linux-kernel - Re: [PATCH V2] Test compaction of mlocked memory

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Date:	Thu, 23 Apr 2015 14:41:34 -0400
From:	Eric B Munson <emunson@...mai.com>
To:	Sri Jayaramappa <sjayaram@...mai.com>
Cc:	Shuah Khan <shuahkh@....samsung.com>, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH V2] Test compaction of mlocked memory

On Thu, 23 Apr 2015, Sri Jayaramappa wrote:

> Commit commit 5bbe3547aa3b ("mm: allow compaction of unevictable pages")
> introduced a sysctl that allows userspace to enable scanning of locked
> pages for compaction.  This patch introduces a new test which fragments
> main memory and attempts to allocate a number of huge pages to exercise
> this compaction logic.
> 
> Tested on machines with up to 32 GB RAM. With the patch a much larger
> number of huge pages can be allocated than on the kernel without the
> patch.
> 
> Example output:
> On a machine with 16 GB RAM:
> sudo make run_tests vm
> ...
> -----------------------
> running compaction_test
> -----------------------
> No of huge pages allocated = 3834
> [PASS]
> ...
> 
> Signed-off-by: Sri Jayaramappa <sjayaram@...mai.com>
> Cc: linux-kernel@...r.kernel.org
> Cc: linux-api@...r.kernel.org
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Eric B Munson <emunson@...mai.com>

Reviewed-by: Eric B Munson <emunson@...mai.com>


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