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perf bench breakpoint: Skip run if no breakpoints available

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Based on commit 7d54a4acd8 ("perf test: Skip watchpoint tests if
no watchpoints available"), hardware breakpoints are not available for
power9 platform and because of that 'perf bench breakpoint' run fails on
power9 platform.

Add code to check for the return value of perf_event_open() in the
breakpoint run and skip the 'perf bench breakpoint' run, if hardware
breakpoints are not available.

Result on power9 system before patch changes:

  [command]# perf bench breakpoint thread
  perf_event_open: No such device

Result on power9 system after patch changes:

  [command]# ./perf bench breakpoint thread
  Skipping perf bench breakpoint thread: No hardware support

Reported-by: Disha Goel <disgoel@linux.vnet.ibm.com>
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Acked-by: Naveen N Rao <naveen@kernel.org>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Disha Goel <disgoel@linux.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: https://lore.kernel.org/r/20230823075103.190565-1-kjain@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kajol Jain 2023-08-23 13:21:03 +05:30 committed by Arnaldo Carvalho de Melo
parent 7a46404b3c
commit 9823ae6f68
1 changed files with 21 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
tools/perf/bench/breakpoint.c
View File

@ -47,6 +47,7 @@ struct breakpoint {
static int breakpoint_setup(void *addr)
{
struct perf_event_attr attr = { .size = 0, };
int fd;
attr.type = PERF_TYPE_BREAKPOINT;
attr.size = sizeof(attr);
@ -56,7 +57,12 @@ static int breakpoint_setup(void *addr)
attr.bp_addr = (unsigned long)addr;
attr.bp_type = HW_BREAKPOINT_RW;
attr.bp_len = HW_BREAKPOINT_LEN_1;
return syscall(SYS_perf_event_open, &attr, 0, -1, -1, 0);
fd = syscall(SYS_perf_event_open, &attr, 0, -1, -1, 0);
if (fd < 0)
fd = -errno;
return fd;
}
static void *passive_thread(void *arg)
@ -122,9 +128,15 @@ int bench_breakpoint_thread(int argc, const char **argv)
for (i = 0; i < thread_params.nbreakpoints; i++) {
breakpoints[i].fd = breakpoint_setup(&breakpoints[i].watched);
if (breakpoints[i].fd == -1)
if (breakpoints[i].fd < 0) {
if (breakpoints[i].fd == -ENODEV) {
printf("Skipping perf bench breakpoint thread: No hardware support\n");
return 0;
}
exit((perror("perf_event_open"), EXIT_FAILURE));
}
}
gettimeofday(&start, NULL);
for (i = 0; i < thread_params.nparallel; i++) {
if (pthread_create(&parallel[i], NULL, breakpoint_thread, &repeat))
@ -196,8 +208,14 @@ int bench_breakpoint_enable(int argc, const char **argv)
exit(EXIT_FAILURE);
}
fd = breakpoint_setup(&watched);
if (fd == -1)
if (fd < 0) {
if (fd == -ENODEV) {
printf("Skipping perf bench breakpoint enable: No hardware support\n");
return 0;
}
exit((perror("perf_event_open"), EXIT_FAILURE));
}
nthreads = enable_params.npassive + enable_params.nactive;
threads = calloc(nthreads, sizeof(threads[0]));
if (!threads)