RE: [PATCH -v2 -mm] add extra free kbytes tunable

[Satoru Moriya]

On 10/11/2011 04:54 PM, Andrew Morton wrote:
> On Tue, 11 Oct 2011 16:23:22 -0400
> Satoru Moriya <satoru.moriya@xxxxxxx> wrote:
>
>> Also, if we increase the free-page reserves a.k.a min_free_kbytes, 
>> the possibility of direct reclaim on other workloads increases.
>> I think it's a bad side effect.
> 
> extra_free_kbytes has the same side-effect.

I don't think so. If we make low watermark bigger to increase
free-page reserves by extra_free_kbytes, the possibility of
direct reclaim on other workload does not increase directly
because min watermark is not changed. 
Of course, as David pointed out, other workloads may incur
a regression because kswapd uses more cpu time.

Thanks,
Satoru
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