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From: Daniel Micay <danielmicay-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
	Minchan Kim <minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
	Andrew Morton
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	Michael Kerrisk
	<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
	"linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org"
	<linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>,
	KOSAKI Motohiro
	<kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org>,
	"Kirill A. Shutemov"
	<kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>,
	Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
	Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Jason Evans <je-b10kYP2dOMg@public.gmane.org>,
	Shaohua Li <shli-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	yalin.wang2010-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>
Subject: Re: [PATCH v2 01/13] mm: support madvise(MADV_FREE)
Date: Wed, 4 Nov 2015 00:53:42 -0500	[thread overview]
Message-ID: <56399D66.5010606@gmail.com> (raw)
In-Reply-To: <56399CA5.8090101-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

[-- Attachment #1: Type: text/plain, Size: 905 bytes --]

> In the common case it will be passed many pages by the allocator. There
> will still be a layer of purging logic on top of MADV_FREE but it can be
> much thinner than the current workarounds for MADV_DONTNEED. So the
> allocator would still be coalescing dirty ranges and only purging when
> the ratio of dirty:clean pages rises above some threshold. It would be
> able to weight the largest ranges for purging first rather than logic
> based on stuff like aging as is used for MADV_DONTNEED.

I would expect that jemalloc would just start putting the dirty ranges
into the usual pair of red-black trees (with coalescing) and then doing
purging starting from the largest spans to get back down below whatever
dirty:clean ratio it's trying to keep. Right now, it has all lots of
other logic to deal with this since each MADV_DONTNEED call results in
lots of zeroing and then page faults.


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  parent reply	other threads:[~2015-11-04  5:53 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-04  1:25 [PATCH v2 00/13] MADV_FREE support Minchan Kim
2015-11-04  1:25 ` [PATCH v2 01/13] mm: support madvise(MADV_FREE) Minchan Kim
2015-11-04  2:29   ` Sergey Senozhatsky
2015-11-04 23:40     ` Minchan Kim
     [not found]   ` <1446600367-7976-2-git-send-email-minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-11-04  2:16     ` Sergey Senozhatsky
2015-11-04 23:39       ` Minchan Kim
2015-11-05  3:41         ` Sergey Senozhatsky
2015-11-04  3:41     ` Andy Lutomirski
2015-11-04  5:50       ` Daniel Micay
     [not found]         ` <56399CA5.8090101-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-11-04  5:53           ` Daniel Micay [this message]
2015-11-04  6:04             ` Daniel Micay
2015-11-04 18:23         ` Andy Lutomirski
2015-11-04 22:05           ` Daniel Micay
     [not found]             ` <563A813B.9080903-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-11-05 18:17               ` Shaohua Li
2015-11-05 20:13                 ` Daniel Micay
     [not found]                   ` <563BB855.6020304-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-11-05 20:14                     ` Daniel Micay
     [not found]       ` <CALCETrUuNs=26UQtkU88cKPomx_Bik9mbgUUF9q7Nmh1pQJ4qg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-11-05  0:13         ` Minchan Kim
2015-11-05  0:42           ` Andy Lutomirski
2015-11-05  0:56             ` Minchan Kim
2015-11-05  1:29               ` Andy Lutomirski
     [not found]                 ` <CALCETrWWgbPNwCr-=LF8p33H25C_aNS5vy4wd3NUap6SmrsmkA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-11-05  1:48                   ` Minchan Kim
2015-11-04 20:00     ` Shaohua Li
     [not found]       ` <20151104200006.GA46783-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-11-04 21:16         ` Daniel Micay
     [not found]           ` <563A7591.7080607-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-11-04 21:29             ` Daniel Micay
2015-11-05  1:33         ` Minchan Kim
2015-11-05  1:37           ` Minchan Kim
2015-11-04 21:43       ` Andy Lutomirski
2015-12-01 22:30       ` John Stultz
2015-11-04  1:25 ` [PATCH v2 02/13] mm: define MADV_FREE for some arches Minchan Kim
2015-11-04  1:25 ` [PATCH v2 03/13] arch: uapi: asm: mman.h: Let MADV_FREE have same value for all architectures Minchan Kim
2015-11-04  1:25 ` [PATCH v2 05/13] mm: move lazily freed pages to inactive list Minchan Kim
2015-11-04  1:26 ` [PATCH v2 06/13] mm: clear PG_dirty to mark page freeable Minchan Kim
2015-11-04  1:26 ` [PATCH v2 07/13] mm: mark stable page dirty in KSM Minchan Kim
2015-11-04  1:26 ` [PATCH v2 09/13] sparc: add pmd_[dirty|mkclean] for THP Minchan Kim
     [not found] ` <1446600367-7976-1-git-send-email-minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-11-04  1:25   ` [PATCH v2 04/13] mm: free swp_entry in madvise_free Minchan Kim
2015-11-04  1:26   ` [PATCH v2 08/13] x86: add pmd_[dirty|mkclean] for THP Minchan Kim
2015-11-04  1:26   ` [PATCH v2 10/13] powerpc: " Minchan Kim
2015-11-04  1:26 ` [PATCH v2 11/13] arm: add pmd_mkclean " Minchan Kim
2015-11-04  1:26 ` [PATCH v2 12/13] arm64: " Minchan Kim
2015-11-04  1:26 ` [PATCH v2 13/13] mm: don't split THP page when syscall is called Minchan Kim
2015-12-05 11:10 ` [PATCH v2 00/13] MADV_FREE support Pavel Machek
2015-12-05 15:51   ` Daniel Micay

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