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perf tools: Enable close-on-exec flag on perf file descriptor

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In commit a21b0b354d ('perf: Introduce a flag to enable
close-on-exec in perf_event_open()'), flag PERF_FLAG_FD_CLOEXEC
was added to perf_event_open(2) syscall to allows userspace
to atomically enable close-on-exec behavor when creating
the file descriptor.

This patch makes perf tools use the new flag if supported
by the kernel, so that the event file descriptors got
automatically closed if perf tool exec a sub-command.

Signed-off-by: Yann Droneaud <ydroneaud@opteya.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/1404160127-7475-1-git-send-email-ydroneaud@opteya.com
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
This commit is contained in:
Yann Droneaud 2014-06-30 22:28:47 +02:00 committed by Jiri Olsa
parent ec6dbcb7ad
commit 57480d2cd9
11 changed files with 97 additions and 12 deletions
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1
tools/perf/Makefile.perf
View File

@ -376,6 +376,7 @@ LIB_OBJS += $(OUTPUT)util/record.o
LIB_OBJS += $(OUTPUT)util/srcline.o
LIB_OBJS += $(OUTPUT)util/data.o
LIB_OBJS += $(OUTPUT)util/tsc.o
LIB_OBJS += $(OUTPUT)util/cloexec.o
LIB_OBJS += $(OUTPUT)ui/setup.o
LIB_OBJS += $(OUTPUT)ui/helpline.o

4
tools/perf/bench/mem-memcpy.c
View File

@ -10,6 +10,7 @@
#include "../util/util.h"
#include "../util/parse-options.h"
#include "../util/header.h"
#include "../util/cloexec.h"
#include "bench.h"
#include "mem-memcpy-arch.h"
@ -83,7 +84,8 @@ static struct perf_event_attr cycle_attr = {
static void init_cycle(void)
{
cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, 0);
cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1,
perf_event_open_cloexec_flag());
if (cycle_fd < 0 && errno == ENOSYS)
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");

4
tools/perf/bench/mem-memset.c
View File

@ -10,6 +10,7 @@
#include "../util/util.h"
#include "../util/parse-options.h"
#include "../util/header.h"
#include "../util/cloexec.h"
#include "bench.h"
#include "mem-memset-arch.h"
@ -83,7 +84,8 @@ static struct perf_event_attr cycle_attr = {
static void init_cycle(void)
{
cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1, 0);
cycle_fd = sys_perf_event_open(&cycle_attr, getpid(), -1, -1,
perf_event_open_cloexec_flag());
if (cycle_fd < 0 && errno == ENOSYS)
die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");

4
tools/perf/builtin-sched.c
View File

@ -10,6 +10,7 @@
#include "util/header.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/cloexec.h"
#include "util/parse-options.h"
#include "util/trace-event.h"
@ -434,7 +435,8 @@ static int self_open_counters(void)
attr.type = PERF_TYPE_SOFTWARE;
attr.config = PERF_COUNT_SW_TASK_CLOCK;
fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
fd = sys_perf_event_open(&attr, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0)
pr_err("Error: sys_perf_event_open() syscall returned "

4
tools/perf/tests/bp_signal.c
View File

@ -25,6 +25,7 @@
#include "tests.h"
#include "debug.h"
#include "perf.h"
#include "cloexec.h"
static int fd1;
static int fd2;
@ -78,7 +79,8 @@ static int bp_event(void *fn, int setup_signal)
pe.exclude_kernel = 1;
pe.exclude_hv = 1;
fd = sys_perf_event_open(&pe, 0, -1, -1, 0);
fd = sys_perf_event_open(&pe, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
pr_debug("failed opening event %llx\n", pe.config);
return TEST_FAIL;

4
tools/perf/tests/bp_signal_overflow.c
View File

@ -24,6 +24,7 @@
#include "tests.h"
#include "debug.h"
#include "perf.h"
#include "cloexec.h"
static int overflows;
@ -91,7 +92,8 @@ int test__bp_signal_overflow(void)
pe.exclude_kernel = 1;
pe.exclude_hv = 1;
fd = sys_perf_event_open(&pe, 0, -1, -1, 0);
fd = sys_perf_event_open(&pe, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
pr_debug("failed opening event %llx\n", pe.config);
return TEST_FAIL;

