futex_wait_thp: Add basic transparent hugepages test
Create a new functional test to allocate a transparent hugepage, then
futex_wait on a futex from each page in the hugepage. Perform a basic
wait with timeout simply to verify functionality.
Suggested-by: David Miller <davem@davemloft.net>
Signed-off-by: Darren Hart <dvhart@infradead.org>
diff --git a/functional/Makefile b/functional/Makefile
index 6ecb42c..aa669b6 100644
--- a/functional/Makefile
+++ b/functional/Makefile
@@ -5,6 +5,7 @@
HEADERS := ../include/futextest.h
TARGETS := \
futex_wait_timeout \
+ futex_wait_thp \
futex_wait_wouldblock \
futex_requeue_pi \
futex_requeue_pi_signal_restart \
diff --git a/functional/futex_wait_thp.c b/functional/futex_wait_thp.c
new file mode 100644
index 0000000..6079a8e
--- /dev/null
+++ b/functional/futex_wait_thp.c
@@ -0,0 +1,109 @@
+/******************************************************************************
+ *
+ * Copyright © Darren Hart, 2014
+ *
+ * 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.
+ *
+ * NAME
+ * futex_wait_thp.c
+ *
+ * DESCRIPTION
+ * Excercise futexes mapped from transparent huge pages.
+ *
+ * AUTHOR
+ * Darren Hart <dvhart@infradead.org>
+ *
+ *****************************************************************************/
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <malloc.h>
+#include <libgen.h>
+#include <unistd.h>
+#include "futextest.h"
+#include "logging.h"
+
+
+/* FIXME: determine THP size at runtime? */
+#define HUGE_PAGE_SIZE (8 * 1024 * 1024)
+#define TIMEOUT_NS 100
+
+void usage(char *prog)
+{
+ printf("Usage: %s\n", prog);
+ printf(" -c Use color\n");
+ printf(" -h Display this help message\n");
+ printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n",
+ VQUIET, VCRITICAL, VINFO);
+}
+
+int main(int argc, char *argv[])
+{
+ long huge_page_size = HUGE_PAGE_SIZE;
+ int ret = RET_PASS;
+ struct timespec to;
+ long page_size;
+ void *thp_buf;
+ futex_t *f1;
+ int res;
+ char c;
+
+ /* initialize timeout */
+ to.tv_sec = 0;
+ to.tv_nsec = TIMEOUT_NS;
+
+ while ((c = getopt(argc, argv, "ch:v:")) != -1) {
+ switch(c) {
+ case 'c':
+ log_color(1);
+ break;
+ case 'h':
+ usage(basename(argv[0]));
+ exit(0);
+ case 'v':
+ log_verbosity(atoi(optarg));
+ break;
+ default:
+ usage(basename(argv[0]));
+ exit(1);
+ }
+ }
+
+ page_size = sysconf(_SC_PAGESIZE);
+
+ printf("%s: Excercise futexes mapped from transparent huge pages\n", basename(argv[0]));
+ printf(" huge page size: %ld\n", huge_page_size);
+ printf(" page size: %ld\n", page_size);
+ printf(" iterations: %ld\n", huge_page_size / page_size);
+
+ thp_buf = memalign(huge_page_size, huge_page_size);
+ /* FIXME: Verify a hugepage was created */
+
+ f1 = (futex_t *)thp_buf;
+
+ while ((void *)f1 < thp_buf + huge_page_size) {
+ info("Calling futex_wait on thp futex: %p\n", f1);
+ res = futex_wait(f1, *f1, &to, FUTEX_PRIVATE_FLAG);
+ if (!res || errno != ETIMEDOUT) {
+ fail("futex_wait returned %d\n", ret < 0 ? errno : ret);
+ ret = RET_FAIL;
+ break;
+ }
+ f1 = (futex_t *)((void *)f1 + page_size);
+ }
+
+ print_result(ret);
+ return ret;
+}
diff --git a/functional/run.sh b/functional/run.sh
index 571a4a4..64d0dcd 100755
--- a/functional/run.sh
+++ b/functional/run.sh
@@ -90,3 +90,5 @@
./futex_wait_uninitialized_heap $COLOR
./futex_wait_private_mapped_file $COLOR
+echo
+./futex_wait_thp $COLOR
