Messages in this thread | | | From | Satoru Moriya <> | Date | Wed, 12 Oct 2011 17:08:57 -0400 | Subject | RE: [PATCH -v2 -mm] add extra free kbytes tunable |
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On 10/11/2011 04:54 PM, Andrew Morton wrote: > On Tue, 11 Oct 2011 16:23:22 -0400 > Satoru Moriya <satoru.moriya@hds.com> 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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