metag: perf: don't reset TXTACTCYC

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The thread active cycle counter TXTACTCYC is used in __delay so it
shouldn't really be reset to zero by perf. Fix perf to just read the
value, and instead of clearing it, record the prev_count value in
enable_counter so that the delta calculations know about the previous
value.

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 21:54:51 +00:00

parent 9344de1b1c

commit 1fb4dc5c39

1 changed files with 2 additions and 5 deletions

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arch/metag/kernel/perf/perf_event.c

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