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timer_stats/doc: Fix /proc/timer_stats documentation 

Documentation/timers/timer_stats.txt claims:

 "The readout of /proc/timer_stats automatically disables sampling. The sampled
  information is kept until a new sample period is started. This allows multiple
  readouts."

Some simple testing shows that reading from /proc/timer_stats
does not disable sampling. Looking back over past source code,
it appears that it never did.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Link: http://lkml.kernel.org/r/53636FB6.9060407@gmail.com
[ Small tidyup of the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Michael Kerrisk 2014-05-02 12:13:10 +02:00 committed by Ingo Molnar
parent 0384dcae2b
commit 2779ac167b
1 changed files with 3 additions and 3 deletions
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6
Documentation/timers/timer_stats.txt
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@ -39,9 +39,9 @@ To stop a sample period issue:
The statistics can be retrieved by:
# cat /proc/timer_stats
The readout of /proc/timer_stats automatically disables sampling. The sampled
information is kept until a new sample period is started. This allows multiple
readouts.
While sampling is enabled, each readout from /proc/timer_stats will see
newly updated statistics. Once sampling is disabled, the sampled information
is kept until a new sample period is started. This allows multiple readouts.
Sample output of /proc/timer_stats: