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perf/core: Add per perf_cpu_context min_heap storage

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The storage required for visit_groups_merge's min heap needs to vary in
order to support more iterators, such as when multiple nested cgroups'
events are being visited. This change allows for 2 iterators and doesn't
support growth.

Based-on-work-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200214075133.181299-5-irogers@google.com
This commit is contained in:
Ian Rogers 2020-02-13 23:51:31 -08:00 • committed by Ingo Molnar
parent 6eef8a7116
commit 836196beb3
2 changed files with 39 additions and 11 deletions
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7
include/linux/perf_event.h
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@ -862,6 +862,13 @@ struct perf_cpu_context {
int sched_cb_usage;
int online;
/*
* Per-CPU storage for iterators used in visit_groups_merge. The default
* storage is of size 2 to hold the CPU and any CPU event iterators.
*/
int heap_size;
struct perf_event **heap;
struct perf_event *heap_default[2];
};
struct perf_output_handle {