From 4eed11d5e24540dc133003b6e8f904cb747ac4bb Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 4 Jan 2011 00:13:17 -0200 Subject: 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 Cc: Ingo Molnar Cc: Mike Galbraith Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Tom Zanussi LKML-Reference: Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evsel.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'tools/perf/util/evsel.c') 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); -- cgit v1.2.1