[tip:perf/urgent] perf test: Fix build on older glibcs

tip-bot for Arnaldo Carvalho de Melo
2011-01-23T18:01:27Z

Commit-ID: 57b84e53171ce672683faf1cab2e660965a6bdaf
Gitweb: http://git.kernel.org/tip/57b84e53171ce672683faf1cab2e660965a6bdaf
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Sat, 22 Jan 2011 23:14:20 -0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Sat, 22 Jan 2011 23:14:20 -0200

perf test: Fix build on older glibcs

Where we don't have CPU_ALLOC & friends. As the tools are being used in older
distros where the only allowed change are to replace the kernel, like RHEL4 and
5.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-test.c | 33 +++++++++++++++++++--------------
1 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 02958d6..0e01834 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -332,8 +332,7 @@ static int test__open_syscall_event_on_all_cpus(void)
struct perf_evsel *evsel;
struct perf_event_attr attr;
unsigned int nr_open_calls = 111, i;
- cpu_set_t *cpu_set;
- size_t cpu_set_size;
+ cpu_set_t cpu_set;
int id = trace_event__id("sys_enter_open");

if (id < 0) {
@@ -353,13 +352,8 @@ static int test__open_syscall_event_on_all_cpus(void)
return -1;
}

- cpu_set = CPU_ALLOC(cpus->nr);

- if (cpu_set == NULL)
- goto out_thread_map_delete;
-
- cpu_set_size = CPU_ALLOC_SIZE(cpus->nr);
- CPU_ZERO_S(cpu_set_size, cpu_set);
+ CPU_ZERO(&cpu_set);

memset(&attr, 0, sizeof(attr));
attr.type = PERF_TYPE_TRACEPOINT;
@@ -367,7 +361,7 @@ static int test__open_syscall_event_on_all_cpus(void)
evsel = perf_evsel__new(&attr, 0);
if (evsel == NULL) {
pr_debug("perf_evsel__new\n");
- goto out_cpu_free;
+ goto out_thread_map_delete;
}

if (perf_evsel__open(evsel, cpus, threads) < 0) {
@@ -379,9 +373,19 @@ static int test__open_syscall_event_on_all_cpus(void)

for (cpu = 0; cpu < cpus->nr; ++cpu) {
unsigned int ncalls = nr_open_calls + cpu;
+ /*
+ * XXX eventually lift this restriction in a way that
+ * keeps perf building on older glibc installations
+ * without CPU_ALLOC. 1024 cpus in 2010 still seems
+ * a reasonable upper limit tho :-)
+ */
+ if (cpus->map[cpu] >= CPU_SETSIZE) {
+ pr_debug("Ignoring CPU %d\n", cpus->map[cpu]);
+ continue;
+ }

- CPU_SET_S(cpus->map[cpu], cpu_set_size, cpu_set);
- if (sched_setaffinity(0, cpu_set_size, cpu_set) < 0) {
+ CPU_SET(cpus->map[cpu], &cpu_set);
+ if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) < 0) {
pr_debug("sched_setaffinity() failed on CPU %d: %s ",
cpus->map[cpu],
strerror(errno));
@@ -391,7 +395,7 @@ static int test__open_syscall_event_on_all_cpus(void)
fd = open("/etc/passwd", O_RDONLY);
close(fd);
}
- CPU_CLR_S(cpus->map[cpu], cpu_set_size, cpu_set);
+ CPU_CLR(cpus->map[cpu], &cpu_set);
}

/*
@@ -407,6 +411,9 @@ static int test__open_syscall_event_on_all_cpus(void)
for (cpu = 0; cpu < cpus->nr; ++cpu) {
unsigned int expected;

+ if (cpus->map[cpu] >= CPU_SETSIZE)
+ continue;
+
if (perf_evsel__read_on_cpu(evsel, cpu, 0) < 0) {
pr_debug("perf_evsel__open_read_on_cpu\n");
goto out_close_fd;
@@ -425,8 +432,6 @@ out_close_fd:
perf_evsel__close_fd(evsel, 1, threads->nr);
out_evsel_delete:
perf_evsel__delete(evsel);
-out_cpu_free:
- CPU_FREE(cpu_set);
out_thread_map_delete:
thread_map__delete(threads);
return err;