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Date: Mon, 25 Nov 2013 16:57:29 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Johannes Weiner <hannes@...xchg.org> Cc: Dave Chinner <david@...morbit.com>, Rik van Riel <riel@...hat.com>, Jan Kara <jack@...e.cz>, Vlastimil Babka <vbabka@...e.cz>, Peter Zijlstra <peterz@...radead.org>, Tejun Heo <tj@...nel.org>, Andi Kleen <andi@...stfloor.org>, Andrea Arcangeli <aarcange@...hat.com>, Greg Thelen <gthelen@...gle.com>, Christoph Hellwig <hch@...radead.org>, Hugh Dickins <hughd@...gle.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan.kim@...il.com>, Michel Lespinasse <walken@...gle.com>, Seth Jennings <sjenning@...ux.vnet.ibm.com>, Roman Gushchin <klamm@...dex-team.ru>, Ozgun Erdogan <ozgun@...usdata.com>, Metin Doslu <metin@...usdata.com>, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [patch 0/9] mm: thrash detection-based file cache sizing v6 On Sun, 24 Nov 2013 18:38:19 -0500 Johannes Weiner <hannes@...xchg.org> wrote: > This series solves the problem by maintaining a history of pages > evicted from the inactive list, enabling the VM to detect frequently > used pages regardless of inactive list size and facilitate working set > transitions. It's a very readable patchset - thanks for taking the time to do that. > 31 files changed, 1253 insertions(+), 401 deletions(-) It's also a *ton* of stuff. More code complexity, larger kernel data structures. All to address a quite narrow class of workloads on a relatively small window of machine sizes. How on earth do we decide whether it's worth doing? Also, what's the memcg angle? This is presently a global thing - do you think we're likely to want to make it per-memcg in the future? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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