ret < 0) {
fprintf(stderr, "ncd(%d): header read failed\n", nc->fd);
exit(1);
}
if (data_is_native == -1 && check_data_endianness(bnh.magic)) {
fprintf(stderr, "ncd(%d): received data is bad\n", nc->fd);
exit(1);
}
if (!data_is_native) {
bnh.magic = be32_to_cpu(bnh.magic);
bnh.cpu = be32_to_cpu(bnh.cpu);
bnh.max_cpus = be32_to_cpu(bnh.max_cpus);
bnh.len = be32_to_cpu(bnh.len);
bnh.cl_id = be32_to_cpu(bnh.cl_id);
bnh.buf_size = be32_to_cpu(bnh.buf_size);
bnh.buf_nr = be32_to_cpu(bnh.buf_nr);
bnh.page_size = be32_to_cpu(bnh.page_size);
}
if ((bnh.magic & 0xffffff00) != BLK_IO_TRACE_MAGIC) {
fprintf(stderr, "ncd(%s:%d): bad data magic\n",
nc->ch->hostname, nc->fd);
exit(1);
}
if (nc->ncpus == -1)
nc->ncpus = bnh.max_cpus;
/*
* len == 0 means the other end is sending us a new connection/dpp
* len == 1 means that the other end signalled end-of-run
*/
dpp = nc_find_dpp(nc, &bnh);
if (bnh.len == 0) {
/*
* Just adding in the dpp above is enough
*/
ack_open_close(nc->fd, dpp->buts_name);
nc->ch->cl_opens++;
} else if (bnh.len == 1) {
/*
* overload cpu count with dropped events
*/
dpp->drops = bnh.cpu;
ack_open_close(nc->fd, dpp->buts_name);
if (--nc->ch->cl_opens == 0) {
show_stats(&nc->ch->devpaths);
net_ch_remove(nc->ch, nc->ncpus);
return 1;
}
} else
net_client_read_data(nc, dpp, &bnh);
return 0;
}
static void handle_client_data(struct net_server_s *ns, int events)
{
struct cl_conn *nc;
struct pollfd *pfd;
struct list_head *p, *q;
pfd = &ns->pfds[1];
list_for_each_safe(p, q, &ns->conn_list) {
if (pfd->revents & POLLIN) {
nc = list_entry(p, struct cl_conn, ns_head);
if (net_client_data(nc) || --events == 0)
break;
}
pfd++;
}
}
static void net_setup_pfds(struct net_server_s *ns)
{
struct pollfd *pfd;
struct list_head *p;
ns->pfds[0].fd = ns->listen_fd;
ns->pfds[0].events = POLLIN;
pfd = &ns->pfds[1];
__list_for_each(p, &ns->conn_list) {
struct cl_conn *nc = list_entry(p, struct cl_conn, ns_head);
pfd->fd = nc->fd;
pfd->events = POLLIN;
pfd++;
}
}
static int net_server_handle_connections(struct net_server_s *ns)
{
int events;
printf("server: waiting for connections...\n");
while (!done) {
net_setup_pfds(ns);
events = poll(ns->pfds, ns->connects + 1, -1);
if (events < 0) {
if (errno != EINTR) {
perror("FATAL: poll error");
return 1;
}
} else if (events > 0) {
if (ns->pfds[0].revents & POLLIN) {
net_add_connection(ns);
events--;
}
if (events)
handle_client_data(ns, events);
}
}
return 0;
}
static int net_server(void)
{
int fd, opt;
int ret = 1;
struct net_server_s net_server;
struct net_server_s *ns = &net_server;
memset(ns, 0, sizeof(*ns));
INIT_LIST_HEAD(&ns->ch_list);
INIT_LIST_HEAD(&ns->conn_list);
ns->pfds = malloc(sizeof(struct pollfd));
fd = my_socket(AF_INET, SOCK_STREAM, 0);
if (fd < 0) {
perror("server: socket");
goto out;
}
opt = 1;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0) {
perror("setsockopt");
goto out;
}
memset(&ns->addr, 0, sizeof(ns->addr));
ns->addr.sin_family = AF_INET;
ns->addr.sin_addr.s_addr = htonl(INADDR_ANY);
ns->addr.sin_port = htons(net_port);
if (bind(fd, (struct sockaddr *) &ns->addr, sizeof(ns->addr)) < 0) {
perror("bind");
goto out;
}
if (listen(fd, 1) < 0) {
perror("listen");
goto out;
}
/*
* The actual server looping is done here:
*/
ns->listen_fd = fd;
ret = net_server_handle_connections(ns);
/*
* Clean up and return...
*/
out:
free(ns->pfds);
return ret;
}
static int run_tracers(void)
{
atexit(exit_tracing);
if (net_mode == Net_client)
printf("blktrace: connecting to %s\n", hostname);
setup_buts();
if (use_tracer_devpaths()) {
if (setup_tracer_devpaths())
return 1;
if (piped_output)
handle_list = handle_list_file;
else
handle_list = handle_list_net;
}
start_tracers();
if (nthreads_running == ncpus) {
unblock_tracers();
start_buts();
if (net_mode == Net_client)
printf("blktrace: connected!\n");
if (stop_watch)
alarm(stop_watch);
} else
stop_tracers();
wait_tracers();
if (nthreads_running == ncpus)
show_stats(&devpaths);
if (net_client_use_send())
close_client_connections();
del_tracers();
return 0;
}
int main(int argc, char *argv[])
{
int ret = 0;
setlocale(LC_NUMERIC, "en_US");
pagesize = getpagesize();
ncpus = sysconf(_SC_NPROCESSORS_ONLN);
if (ncpus < 0) {
fprintf(stderr, "sysconf(_SC_NPROCESSORS_ONLN) failed %d/%s\n",
errno, strerror(errno));
ret = 1;
goto out;
} else if (handle_args(argc, argv)) {
ret = 1;
goto out;
}
if (ndevs > 1 && output_name && strcmp(output_name, "-") != 0) {
fprintf(stderr, "-o not supported with multiple devices\n");
ret = 1;
goto out;
}
signal(SIGINT, handle_sigint);
signal(SIGHUP, handle_sigint);
signal(SIGTERM, handle_sigint);
signal(SIGALRM, handle_sigint);
signal(SIGPIPE, SIG_IGN);
if (kill_running_trace) {
struct devpath *dpp;
struct list_head *p;
__list_for_each(p, &devpaths) {
dpp = list_entry(p, struct devpath, head);
if (__stop_trace(dpp->fd)) {
fprintf(stderr,
"BLKTRACETEARDOWN %s failed: %d/%s\n",
dpp->path, errno, strerror(errno));
}
}
} else if (net_mode == Net_server) {
if (output_name) {
fprintf(stderr, "-o ignored in server mode\n");
output_name = NULL;
}
ret = net_server();
} else
ret = run_tracers();
out:
if (pfp)
fclose(pfp);
rel_devpaths();
return ret;
}