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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-04-06 11:45:13 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-04-07 10:49:01 +0200 |
commit | bce379bf358738ab8efc8cda2594a299ac685085 (patch) | |
tree | 0840adf32eefc15c5c07e7487c192fd270643057 /drivers/leds/ledtrig-heartbeat.c | |
parent | 849691a6cd40270ff5f4a8846d5f6bf8df663ffc (diff) |
perf_counter: minimize context time updates
Push the update_context_time() calls up the stack so that we get less
invokations and thereby a less noisy output:
before:
# ./perfstat -e 1:0 -e 1:1 -e 1:1 -e 1:1 -l ls > /dev/null
Performance counter stats for 'ls':
10.163691 cpu clock ticks (msecs) (scaled from 98.94%)
10.215360 task clock ticks (msecs) (scaled from 98.18%)
10.185549 task clock ticks (msecs) (scaled from 98.53%)
10.183581 task clock ticks (msecs) (scaled from 98.71%)
Wall-clock time elapsed: 11.912858 msecs
after:
# ./perfstat -e 1:0 -e 1:1 -e 1:1 -e 1:1 -l ls > /dev/null
Performance counter stats for 'ls':
9.316630 cpu clock ticks (msecs)
9.280789 task clock ticks (msecs)
9.280789 task clock ticks (msecs)
9.280789 task clock ticks (msecs)
Wall-clock time elapsed: 9.574872 msecs
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090406094518.618876874@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/leds/ledtrig-heartbeat.c')
0 files changed, 0 insertions, 0 deletions