From: Daniel Micay <danielmicay-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>,
Minchan Kim <minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
Michael Kerrisk
<mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Mel Gorman <mgorman-l3A5Bk7waGM@public.gmane.org>,
KOSAKI Motohiro
<kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org>,
Jason Evans <je-b10kYP2dOMg@public.gmane.org>,
"Kirill A. Shutemov"
<kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>,
Shaohua Li <shli-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
yalin.wang2010-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH v2 00/13] MADV_FREE support
Date: Sat, 5 Dec 2015 10:51:58 -0500 [thread overview]
Message-ID: <5663081E.4010205@gmail.com> (raw)
In-Reply-To: <20151205111042.GA11598@amd>
[-- Attachment #1: Type: text/plain, Size: 901 bytes --]
On 05/12/15 06:10 AM, Pavel Machek wrote:
> On Wed 2015-11-04 10:25:54, Minchan Kim wrote:
>> MADV_FREE is on linux-next so long time. The reason was two, I think.
>>
>> 1. MADV_FREE code on reclaim path was really mess.
>
> Could you explain what MADV_FREE does?
>
> Comment in code says 'free the page only when there's memory
> pressure'. So I mark my caches MADV_FREE, no memory pressure, I can
> keep using it? And if there's memory pressure, what happens? I get
> zeros? SIGSEGV?
You get zeroes. It's not designed for that use case right now. It's for
malloc implementations to use internally. There would need to be a new
feature like MADV_FREE_UNDO for it to be usable for caches and it may
make more sense for that to be a separate feature entirely, i.e. have a
different flag for marking too (not sure) since it wouldn't need to
worry about whether stuff is touched.
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Micay <danielmicay@gmail.com>
To: Pavel Machek <pavel@ucw.cz>, Minchan Kim <minchan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Michael Kerrisk <mtk.manpages@gmail.com>,
linux-api@vger.kernel.org, Hugh Dickins <hughd@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Jason Evans <je@fb.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Shaohua Li <shli@kernel.org>, Michal Hocko <mhocko@suse.cz>,
yalin.wang2010@gmail.com
Subject: Re: [PATCH v2 00/13] MADV_FREE support
Date: Sat, 5 Dec 2015 10:51:58 -0500 [thread overview]
Message-ID: <5663081E.4010205@gmail.com> (raw)
In-Reply-To: <20151205111042.GA11598@amd>
[-- Attachment #1: Type: text/plain, Size: 901 bytes --]
On 05/12/15 06:10 AM, Pavel Machek wrote:
> On Wed 2015-11-04 10:25:54, Minchan Kim wrote:
>> MADV_FREE is on linux-next so long time. The reason was two, I think.
>>
>> 1. MADV_FREE code on reclaim path was really mess.
>
> Could you explain what MADV_FREE does?
>
> Comment in code says 'free the page only when there's memory
> pressure'. So I mark my caches MADV_FREE, no memory pressure, I can
> keep using it? And if there's memory pressure, what happens? I get
> zeros? SIGSEGV?
You get zeroes. It's not designed for that use case right now. It's for
malloc implementations to use internally. There would need to be a new
feature like MADV_FREE_UNDO for it to be usable for caches and it may
make more sense for that to be a separate feature entirely, i.e. have a
different flag for marking too (not sure) since it wouldn't need to
worry about whether stuff is touched.
