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Subject[tip: perf/urgent] perf bench: Share some global variables to fix build with gcc 10
The following commit has been merged into the perf/urgent branch of tip:

Commit-ID: e4d9b04b973b2dbce7b42af95ea70d07da1c936d
Gitweb: https://git.kernel.org/tip/e4d9b04b973b2dbce7b42af95ea70d07da1c936d
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Mon, 02 Mar 2020 12:09:38 -03:00
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitterDate: Tue, 03 Mar 2020 16:19:49 -03:00

perf bench: Share some global variables to fix build with gcc 10

Noticed with gcc 10 (fedora rawhide) that those variables were not being
declared as static, so end up with:

ld: /tmp/build/perf/bench/epoll-wait.o:/git/perf/tools/perf/bench/epoll-wait.c:93: multiple definition of `end'; /tmp/build/perf/bench/futex-hash.o:/git/perf/tools/perf/bench/futex-hash.c:40: first defined here
ld: /tmp/build/perf/bench/epoll-wait.o:/git/perf/tools/perf/bench/epoll-wait.c:93: multiple definition of `start'; /tmp/build/perf/bench/futex-hash.o:/git/perf/tools/perf/bench/futex-hash.c:40: first defined here
ld: /tmp/build/perf/bench/epoll-wait.o:/git/perf/tools/perf/bench/epoll-wait.c:93: multiple definition of `runtime'; /tmp/build/perf/bench/futex-hash.o:/git/perf/tools/perf/bench/futex-hash.c:40: first defined here
ld: /tmp/build/perf/bench/epoll-ctl.o:/git/perf/tools/perf/bench/epoll-ctl.c:38: multiple definition of `end'; /tmp/build/perf/bench/futex-hash.o:/git/perf/tools/perf/bench/futex-hash.c:40: first defined here
ld: /tmp/build/perf/bench/epoll-ctl.o:/git/perf/tools/perf/bench/epoll-ctl.c:38: multiple definition of `start'; /tmp/build/perf/bench/futex-hash.o:/git/perf/tools/perf/bench/futex-hash.c:40: first defined here
ld: /tmp/build/perf/bench/epoll-ctl.o:/git/perf/tools/perf/bench/epoll-ctl.c:38: multiple definition of `runtime'; /tmp/build/perf/bench/futex-hash.o:/git/perf/tools/perf/bench/futex-hash.c:40: first defined here
make[4]: *** [/git/perf/tools/build/Makefile.build:145: /tmp/build/perf/bench/perf-in.o] Error 1

Prefix those with bench__ and add them to bench/bench.h, so that we can
share those on the tools needing to access those variables from signal
handlers.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20200303155811.GD13702@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/bench/bench.h | 4 ++++
tools/perf/bench/epoll-ctl.c | 7 +++----
tools/perf/bench/epoll-wait.c | 11 +++++------
tools/perf/bench/futex-hash.c | 12 ++++++------
tools/perf/bench/futex-lock-pi.c | 11 +++++------
5 files changed, 23 insertions(+), 22 deletions(-)

diff --git a/tools/perf/bench/bench.h b/tools/perf/bench/bench.h
index fddb3ce..4aa6de1 100644
--- a/tools/perf/bench/bench.h
+++ b/tools/perf/bench/bench.h
@@ -2,6 +2,10 @@
#ifndef BENCH_H
#define BENCH_H

+#include <sys/time.h>
+
+extern struct timeval bench__start, bench__end, bench__runtime;
+
/*
* The madvise transparent hugepage constants were added in glibc
* 2.13. For compatibility with older versions of glibc, define these
diff --git a/tools/perf/bench/epoll-ctl.c b/tools/perf/bench/epoll-ctl.c
index bb617e5..a7526c0 100644
--- a/tools/perf/bench/epoll-ctl.c
+++ b/tools/perf/bench/epoll-ctl.c
@@ -35,7 +35,6 @@

static unsigned int nthreads = 0;
static unsigned int nsecs = 8;
-struct timeval start, end, runtime;
static bool done, __verbose, randomize;

/*
@@ -94,8 +93,8 @@ static void toggle_done(int sig __maybe_unused,
{
/* inform all threads that we're done for the day */
done = true;
- gettimeofday(&end, NULL);
- timersub(&end, &start, &runtime);
+ gettimeofday(&bench__end, NULL);
+ timersub(&bench__end, &bench__start, &bench__runtime);
}

static void nest_epollfd(void)
@@ -361,7 +360,7 @@ int bench_epoll_ctl(int argc, const char **argv)

threads_starting = nthreads;

- gettimeofday(&start, NULL);
+ gettimeofday(&bench__start, NULL);

do_threads(worker, cpu);

diff --git a/tools/perf/bench/epoll-wait.c b/tools/perf/bench/epoll-wait.c
index 7af6944..d1c5cb5 100644
--- a/tools/perf/bench/epoll-wait.c
+++ b/tools/perf/bench/epoll-wait.c
@@ -90,7 +90,6 @@

static unsigned int nthreads = 0;
static unsigned int nsecs = 8;
-struct timeval start, end, runtime;
static bool wdone, done, __verbose, randomize, nonblocking;

