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Date: Wed, 18 Jan 2017 10:26:34 +0100 From: Vlastimil Babka <vbabka@...e.cz> To: Hillf Danton <hillf.zj@...baba-inc.com>, 'Mel Gorman' <mgorman@...hsingularity.net>, 'Ganapatrao Kulkarni' <gpkulkarni@...il.com> Cc: 'Michal Hocko' <mhocko@...nel.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [RFC 3/4] mm, page_alloc: move cpuset seqcount checking to slowpath On 01/18/2017 08:22 AM, Hillf Danton wrote: > On Wednesday, January 18, 2017 6:16 AM Vlastimil Babka wrote: >> >> This is a preparation for the following patch to make review simpler. While >> the primary motivation is a bug fix, this could also save some cycles in the >> fast path. >> > This also gets kswapd involved. > Dunno how frequent cpuset is changed in real life. I don't think the extra kswapd wakeups due to retry_cpuset would be noticeable. Such frequent cpuset changes would likely have their own associated overhead larger than the wakeups. > > Hillf >
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