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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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27
include/linux/perf_event.h
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@@ -549,7 +549,10 @@ struct hw_perf_event {
struct perf_event;
#define PERF_EVENT_TXN_STARTED 1
/*
* Common implementation detail of pmu::{start,commit,cancel}_txn
*/
#define PERF_EVENT_TXN 0x1
/**
* struct pmu - generic performance monitoring unit
@@ -563,14 +566,28 @@ struct pmu {
void (*unthrottle) (struct perf_event *event);
/*
* group events scheduling is treated as a transaction,
* add group events as a whole and perform one schedulability test.
* If test fails, roll back the whole group
* Group events scheduling is treated as a transaction, add group
* events as a whole and perform one schedulability test. If the test
* fails, roll back the whole group
*/
/*
* Start the transaction, after this ->enable() doesn't need
* to do schedulability tests.
*/
void (*start_txn) (const struct pmu *pmu);
void (*cancel_txn) (const struct pmu *pmu);
/*
* If ->start_txn() disabled the ->enable() schedulability test
* then ->commit_txn() is required to perform one. On success
* the transaction is closed. On error the transaction is kept
* open until ->cancel_txn() is called.
*/
int (*commit_txn) (const struct pmu *pmu);
/*
* Will cancel the transaction, assumes ->disable() is called for
* each successfull ->enable() during the transaction.
*/
void (*cancel_txn) (const struct pmu *pmu);
};
/**