/*
@@ -276,8 +275,8 @@ static void toggle_done(int sig __maybe_unused,
{
/* inform all threads that we're done for the day */
done = true;
- gettimeofday(&end, NULL);
- timersub(&end, &start, &runtime);
+ gettimeofday(&bench__end, NULL);
+ timersub(&bench__end, &bench__start, &bench__runtime);
}

static void print_summary(void)
@@ -287,7 +286,7 @@ static void print_summary(void)

printf("\nAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
avg, rel_stddev_stats(stddev, avg),
- (int) runtime.tv_sec);
+ (int)bench__runtime.tv_sec);
}

static int do_threads(struct worker *worker, struct perf_cpu_map *cpu)
@@ -479,7 +478,7 @@ int bench_epoll_wait(int argc, const char **argv)

threads_starting = nthreads;

- gettimeofday(&start, NULL);
+ gettimeofday(&bench__start, NULL);

do_threads(worker, cpu);

@@ -519,7 +518,7 @@ int bench_epoll_wait(int argc, const char **argv)
qsort(worker, nthreads, sizeof(struct worker), cmpworker);

for (i = 0; i < nthreads; i++) {
- unsigned long t = worker[i].ops/runtime.tv_sec;
+ unsigned long t = worker[i].ops / bench__runtime.tv_sec;

update_stats(&throughput_stats, t);

diff --git a/tools/perf/bench/futex-hash.c b/tools/perf/bench/futex-hash.c
index 8ba0c33..2177686 100644
--- a/tools/perf/bench/futex-hash.c
+++ b/tools/perf/bench/futex-hash.c
@@ -37,7 +37,7 @@ static unsigned int nfutexes = 1024;
static bool fshared = false, done = false, silent = false;
static int futex_flag = 0;

-struct timeval start, end, runtime;
+struct timeval bench__start, bench__end, bench__runtime;
static pthread_mutex_t thread_lock;
static unsigned int threads_starting;
static struct stats throughput_stats;
@@ -103,8 +103,8 @@ static void toggle_done(int sig __maybe_unused,
{
/* inform all threads that we're done for the day */
done = true;
- gettimeofday(&end, NULL);
- timersub(&end, &start, &runtime);
+ gettimeofday(&bench__end, NULL);
+ timersub(&bench__end, &bench__start, &bench__runtime);
}

static void print_summary(void)
@@ -114,7 +114,7 @@ static void print_summary(void)

printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
!silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
- (int) runtime.tv_sec);
+ (int)bench__runtime.tv_sec);
}

int bench_futex_hash(int argc, const char **argv)
@@ -161,7 +161,7 @@ int bench_futex_hash(int argc, const char **argv)

threads_starting = nthreads;
pthread_attr_init(&thread_attr);
- gettimeofday(&start, NULL);
+ gettimeofday(&bench__start, NULL);
for (i = 0; i < nthreads; i++) {
worker[i].tid = i;
worker[i].futex = calloc(nfutexes, sizeof(*worker[i].futex));
@@ -204,7 +204,7 @@ int bench_futex_hash(int argc, const char **argv)
pthread_mutex_destroy(&thread_lock);

for (i = 0; i < nthreads; i++) {
- unsigned long t = worker[i].ops/runtime.tv_sec;
+ unsigned long t = worker[i].ops / bench__runtime.tv_sec;
update_stats(&throughput_stats, t);
if (!silent) {
if (nfutexes == 1)
diff --git a/tools/perf/bench/futex-lock-pi.c b/tools/perf/bench/futex-lock-pi.c
index d0cae81..30d9712 100644
--- a/tools/perf/bench/futex-lock-pi.c
+++ b/tools/perf/bench/futex-lock-pi.c
@@ -37,7 +37,6 @@ static bool silent = false, multi = false;
static bool done = false, fshared = false;
static unsigned int nthreads = 0;
static int futex_flag = 0;
-struct timeval start, end, runtime;
static pthread_mutex_t thread_lock;
static unsigned int threads_starting;
static struct stats throughput_stats;
@@ -64,7 +63,7 @@ static void print_summary(void)

printf("%sAveraged %ld operations/sec (+- %.2f%%), total secs = %d\n",
!silent ? "\n" : "", avg, rel_stddev_stats(stddev, avg),
- (int) runtime.tv_sec);
+ (int)bench__runtime.tv_sec);
}

static void toggle_done(int sig __maybe_unused,
@@ -73,8 +72,8 @@ static void toggle_done(int sig __maybe_unused,
{
/* inform all threads that we're done for the day */
done = true;
- gettimeofday(&end, NULL);
- timersub(&end, &start, &runtime);
+ gettimeofday(&bench__end, NULL);
+ timersub(&bench__end, &bench__start, &bench__runtime);
}

static void *workerfn(void *arg)
@@ -185,7 +184,7 @@ int bench_futex_lock_pi(int argc, const char **argv)

threads_starting = nthreads;
pthread_attr_init(&thread_attr);
- gettimeofday(&start, NULL);
+ gettimeofday(&bench__start, NULL);

create_threads(worker, thread_attr, cpu);
pthread_attr_destroy(&thread_attr);
@@ -211,7 +210,7 @@ int bench_futex_lock_pi(int argc, const char **argv)
pthread_mutex_destroy(&thread_lock);

for (i = 0; i < nthreads; i++) {
- unsigned long t = worker[i].ops/runtime.tv_sec;
+ unsigned long t = worker[i].ops / bench__runtime.tv_sec;

update_stats(&throughput_stats, t);
if (!silent)
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