* [RELEASE] ltt-control 0.85, lighter page cache use
@ 2010-05-19 22:00 Mathieu Desnoyers
2010-05-20 2:11 ` [RELEASE] ltt-control 0.86, better streaming fadvise Mathieu Desnoyers
0 siblings, 1 reply; 2+ messages in thread
From: Mathieu Desnoyers @ 2010-05-19 22:00 UTC (permalink / raw)
To: ltt-dev; +Cc: linux-kernel
Hi,
I just released ltt-control 0.85 which waits for previous subbuffers to be
written to disk (using sync_file_range()) and uses fadvise to tell the kernel
that pages won't be reaccessed. This lessens the tracer impact on the page
cache.
Thanks to Linus for hints on how to use fadvise and sync_file_range to do
this, c.f.:
http://marc.info/?l=linux-kernel&m=127430576309253&w=2
Mathieu
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [RELEASE] ltt-control 0.86, better streaming fadvise
2010-05-19 22:00 [RELEASE] ltt-control 0.85, lighter page cache use Mathieu Desnoyers
@ 2010-05-20 2:11 ` Mathieu Desnoyers
0 siblings, 0 replies; 2+ messages in thread
From: Mathieu Desnoyers @ 2010-05-20 2:11 UTC (permalink / raw)
To: ltt-dev; +Cc: linux-kernel
A discussion follow-up with Linus made me change the implementation to put the
fadvise after the synchronous page writeback, to ensure better streaming
behavior.
Mathieu
* Mathieu Desnoyers (mathieu.desnoyers@efficios.com) wrote:
> Hi,
>
> I just released ltt-control 0.85 which waits for previous subbuffers to be
> written to disk (using sync_file_range()) and uses fadvise to tell the kernel
> that pages won't be reaccessed. This lessens the tracer impact on the page
> cache.
>
> Thanks to Linus for hints on how to use fadvise and sync_file_range to do
> this, c.f.:
>
> http://marc.info/?l=linux-kernel&m=127430576309253&w=2
>
> Mathieu
>
> --
> Mathieu Desnoyers
> Operating System Efficiency R&D Consultant
> EfficiOS Inc.
> http://www.efficios.com
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
^ permalink raw reply [flat|nested] 2+ messages in thread
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