| /* |
| * readprofile.c - used to read /proc/profile |
| * |
| * Copyright (C) 1994,1996 Alessandro Rubini (rubini@ipvvis.unipv.it) |
| * |
| * 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., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| /* |
| * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
| * - added Native Language Support |
| * 1999-09-01 Stephane Eranian <eranian@cello.hpl.hp.com> |
| * - 64bit clean patch |
| * 3Feb2001 Andrew Morton <andrewm@uow.edu.au> |
| * - -M option to write profile multiplier. |
| * 2001-11-07 Werner Almesberger <wa@almesberger.net> |
| * - byte order auto-detection and -n option |
| * 2001-11-09 Werner Almesberger <wa@almesberger.net> |
| * - skip step size (index 0) |
| * 2002-03-09 John Levon <moz@compsoc.man.ac.uk> |
| * - make maplineno do something |
| * 2002-11-28 Mads Martin Joergensen + |
| * - also try /boot/System.map-`uname -r` |
| * 2003-04-09 Werner Almesberger <wa@almesberger.net> |
| * - fixed off-by eight error and improved heuristics in byte order detection |
| * 2003-08-12 Nikita Danilov <Nikita@Namesys.COM> |
| * - added -s option; example of use: |
| * "readprofile -s -m /boot/System.map-test | grep __d_lookup | sort -n -k3" |
| */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <getopt.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <sys/utsname.h> |
| #include <unistd.h> |
| |
| #include "nls.h" |
| #include "xalloc.h" |
| #include "closestream.h" |
| |
| #define S_LEN 128 |
| |
| /* These are the defaults */ |
| static char defaultmap[]="/boot/System.map"; |
| static char defaultpro[]="/proc/profile"; |
| |
| static FILE *myopen(char *name, char *mode, int *flag) |
| { |
| int len = strlen(name); |
| |
| if (!strcmp(name + len - 3, ".gz")) { |
| FILE *res; |
| char *cmdline = xmalloc(len + 6); |
| sprintf(cmdline, "zcat %s", name); |
| res = popen(cmdline, mode); |
| free(cmdline); |
| *flag = 1; |
| return res; |
| } |
| *flag = 0; |
| return fopen(name, mode); |
| } |
| |
| #ifndef BOOT_SYSTEM_MAP |
| #define BOOT_SYSTEM_MAP "/boot/System.map-" |
| #endif |
| |
| static char *boot_uname_r_str(void) |
| { |
| struct utsname uname_info; |
| char *s; |
| size_t len; |
| |
| if (uname(&uname_info)) |
| return ""; |
| len = strlen(BOOT_SYSTEM_MAP) + strlen(uname_info.release) + 1; |
| s = xmalloc(len); |
| strcpy(s, BOOT_SYSTEM_MAP); |
| strcat(s, uname_info.release); |
| return s; |
| } |
| |
| static void __attribute__ ((__noreturn__)) |
| usage(FILE * out) |
| { |
| fputs(USAGE_HEADER, out); |
| fprintf(out, _(" %s [options]\n"), program_invocation_short_name); |
| |
| fputs(USAGE_SEPARATOR, out); |
| fputs(_("Display kernel profiling information.\n"), out); |
| |
| fputs(USAGE_OPTIONS, out); |
| fprintf(out, |
| _(" -m, --mapfile <mapfile> (defaults: \"%s\" and\n"), defaultmap); |
| fprintf(out, |
| _(" \"%s\")\n"), boot_uname_r_str()); |
| fprintf(out, |
| _(" -p, --profile <pro-file> (default: \"%s\")\n"), defaultpro); |
| fputs(_(" -M, --multiplier <mult> set the profiling multiplier to <mult>\n"), out); |
| fputs(_(" -i, --info print only info about the sampling step\n"), out); |
| fputs(_(" -v, --verbose print verbose data\n"), out); |
| fputs(_(" -a, --all print all symbols, even if count is 0\n"), out); |
| fputs(_(" -b, --histbin print individual histogram-bin counts\n"), out); |
| fputs(_(" -s, --counters print individual counters within functions\n"), out); |
| fputs(_(" -r, --reset reset all the counters (root only)\n"), out); |
| fputs(_(" -n, --no-auto disable byte order auto-detection\n"), out); |
| fputs(USAGE_SEPARATOR, out); |
| fputs(USAGE_HELP, out); |
| fputs(USAGE_VERSION, out); |
