Commit 4eed11d5 authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 86bd5e86
......@@ -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);
......
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