linux-kernel - Re: Conveying memory pressure to userspace?

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Date:	Fri, 11 May 2007 13:48:52 -0700
From:	Paul Jackson <pj@....com>
To:	Christoph Lameter <clameter@....com>
Cc:	bas.westerbaan@...il.com, linux-kernel@...r.kernel.org
Subject: Re: Conveying memory pressure to userspace?

Christoph wrote:
> cpusets export a notion of memory pressure to user space. See the cpusets 
> documentation.

If the special cpuset file 'memory_pressure_enabled' is turned on (echo
'1' to it) in the top cpuset, then the special cpuset file
'memory_pressure' that is in all cpusets provides a measure of the rate
of recent page allocation requests by tasks in each cpuset that were
not easily granted off the free list, requiring more aggressive kernel
effort to free up some pages to meet the request.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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