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Date: Mon, 5 Nov 2012 15:54:43 -0800 From: Arun Sharma <asharma@...com> To: KOSAKI Motohiro <kosaki.motohiro@...il.com> Cc: Paul Turner <pjt@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Minchan Kim <minchan@...nel.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, John Stultz <john.stultz@...aro.org>, Christoph Lameter <cl@...ux.com>, Android Kernel Team <kernel-team@...roid.com>, Robert Love <rlove@...gle.com>, Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>, Dave Hansen <dave@...ux.vnet.ibm.com>, Rik van Riel <riel@...hat.com>, Dave Chinner <david@...morbit.com>, Neil Brown <neilb@...e.de>, Mike Hommey <mh@...ndium.org>, Taras Glek <tglek@...illa.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, sanjay@...gle.com, David Rientjes <rientjes@...gle.com> Subject: Re: [RFC v2] Support volatile range for anon vma On Wed, Oct 31, 2012 at 06:56:05PM -0400, KOSAKI Motohiro wrote: > glibc malloc discard freed memory by using MADV_DONTNEED > as tcmalloc. and it is often a source of large performance decrease. > because of MADV_DONTNEED discard memory immediately and > right after malloc() call fall into page fault and pagesize memset() path. > then, using DONTNEED increased zero fill and cache miss rate. The memcg based solution that I posted a few months ago is working well for us. We see significantly less cpu in zero'ing pages. Not everyone was comfortable with the security implications of recycling pages between processes in a memcg, although it was disabled by default and had to be explicitly opted-in. Also, memory allocators have a second motivation in using madvise: to create virtually contiguous regions of memory from a fragmented address space, without increasing the RSS. -Arun -- 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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