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perf: Cleanup {start,commit,cancel}_txn details

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Clarify some of the transactional group scheduling API details
and change it so that a successfull ->commit_txn also closes
the transaction.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1274803086.5882.1752.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-05-25 17:49:05 +02:00
committed by Ingo Molnar
parent 3af9e85928
commit 8d2cacbbb8
5 changed files with 36 additions and 28 deletions
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9
kernel/perf_event.c
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@@ -675,7 +675,6 @@ group_sched_in(struct perf_event *group_event,
struct perf_event *event, *partial_group = NULL;
const struct pmu *pmu = group_event->pmu;
bool txn = false;
int ret;
if (group_event->state == PERF_EVENT_STATE_OFF)
return 0;
@@ -703,15 +702,9 @@ group_sched_in(struct perf_event *group_event,
}
}
if (!txn)
if (!txn || !pmu->commit_txn(pmu))
return 0;
ret = pmu->commit_txn(pmu);
if (!ret) {
pmu->cancel_txn(pmu);
return 0;
}
group_error:
/*
* Groups can be scheduled in as one unit only, so undo any