[RELEASE] ltt-control 0.85, lighter page cache use

[RELEASE] ltt-control 0.85, lighter page cache use

[Mathieu Desnoyers]

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

Re: [RELEASE] ltt-control 0.86, better streaming fadvise

[Mathieu Desnoyers]

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