Re: [patch] mm: more likely reclaim MADV_SEQUENTIAL mappings II

[Johannes Weiner <hannes@saeurebad.de>]

Andrew Morton <akpm@linux-foundation.org> writes:

> On Tue, 21 Oct 2008 13:33:45 +0200
> Johannes Weiner <hannes@saeurebad.de> wrote:
>
>> File pages mapped only in sequentially read mappings are perfect
>> reclaim canditates.
>> 
>> This makes MADV_SEQUENTIAL mappings behave like a weak references,
>> their pages will be reclaimed unless they have a strong reference from
>> a normal mapping as well.
>> 
>> The patch changes the reclaim and the unmap path where they check if
>> the page has been referenced.  In both cases, accesses through
>> sequentially read mappings will be ignored.
>> 
>> Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
>> ---
>> II: add likely()s to mitigate the extra branches a bit as to Nick's
>>     suggestion
>
> Is http://hannes.saeurebad.de/madvseq/ still true with this version?

No, sorry, still running benchmarks on this version.  Coming up soon...

	Hannes

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