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From: Rik van Riel <riel@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Minchan Kim <minchan@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Michal Hocko <mhocko@suse.cz>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Mel Gorman <mgorman@suse.de>, Shaohua Li <shli@kernel.org>,
	Yalin.Wang@sonymobile.com, Hugh Dickins <hughd@google.com>,
	Cyrill Gorcunov <gorcunov@gmail.com>,
	Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [PATCH 4/4] mm: make every pte dirty on do_swap_page
Date: Thu, 09 Apr 2015 20:14:28 -0400	[thread overview]
Message-ID: <552715E4.2080100@redhat.com> (raw)
In-Reply-To: <20150409135939.bbc9025d925de9d0fdd12797@linux-foundation.org>

On 04/09/2015 04:59 PM, Andrew Morton wrote:
> On Thu, 9 Apr 2015 08:50:25 +0900 Minchan Kim <minchan@kernel.org> wrote:
> 
>> Bump.
> 
> I'm getting the feeling that MADV_FREE is out of control.
> 
> Below is the overall rollup of
> 
> mm-support-madvisemadv_free.patch
> mm-support-madvisemadv_free-fix.patch
> mm-support-madvisemadv_free-fix-2.patch
> mm-dont-split-thp-page-when-syscall-is-called.patch
> mm-dont-split-thp-page-when-syscall-is-called-fix.patch
> mm-dont-split-thp-page-when-syscall-is-called-fix-2.patch
> mm-free-swp_entry-in-madvise_free.patch
> mm-move-lazy-free-pages-to-inactive-list.patch
> mm-move-lazy-free-pages-to-inactive-list-fix.patch
> mm-move-lazy-free-pages-to-inactive-list-fix-fix.patch
> mm-move-lazy-free-pages-to-inactive-list-fix-fix-fix.patch
> mm-make-every-pte-dirty-on-do_swap_page.patch
> 
> 
> It's pretty large and has its sticky little paws in all sorts of places.
> 
> 
> The feature would need to be pretty darn useful to justify a mainline
> merge.  Has any such usefulness been demonstrated?

The performance increase of MADV_FREE over MADV_DONTNEED is
quite significant. I suspect this is especially important for
mobile devices, which are more memory starved than desktop
systems and servers.

-- 
All rights reversed

  parent reply	other threads:[~2015-04-10  0:14 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-11  1:20 [PATCH 1/4] mm: free swp_entry in madvise_free Minchan Kim
2015-03-11  1:20 ` [PATCH 2/4] mm: change deactivate_page with deactivate_file_page Minchan Kim
2015-03-11  1:20 ` [PATCH 3/4] mm: move lazy free pages to inactive list Minchan Kim
2015-03-11  2:14   ` Wang, Yalin
2015-03-11  4:30     ` Minchan Kim
2015-04-01 20:38     ` Rik van Riel
2015-03-11  9:05   ` [RFC ] mm: don't ignore file map pages for madvise_free( ) Wang, Yalin
2015-03-11  9:47   ` [RFC] mm:do recheck for freeable page in reclaim path Wang, Yalin
2015-03-20 22:43   ` [PATCH 3/4] mm: move lazy free pages to inactive list Andrew Morton
2015-03-30  5:35     ` Minchan Kim
2015-03-30 21:20       ` Andrew Morton
2015-03-31  4:45         ` Minchan Kim
2015-03-31  5:28           ` Andrew Morton
2015-03-31  5:57             ` Minchan Kim
2015-03-11  1:20 ` [PATCH 4/4] mm: make every pte dirty on do_swap_page Minchan Kim
2015-03-30  5:22   ` Minchan Kim
2015-03-30  8:51     ` Cyrill Gorcunov
2015-03-30  8:59       ` Minchan Kim
2015-03-30 21:14         ` Cyrill Gorcunov
2015-03-31  4:38           ` Minchan Kim
2015-04-08 23:50   ` Minchan Kim
2015-04-09 20:59     ` Andrew Morton
2015-04-10  0:08       ` Minchan Kim
2015-04-10  0:14       ` Rik van Riel [this message]
2015-04-11 21:40   ` Hugh Dickins
2015-04-12 14:48     ` Minchan Kim
2015-04-15  6:49       ` Minchan Kim
2015-03-19  0:46 ` [PATCH 1/4] mm: free swp_entry in madvise_free Minchan Kim

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