4
tools/perf/tests/rdpmc.c
View File

@ -6,6 +6,7 @@
#include "perf.h"
#include "debug.h"
#include "tests.h"
#include "cloexec.h"
#if defined(__x86_64__) || defined(__i386__)
@ -104,7 +105,8 @@ static int __test__rdpmc(void)
sa.sa_sigaction = segfault_handler;
sigaction(SIGSEGV, &sa, NULL);
fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
fd = sys_perf_event_open(&attr, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
pr_err("Error: sys_perf_event_open() syscall returned "
"with %d (%s)\n", fd, strerror(errno));

57
tools/perf/util/cloexec.c Normal file
View File

@ -0,0 +1,57 @@
#include "util.h"
#include "../perf.h"
#include "cloexec.h"
#include "asm/bug.h"
static unsigned long flag = PERF_FLAG_FD_CLOEXEC;
static int perf_flag_probe(void)
{
/* use 'safest' configuration as used in perf_evsel__fallback() */
struct perf_event_attr attr = {
.type = PERF_COUNT_SW_CPU_CLOCK,
.config = PERF_COUNT_SW_CPU_CLOCK,
};
int fd;
int err;
/* check cloexec flag */
fd = sys_perf_event_open(&attr, 0, -1, -1,
PERF_FLAG_FD_CLOEXEC);
err = errno;
if (fd >= 0) {
close(fd);
return 1;
}
WARN_ONCE(err != EINVAL,
"perf_event_open(..., PERF_FLAG_FD_CLOEXEC) failed with unexpected error %d (%s)\n",
err, strerror(err));
/* not supported, confirm error related to PERF_FLAG_FD_CLOEXEC */
fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
err = errno;
if (WARN_ONCE(fd < 0,
"perf_event_open(..., 0) failed unexpectedly with error %d (%s)\n",
err, strerror(err)))
return -1;
close(fd);
return 0;
}
unsigned long perf_event_open_cloexec_flag(void)
{
static bool probed;
if (!probed) {
if (perf_flag_probe() <= 0)
flag = 0;
probed = true;
}
return flag;
}

6
tools/perf/util/cloexec.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef __PERF_CLOEXEC_H
#define __PERF_CLOEXEC_H
unsigned long perf_event_open_cloexec_flag(void);
#endif /* __PERF_CLOEXEC_H */

12
tools/perf/util/evsel.c
View File

@ -29,6 +29,7 @@ static struct {
bool sample_id_all;
bool exclude_guest;
bool mmap2;
bool cloexec;
} perf_missing_features;
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
@ -994,7 +995,7 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
struct thread_map *threads)
{
int cpu, thread;
unsigned long flags = 0;
unsigned long flags = PERF_FLAG_FD_CLOEXEC;
int pid = -1, err;
enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
@ -1003,11 +1004,13 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
return -ENOMEM;
if (evsel->cgrp) {
flags = PERF_FLAG_PID_CGROUP;
flags |= PERF_FLAG_PID_CGROUP;
pid = evsel->cgrp->fd;
}
fallback_missing_features:
if (perf_missing_features.cloexec)
flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
if (perf_missing_features.mmap2)
evsel->attr.mmap2 = 0;
if (perf_missing_features.exclude_guest)
@ -1076,7 +1079,10 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
if (err != -EINVAL || cpu > 0 || thread > 0)
goto out_close;
if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
perf_missing_features.cloexec = true;
goto fallback_missing_features;
} else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
perf_missing_features.mmap2 = true;
goto fallback_missing_features;
} else if (!perf_missing_features.exclude_guest &&

9
tools/perf/util/record.c
View File

@ -4,6 +4,7 @@
#include "parse-events.h"
#include <api/fs/fs.h>
#include "util.h"
#include "cloexec.h"
typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
@ -11,6 +12,7 @@ static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
{
struct perf_evlist *evlist;
struct perf_evsel *evsel;
unsigned long flags = perf_event_open_cloexec_flag();
int err = -EAGAIN, fd;
evlist = perf_evlist__new();
@ -22,14 +24,14 @@ static int perf_do_probe_api(setup_probe_fn_t fn, int cpu, const char *str)
evsel = perf_evlist__first(evlist);
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, flags);
if (fd < 0)
goto out_delete;
close(fd);
fn(evsel);
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, flags);
if (fd < 0) {
if (errno == EINVAL)
err = -EINVAL;
@ -219,7 +221,8 @@ bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
cpu = evlist->cpus->map[0];
}
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1, 0);
fd = sys_perf_event_open(&evsel->attr, -1, cpu, -1,
perf_event_open_cloexec_flag());
if (fd >= 0) {
close(fd);
ret = true;