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perfcounters: pull inherited counters

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Change counter inheritance from a 'push' to a 'pull' model: instead of
child tasks pushing their final counts to the parent, reuse the wait4
infrastructure to pull counters as child tasks are exit-processed,
much like how cutime/cstime is collected.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-12-19 10:20:42 +01:00
parent aa9c4c0f96
commit eef6cbf584
2 changed files with 18 additions and 12 deletions
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9
include/linux/init_task.h
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@ -113,6 +113,14 @@ extern struct group_info init_groups;
# define CAP_INIT_BSET CAP_INIT_EFF_SET
#endif
#ifdef CONFIG_PERF_COUNTERS
# define INIT_PERF_COUNTERS(tsk) \
.perf_counter_ctx.counter_list = \
LIST_HEAD_INIT(tsk.perf_counter_ctx.counter_list),
#else
# define INIT_PERF_COUNTERS(tsk)
#endif
/*
* INIT_TASK is used to set up the first task table, touch at
* your own risk!. Base=0, limit=0x1fffff (=2MB)
@ -180,6 +188,7 @@ extern struct group_info init_groups;
INIT_IDS \
INIT_TRACE_IRQFLAGS \
INIT_LOCKDEP \
INIT_PERF_COUNTERS(tsk) \
}