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perf evsel: Introduce per cpu and per thread open helpers

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Abstracting away the loops needed to create the various event fd handlers.

The users have to pass a confiruged perf->evsel.attr field, which is already
usable after perf_evsel__new (constructor) time, using defaults.

Comes out of the ad-hoc routines in builtin-stat, that now uses it.

Fixed a small silly bug where we were die()ing before killing our
children, dysfunctional family this one 8-)

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>
This commit is contained in:
Arnaldo Carvalho de Melo
2011-01-03 17:48:12 -02:00
parent c52b12ed25
commit 48290609c0
3 changed files with 82 additions and 57 deletions
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52
tools/perf/util/evsel.c
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@@ -1,4 +1,5 @@
#include "evsel.h"
#include "../perf.h"
#include "util.h"
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
@@ -121,3 +122,54 @@ int __perf_evsel__read(struct perf_evsel *evsel,
return 0;
}
int perf_evsel__open_per_cpu(struct perf_evsel *evsel, int ncpus, int *cpu_map)
{
int cpu;
for (cpu = 0; cpu < ncpus; cpu++) {
FD(evsel, cpu, 0) = sys_perf_event_open(&evsel->attr, -1,
cpu_map[cpu], -1, 0);
if (FD(evsel, cpu, 0) < 0)
goto out_close;
}
return 0;
out_close:
while (--cpu >= 0) {
close(FD(evsel, cpu, 0));
FD(evsel, cpu, 0) = -1;
}
return -1;
}
int perf_evsel__open_per_thread(struct perf_evsel *evsel, int nthreads, int *thread_map)
{
int thread;
for (thread = 0; thread < nthreads; thread++) {
FD(evsel, 0, thread) = sys_perf_event_open(&evsel->attr,
thread_map[thread], -1, -1, 0);
if (FD(evsel, 0, thread) < 0)
goto out_close;
}
return 0;
out_close:
while (--thread >= 0) {
close(FD(evsel, 0, thread));
FD(evsel, 0, thread) = -1;
}
return -1;
}
int perf_evsel__open(struct perf_evsel *evsel, int ncpus, int nthreads,
int *cpu_map, int *thread_map)
{
if (nthreads < 0)
return perf_evsel__open_per_cpu(evsel, ncpus, cpu_map);
return perf_evsel__open_per_thread(evsel, nthreads, thread_map);
}