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
next prev parent reply other threads:[~2015-12-05 15:51 UTC|newest]
Thread overview: 96+ 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 ` Minchan Kim
2015-11-04 1:25 ` [PATCH v2 01/13] mm: support madvise(MADV_FREE) Minchan Kim
2015-11-04 1:25 ` 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 2:16 ` Sergey Senozhatsky
2015-11-04 2:16 ` Sergey Senozhatsky
2015-11-04 23:39 ` Minchan Kim
2015-11-04 23:39 ` Minchan Kim
2015-11-04 23:39 ` Minchan Kim
2015-11-05 3:41 ` Sergey Senozhatsky
2015-11-05 3:41 ` Sergey Senozhatsky
2015-11-05 3:41 ` Sergey Senozhatsky
2015-11-04 3:41 ` Andy Lutomirski
2015-11-04 3:41 ` Andy Lutomirski
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
2015-11-04 5:53 ` Daniel Micay
2015-11-04 6:04 ` Daniel Micay
2015-11-04 18:23 ` Andy Lutomirski
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 18:17 ` Shaohua Li
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
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 0:13 ` Minchan Kim
2015-11-05 0:13 ` Minchan Kim
2015-11-05 0:42 ` Andy Lutomirski
2015-11-05 0:42 ` Andy Lutomirski
2015-11-05 0:56 ` Minchan Kim
2015-11-05 0:56 ` Minchan Kim
2015-11-05 1:29 ` Andy Lutomirski
2015-11-05 1:29 ` Andy Lutomirski
[not found] ` <CALCETrWWgbPNwCr-=LF8p33H25C_aNS5vy4wd3NUap6SmrsmkA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-11-05 1:48 ` Minchan Kim
2015-11-05 1:48 ` Minchan Kim
2015-11-05 1:48 ` Minchan Kim
2015-11-04 20:00 ` Shaohua Li
2015-11-04 20:00 ` Shaohua Li
2015-11-04 20:00 ` Shaohua Li
2015-11-04 21:43 ` Andy Lutomirski
2015-11-04 21:43 ` Andy Lutomirski
[not found] ` <20151104200006.GA46783-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2015-11-04 21:16 ` Daniel Micay
2015-11-04 21:16 ` Daniel Micay
[not found] ` <563A7591.7080607-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-11-04 21:29 ` Daniel Micay
2015-11-04 21:29 ` Daniel Micay
2015-11-05 1:33 ` Minchan Kim
2015-11-05 1:33 ` Minchan Kim
2015-11-05 1:33 ` Minchan Kim
2015-11-05 1:37 ` Minchan Kim
2015-11-05 1:37 ` Minchan Kim
2015-11-05 1:37 ` Minchan Kim
2015-12-01 22:30 ` John Stultz
2015-12-01 22:30 ` John Stultz
2015-11-04 2:29 ` Sergey Senozhatsky
2015-11-04 2:29 ` Sergey Senozhatsky
2015-11-04 23:40 ` Minchan Kim
2015-11-04 23:40 ` Minchan Kim
2015-11-04 23:40 ` Minchan Kim
2015-11-04 1:25 ` [PATCH v2 02/13] mm: define MADV_FREE for some arches Minchan Kim
2015-11-04 1:25 ` 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 ` Minchan Kim
2015-11-04 1:25 ` Minchan Kim
2015-11-04 1:25 ` Minchan Kim
2015-11-04 1:25 ` [PATCH v2 05/13] mm: move lazily freed pages to inactive list Minchan Kim
2015-11-04 1:25 ` 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 ` 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 ` Minchan Kim
2015-11-04 1:26 ` [PATCH v2 09/13] sparc: add pmd_[dirty|mkclean] for THP Minchan Kim
2015-11-04 1:26 ` 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 1:25 ` Minchan Kim
2015-11-04 1:25 ` 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 ` Minchan Kim
2015-11-04 1:26 ` Minchan Kim
2015-11-04 1:26 ` [PATCH v2 10/13] powerpc: " Minchan Kim
2015-11-04 1:26 ` Minchan Kim
2015-11-04 1:26 ` Minchan Kim
2015-11-04 1:26 ` [PATCH v2 11/13] arm: add pmd_mkclean " Minchan Kim
2015-11-04 1:26 ` Minchan Kim
2015-11-04 1:26 ` [PATCH v2 12/13] arm64: " Minchan Kim
2015-11-04 1:26 ` Minchan Kim
2015-11-04 1:26 ` [PATCH v2 13/13] mm: don't split THP page when syscall is called Minchan Kim
2015-11-04 1:26 ` Minchan Kim
2015-12-05 11:10 ` [PATCH v2 00/13] MADV_FREE support Pavel Machek
2015-12-05 11:10 ` Pavel Machek
2015-12-05 15:51 ` Daniel Micay [this message]
2015-12-05 15:51 ` Daniel Micay
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5663081E.4010205@gmail.com \
--to=danielmicay-re5jqeeqqe8avxtiumwx3w@public.gmane.org \
--cc=akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org \
--cc=hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org \
--cc=hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org \
--cc=je-b10kYP2dOMg@public.gmane.org \
--cc=kirill-oKw7cIdHH8eLwutG50LtGA@public.gmane.org \
--cc=kosaki.motohiro-+CUm20s59erQFUHtdCDX3A@public.gmane.org \
--cc=linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \
--cc=linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org \
--cc=mgorman-l3A5Bk7waGM@public.gmane.org \
--cc=mhocko-AlSwsSmVLrQ@public.gmane.org \
--cc=minchan-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
--cc=pavel-+ZI9xUNit7I@public.gmane.org \
--cc=riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org \
--cc=shli-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org \
--cc=yalin.wang2010-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.