[patch] timer_stats, doc: Readout of /proc/timer_stats doesn't disable sampling

[patch] timer_stats, doc: Readout of /proc/timer_stats doesn't disable sampling

[Michael Kerrisk (man-pages)]

From: Michael Kerrisk <mtk.manpages@gmail.com>

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>


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/

Re: [patch] timer_stats, doc: Readout of /proc/timer_stats doesn't disable sampling

[Michael Kerrisk]

Sorry -- fatfingered in Thunderbird. Proper patch on its way shortly.

On Fri, May 2, 2014 at 11:29 AM, Michael Kerrisk (man-pages)
<mtk.manpages@gmail.com> wrote:
> From: Michael Kerrisk <mtk.manpages@gmail.com>
>
> 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>
>
>
> --
> Michael Kerrisk
> Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
> Linux/UNIX System Programming Training: http://man7.org/training/
> --
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-- 
Michael Kerrisk Linux man-pages maintainer;
http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface", http://blog.man7.org/

[patch] timer_stats, doc: Readout of /proc/timer_stats doesn't disable sampling

[Michael Kerrisk (man-pages)]

From: Michael Kerrisk <mtk.manpages@gmail.com>

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>
---
 Documentation/timers/timer_stats.txt | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/timers/timer_stats.txt b/Documentation/timers/timer_stats.txt
index 8abd40b..de835ee 100644
--- a/Documentation/timers/timer_stats.txt
+++ b/Documentation/timers/timer_stats.txt
@@ -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:
 
-- 
1.9.0