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metag: perf: fix wrap handling in delta calculation

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When calculating the delta, mask with MAX_PERIOD (24 bits) to handle
wrapping, which particularly happens with periodic sampling since the
value is intentionally set so that it will overflow soon.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
This commit is contained in:
James Hogan 2013-02-27 16:16:38 +00:00
parent 3424dabb65
commit c43ca04b5e
1 changed files with 1 additions and 1 deletions
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2
arch/metag/kernel/perf/perf_event.c
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@ -211,7 +211,7 @@ again:
/*
* Calculate the delta and add it to the counter.
*/
delta = new_raw_count - prev_raw_count;
delta = (new_raw_count - prev_raw_count) & MAX_PERIOD;
local64_add(delta, &event->count);
}