Re: [PATCH V2] Test compaction of mlocked memory

[Eric B Munson]

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@xxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Cc: linux-api@xxxxxxxxxxxxxxx
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Eric B Munson <emunson@xxxxxxxxxx>

Reviewed-by: Eric B Munson <emunson@xxxxxxxxxx>

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