| fprintf(out, USAGE_MAN_TAIL("readprofile(8)")); |
| exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| FILE *map; |
| int proFd; |
| char *mapFile, *proFile, *mult = NULL; |
| size_t len = 0, indx = 1; |
| unsigned long long add0 = 0; |
| unsigned int step; |
| unsigned int *buf, total, fn_len; |
| unsigned long long fn_add, next_add; /* current and next address */ |
| char fn_name[S_LEN], next_name[S_LEN]; /* current and next name */ |
| char mode[8]; |
| int c; |
| ssize_t rc; |
| int optAll = 0, optInfo = 0, optReset = 0, optVerbose = 0, optNative = 0; |
| int optBins = 0, optSub = 0; |
| char mapline[S_LEN]; |
| int maplineno = 1; |
| int popenMap; /* flag to tell if popen() has been used */ |
| int header_printed; |
| |
| static const struct option longopts[] = { |
| {"mapfile", required_argument, NULL, 'm'}, |
| {"profile", required_argument, NULL, 'p'}, |
| {"multiplier", required_argument, NULL, 'M'}, |
| {"info", no_argument, NULL, 'i'}, |
| {"verbose", no_argument, NULL, 'v'}, |
| {"all", no_argument, NULL, 'a'}, |
| {"histbin", no_argument, NULL, 'b'}, |
| {"counters", no_argument, NULL, 's'}, |
| {"reset", no_argument, NULL, 'r'}, |
| {"no-auto", no_argument, NULL, 'n'}, |
| {"version", no_argument, NULL, 'V'}, |
| {"help", no_argument, NULL, 'h'}, |
| {NULL, 0, NULL, 0} |
| }; |
| |
| #define next (current^1) |
| |
| setlocale(LC_ALL, ""); |
| bindtextdomain(PACKAGE, LOCALEDIR); |
| textdomain(PACKAGE); |
| atexit(close_stdout); |
| |
| proFile = defaultpro; |
| mapFile = defaultmap; |
| |
| while ((c = getopt_long(argc, argv, "m:p:M:ivabsrnVh", longopts, NULL)) != -1) { |
| switch (c) { |
| case 'm': |
| mapFile = optarg; |
| break; |
| case 'n': |
| optNative++; |
| break; |
| case 'p': |
| proFile = optarg; |
| break; |
| case 'a': |
| optAll++; |
| break; |
| case 'b': |
| optBins++; |
| break; |
| case 's': |
| optSub++; |
| break; |
| case 'i': |
| optInfo++; |
| break; |
| case 'M': |
| mult = optarg; |
| break; |
| case 'r': |
| optReset++; |
| break; |
| case 'v': |
| optVerbose++; |
| break; |
| case 'V': |
| printf(UTIL_LINUX_VERSION); |
| return EXIT_SUCCESS; |
| case 'h': |
| usage(stdout); |
| default: |
| errtryhelp(EXIT_FAILURE); |
| } |
| } |
| |
| if (optReset || mult) { |
| int multiplier, fd, to_write; |
| |
| /* When writing the multiplier, if the length of the |
| * write is not sizeof(int), the multiplier is not |
| * changed. */ |
| if (mult) { |
| multiplier = strtoul(mult, NULL, 10); |
| to_write = sizeof(int); |
| } else { |
| multiplier = 0; |
| /* sth different from sizeof(int) */ |
| to_write = 1; |
| } |
| /* try to become root, just in case */ |
| ignore_result( setuid(0) ); |
| fd = open(defaultpro, O_WRONLY); |
| if (fd < 0) |
| err(EXIT_FAILURE, "%s", defaultpro); |
| if (write(fd, &multiplier, to_write) != to_write) |
| err(EXIT_FAILURE, _("error writing %s"), defaultpro); |
| close(fd); |
| exit(EXIT_SUCCESS); |
| } |
| |
| /* Use an fd for the profiling buffer, to skip stdio overhead */ |
| if (((proFd = open(proFile, O_RDONLY)) < 0) |
| || ((int)(len = lseek(proFd, 0, SEEK_END)) < 0) |
| || (lseek(proFd, 0, SEEK_SET) < 0)) |
| err(EXIT_FAILURE, "%s", proFile); |
| |
| buf = xmalloc(len); |
| |
| rc = read(proFd, buf, len); |
| if (rc < 0 || (size_t) rc != len) |
| err(EXIT_FAILURE, "%s", proFile); |
| close(proFd); |
| |
| if (!optNative) { |
| int entries = len / sizeof(*buf); |
| int big = 0, small = 0; |
| unsigned *p; |
| size_t i; |
| |
| for (p = buf + 1; p < buf + entries; p++) { |
| if (*p & ~0U << (sizeof(*buf) * 4)) |
| big++; |
| if (*p & ((1 << (sizeof(*buf) * 4)) - 1)) |
| small++; |
| } |
| if (big > small) { |
| warnx(_("Assuming reversed byte order. " |
