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authorArnaldo Carvalho de Melo <acme@redhat.com>2011-01-04 05:13:17 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2011-01-04 05:31:32 +0300
commit4eed11d5e24540dc133003b6e8f904cb747ac4bb (patch)
treed399f73e520d93ad0912a1c2a24d62e577d47798 /tools
parent86bd5e8603b00b06189328c6d7034d2dc434d6bb (diff)
downloadlinux-4eed11d5e24540dc133003b6e8f904cb747ac4bb.tar.xz
perf evsel: Auto allocate resources needed for some methods
While writing the first user of the routines created from the ad-hoc routines in the existing builtins I noticed that the resulting set of calls was too long, reduce it by doing some best effort allocations. Tools that need to operate on multiple threads and cpus should pre-allocate enough resources by explicitely calling the perf_evsel__alloc_{fd,counters} methods. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/evsel.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index e44be528c09f..c95267e63c5b 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -66,6 +66,9 @@ int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
if (FD(evsel, cpu, thread) < 0)
return -EINVAL;
+ if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
+ return -ENOMEM;
+
if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
return -errno;
@@ -129,6 +132,9 @@ int perf_evsel__open_per_cpu(struct perf_evsel *evsel, struct cpu_map *cpus)
{
int cpu;
+ if (evsel->fd == NULL && perf_evsel__alloc_fd(evsel, cpus->nr, 1) < 0)
+ return -1;
+
for (cpu = 0; cpu < cpus->nr; cpu++) {
FD(evsel, cpu, 0) = sys_perf_event_open(&evsel->attr, -1,
cpus->map[cpu], -1, 0);
@@ -150,6 +156,9 @@ int perf_evsel__open_per_thread(struct perf_evsel *evsel, struct thread_map *thr
{
int thread;
+ if (evsel->fd == NULL && perf_evsel__alloc_fd(evsel, 1, threads->nr))
+ return -1;
+
for (thread = 0; thread < threads->nr; thread++) {
FD(evsel, 0, thread) = sys_perf_event_open(&evsel->attr,
threads->map[thread], -1, -1, 0);