提交 032db28e 编写于 作者: J Jiri Olsa 提交者: Ingo Molnar

perf tests: Add breakpoint accounting/modify test

Adding test that:

  - detects the number of watch/break-points,
    skip test if any is missing
  - detects PERF_EVENT_IOC_MODIFY_ATTRIBUTES ioctl,
    skip test if it's missing
  - detects if watchpoints and breakpoints share
    same slots
  - create all possible watchpoints on cpu 0
  - change one of it to breakpoint
  - in case wp and bp do not share slots,
    we create another watchpoint to ensure
    the slot accounting is correct
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Hari Bathini <hbathini@linux.vnet.ibm.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Milind Chabbi <chabbi.milind@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Oleg Nesterov <onestero@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/20180312134548.31532-9-jolsa@kernel.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>
上级 5f970521
......@@ -20,6 +20,7 @@ perf-y += hists_cumulate.o
perf-y += python-use.o
perf-y += bp_signal.o
perf-y += bp_signal_overflow.o
perf-y += bp_account.o
perf-y += task-exit.o
perf-y += sw-clock.o
perf-y += mmap-thread-lookup.o
......
/*
* Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
* 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
*/
#define __SANE_USERSPACE_TYPES__
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <time.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/mman.h>
#include <linux/compiler.h>
#include <linux/hw_breakpoint.h>
#include <sys/ioctl.h>
#include "tests.h"
#include "debug.h"
#include "perf.h"
#include "cloexec.h"
volatile long the_var;
static noinline int test_function(void)
{
return 0;
}
static int __event(bool is_x, void *addr, struct perf_event_attr *attr)
{
int fd;
memset(attr, 0, sizeof(struct perf_event_attr));
attr->type = PERF_TYPE_BREAKPOINT;
attr->size = sizeof(struct perf_event_attr);
attr->config = 0;
attr->bp_type = is_x ? HW_BREAKPOINT_X : HW_BREAKPOINT_W;
attr->bp_addr = (unsigned long) addr;
attr->bp_len = sizeof(long);
attr->sample_period = 1;
attr->sample_type = PERF_SAMPLE_IP;
attr->exclude_kernel = 1;
attr->exclude_hv = 1;
fd = sys_perf_event_open(attr, -1, 0, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
pr_debug("failed opening event %llx\n", attr->config);
return TEST_FAIL;
}
return fd;
}
static int wp_event(void *addr, struct perf_event_attr *attr)
{
return __event(false, addr, attr);
}
static int bp_event(void *addr, struct perf_event_attr *attr)
{
return __event(true, addr, attr);
}
static int bp_accounting(int wp_cnt, int share)
{
struct perf_event_attr attr, attr_mod, attr_new;
int i, fd[wp_cnt], fd_wp, ret;
for (i = 0; i < wp_cnt; i++) {
fd[i] = wp_event((void *)&the_var, &attr);
TEST_ASSERT_VAL("failed to create wp\n", fd[i] != -1);
pr_debug("wp %d created\n", i);
}
attr_mod = attr;
attr_mod.bp_type = HW_BREAKPOINT_X;
attr_mod.bp_addr = (unsigned long) test_function;
ret = ioctl(fd[0], PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &attr_mod);
TEST_ASSERT_VAL("failed to modify wp\n", ret == 0);
pr_debug("wp 0 modified to bp\n");
if (!share) {
fd_wp = wp_event((void *)&the_var, &attr_new);
TEST_ASSERT_VAL("failed to create max wp\n", fd_wp != -1);
pr_debug("wp max created\n");
}
for (i = 0; i < wp_cnt; i++)
close(fd[i]);
return 0;
}
static int detect_cnt(bool is_x)
{
struct perf_event_attr attr;
void *addr = is_x ? test_function : (void *) &the_var;
int fd[100], cnt = 0, i;
while (1) {
fd[cnt] = __event(is_x, addr, &attr);
if (fd[cnt] < 0)
break;
if (cnt == 100) {
pr_debug("way too many debug registers, fix the test\n");
return 0;
}
cnt++;
}
for (i = 0; i < cnt; i++)
close(fd[i]);
return cnt;
}
static int detect_ioctl(void)
{
struct perf_event_attr attr;
int fd, ret = 1;
fd = wp_event((void *) &the_var, &attr);
if (fd > 0) {
ret = ioctl(fd, PERF_EVENT_IOC_MODIFY_ATTRIBUTES, &attr);
close(fd);
}
return ret ? 0 : 1;
}
static int detect_share(int wp_cnt, int bp_cnt)
{
struct perf_event_attr attr;
int i, fd[wp_cnt + bp_cnt], ret;
for (i = 0; i < wp_cnt; i++) {
fd[i] = wp_event((void *)&the_var, &attr);
TEST_ASSERT_VAL("failed to create wp\n", fd[i] != -1);
}
for (; i < (bp_cnt + wp_cnt); i++) {
fd[i] = bp_event((void *)test_function, &attr);
if (fd[i] == -1)
break;
}
ret = i != (bp_cnt + wp_cnt);
while (i--)
close(fd[i]);
return ret;
}
/*
* This test does following:
* - detects the number of watch/break-points,
* skip test if any is missing
* - detects PERF_EVENT_IOC_MODIFY_ATTRIBUTES ioctl,
* skip test if it's missing
* - detects if watchpoints and breakpoints share
* same slots
* - create all possible watchpoints on cpu 0
* - change one of it to breakpoint
* - in case wp and bp do not share slots,
* we create another watchpoint to ensure
* the slot accounting is correct
*/
int test__bp_accounting(struct test *test __maybe_unused, int subtest __maybe_unused)
{
int has_ioctl = detect_ioctl();
int wp_cnt = detect_cnt(false);
int bp_cnt = detect_cnt(true);
int share = detect_share(wp_cnt, bp_cnt);
pr_debug("watchpoints count %d, breakpoints count %d, has_ioctl %d, share %d\n",
wp_cnt, bp_cnt, has_ioctl, share);
if (!wp_cnt || !bp_cnt || !has_ioctl)
return TEST_SKIP;
return bp_accounting(wp_cnt, share);
}
......@@ -115,6 +115,10 @@ static struct test generic_tests[] = {
.func = test__bp_signal_overflow,
.is_supported = test__bp_signal_is_supported,
},
{
.desc = "Breakpoint accounting",
.func = test__bp_accounting,
},
{
.desc = "Number of exit events of a simple workload",
.func = test__task_exit,
......
......@@ -58,6 +58,7 @@ int test__hists_link(struct test *test, int subtest);
int test__python_use(struct test *test, int subtest);
int test__bp_signal(struct test *test, int subtest);
int test__bp_signal_overflow(struct test *test, int subtest);
int test__bp_accounting(struct test *test, int subtest);
int test__task_exit(struct test *test, int subtest);
int test__mem(struct test *test, int subtest);
int test__sw_clock_freq(struct test *test, int subtest);
......
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