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perf core: Allocate perf_event in the target node memory 

For cpu events, it'd better allocating them in the corresponding node
memory as they would be mostly accessed by the target cpu.  Although
perf tools sets the cpu affinity before calling perf_event_open, there
are places it doesn't (notably perf record) and we should consider
other external users too.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210311115413.444407-2-namhyung@kernel.org
This commit is contained in:
Namhyung Kim 2021-03-11 20:54:13 +09:00 committed by Peter Zijlstra
parent bdacfaf26d
commit ff65338e78
1 changed files with 4 additions and 1 deletions
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5
kernel/events/core.c
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@ -11288,13 +11288,16 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
struct perf_event *event;
struct hw_perf_event *hwc;
long err = -EINVAL;
int node;
if ((unsigned)cpu >= nr_cpu_ids) {
if (!task || cpu != -1)
return ERR_PTR(-EINVAL);
}
event = kmem_cache_zalloc(perf_event_cache, GFP_KERNEL);
node = (cpu >= 0) ? cpu_to_node(cpu) : -1;
event = kmem_cache_alloc_node(perf_event_cache, GFP_KERNEL | __GFP_ZERO,
node);
if (!event)
return ERR_PTR(-ENOMEM);