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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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14
arch/x86/kernel/cpu/perf_event.c
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@@ -969,7 +969,7 @@ static int x86_pmu_enable(struct perf_event *event)
* skip the schedulability test here, it will be peformed
* at commit time(->commit_txn) as a whole
*/
if (cpuc->group_flag & PERF_EVENT_TXN_STARTED)
if (cpuc->group_flag & PERF_EVENT_TXN)
goto out;
ret = x86_pmu.schedule_events(cpuc, n, assign);
@@ -1096,7 +1096,7 @@ static void x86_pmu_disable(struct perf_event *event)
* The events never got scheduled and ->cancel_txn will truncate
* the event_list.
*/
if (cpuc->group_flag & PERF_EVENT_TXN_STARTED)
if (cpuc->group_flag & PERF_EVENT_TXN)
return;
x86_pmu_stop(event);
@@ -1388,7 +1388,7 @@ static void x86_pmu_start_txn(const struct pmu *pmu)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
cpuc->group_flag |= PERF_EVENT_TXN_STARTED;
cpuc->group_flag |= PERF_EVENT_TXN;
cpuc->n_txn = 0;
}
@@ -1401,7 +1401,7 @@ static void x86_pmu_cancel_txn(const struct pmu *pmu)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
cpuc->group_flag &= ~PERF_EVENT_TXN_STARTED;
cpuc->group_flag &= ~PERF_EVENT_TXN;
/*
* Truncate the collected events.
*/
@@ -1435,11 +1435,7 @@ static int x86_pmu_commit_txn(const struct pmu *pmu)
*/
memcpy(cpuc->assign, assign, n*sizeof(int));
/*
* Clear out the txn count so that ->cancel_txn() which gets
* run after ->commit_txn() doesn't undo things.
*/
cpuc->n_txn = 0;
cpuc->group_flag &= ~PERF_EVENT_TXN;
return 0;
}