| "Use -n to force native byte order.")); |
| for (p = buf; p < buf + entries; p++) |
| for (i = 0; i < sizeof(*buf) / 2; i++) { |
| unsigned char *b = (unsigned char *)p; |
| unsigned char tmp; |
| tmp = b[i]; |
| b[i] = b[sizeof(*buf) - i - 1]; |
| b[sizeof(*buf) - i - 1] = tmp; |
| } |
| } |
| } |
| |
| step = buf[0]; |
| if (optInfo) { |
| printf(_("Sampling_step: %u\n"), step); |
| exit(EXIT_SUCCESS); |
| } |
| |
| total = 0; |
| |
| map = myopen(mapFile, "r", &popenMap); |
| if (map == NULL && mapFile == defaultmap) { |
| mapFile = boot_uname_r_str(); |
| map = myopen(mapFile, "r", &popenMap); |
| } |
| if (map == NULL) |
| err(EXIT_FAILURE, "%s", mapFile); |
| |
| while (fgets(mapline, S_LEN, map)) { |
| if (sscanf(mapline, "%llx %7[^\n ] %127[^\n ]", &fn_add, mode, fn_name) != 3) |
| errx(EXIT_FAILURE, _("%s(%i): wrong map line"), mapFile, |
| maplineno); |
| /* only elf works like this */ |
| if (!strcmp(fn_name, "_stext") || !strcmp(fn_name, "__stext")) { |
| add0 = fn_add; |
| break; |
| } |
| maplineno++; |
| } |
| |
| if (!add0) |
| errx(EXIT_FAILURE, _("can't find \"_stext\" in %s"), mapFile); |
| |
| /* |
| * Main loop. |
| */ |
| while (fgets(mapline, S_LEN, map)) { |
| unsigned int this = 0; |
| int done = 0; |
| |
| if (sscanf(mapline, "%llx %7[^\n ] %127[^\n ]", &next_add, mode, next_name) != 3) |
| errx(EXIT_FAILURE, _("%s(%i): wrong map line"), mapFile, |
| maplineno); |
| header_printed = 0; |
| |
| /* the kernel only profiles up to _etext */ |
| if (!strcmp(next_name, "_etext") || |
| !strcmp(next_name, "__etext")) |
| done = 1; |
| else { |
| /* ignore any LEADING (before a '[tT]' symbol |
| * is found) Absolute symbols and __init_end |
| * because some architectures place it before |
| * .text section */ |
| if ((*mode == 'A' || *mode == '?') |
| && (total == 0 || !strcmp(next_name, "__init_end"))) |
| continue; |
| if (*mode != 'T' && *mode != 't' && |
| *mode != 'W' && *mode != 'w') |
| break; /* only text is profiled */ |
| } |
| |
| if (indx >= len / sizeof(*buf)) |
| errx(EXIT_FAILURE, |
| _("profile address out of range. Wrong map file?")); |
| |
| while (indx < (next_add - add0) / step) { |
| if (optBins && (buf[indx] || optAll)) { |
| if (!header_printed) { |
| printf("%s:\n", fn_name); |
| header_printed = 1; |
| } |
| printf("\t%llx\t%u\n", (indx - 1) * step + add0, |
| buf[indx]); |
| } |
| this += buf[indx++]; |
| } |
| total += this; |
| |
| if (optBins) { |
| if (optVerbose || this > 0) |
| printf(" total\t\t\t\t%u\n", this); |
| } else if ((this || optAll) && |
| (fn_len = next_add - fn_add) != 0) { |
| if (optVerbose) |
| printf("%016llx %-40s %6u %8.4f\n", fn_add, |
| fn_name, this, this / (double)fn_len); |
| else |
| printf("%6u %-40s %8.4f\n", |
| this, fn_name, this / (double)fn_len); |
| if (optSub) { |
| unsigned long long scan; |
| |
| for (scan = (fn_add - add0) / step + 1; |
| scan < (next_add - add0) / step; |
| scan++) { |
| unsigned long long addr; |
| addr = (scan - 1) * step + add0; |
| printf("\t%#llx\t%s+%#llx\t%u\n", |
| addr, fn_name, addr - fn_add, |
| buf[scan]); |
| } |
| } |
| } |
| |
| fn_add = next_add; |
| strcpy(fn_name, next_name); |
| |
| maplineno++; |
| if (done) |
| break; |
| } |
| |
| /* clock ticks, out of kernel text - probably modules */ |
| printf("%6u %s\n", buf[len / sizeof(*buf) - 1], "*unknown*"); |
| |
| /* trailer */ |
| if (optVerbose) |
| printf("%016x %-40s %6u %8.4f\n", |
| 0, "total", total, total / (double)(fn_add - add0)); |
| else |
| printf("%6u %-40s %8.4f\n", |
| total, _("total"), total / (double)(fn_add - add0)); |
| |
| popenMap ? pclose(map) : fclose(map); |
| exit(EXIT_SUCCESS); |
| } |