All of lore.kernel.org
 help / color / mirror / Atom feed
From: Minchan Kim <minchan@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Greg Thelen <gthelen@google.com>, Mel Gorman <mgorman@suse.de>,
	Michal Nazarewicz <mina86@mina86.com>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
	Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 04/10] mm, compaction: skip rechecks when lock was already held
Date: Wed, 11 Jun 2014 10:50:20 +0900	[thread overview]
Message-ID: <20140611015020.GE15630@bbox> (raw)
In-Reply-To: <1402305982-6928-4-git-send-email-vbabka@suse.cz>

On Mon, Jun 09, 2014 at 11:26:16AM +0200, Vlastimil Babka wrote:
> Compaction scanners try to lock zone locks as late as possible by checking
> many page or pageblock properties opportunistically without lock and skipping
> them if not unsuitable. For pages that pass the initial checks, some properties
> have to be checked again safely under lock. However, if the lock was already
> held from a previous iteration in the initial checks, the rechecks are
> unnecessary.
> 
> This patch therefore skips the rechecks when the lock was already held. This is
> now possible to do, since we don't (potentially) drop and reacquire the lock
> between the initial checks and the safe rechecks anymore.
> 
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Minchan Kim <minchan@kernel.org>

-- 
Kind regards,
Minchan Kim

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

WARNING: multiple messages have this Message-ID (diff)
From: Minchan Kim <minchan@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Greg Thelen <gthelen@google.com>, Mel Gorman <mgorman@suse.de>,
	Michal Nazarewicz <mina86@mina86.com>,
	Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
	Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 04/10] mm, compaction: skip rechecks when lock was already held
Date: Wed, 11 Jun 2014 10:50:20 +0900	[thread overview]
Message-ID: <20140611015020.GE15630@bbox> (raw)
In-Reply-To: <1402305982-6928-4-git-send-email-vbabka@suse.cz>

On Mon, Jun 09, 2014 at 11:26:16AM +0200, Vlastimil Babka wrote:
> Compaction scanners try to lock zone locks as late as possible by checking
> many page or pageblock properties opportunistically without lock and skipping
> them if not unsuitable. For pages that pass the initial checks, some properties
> have to be checked again safely under lock. However, if the lock was already
> held from a previous iteration in the initial checks, the rechecks are
> unnecessary.
> 
> This patch therefore skips the rechecks when the lock was already held. This is
> now possible to do, since we don't (potentially) drop and reacquire the lock
> between the initial checks and the safe rechecks anymore.
> 
> Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Minchan Kim <minchan@kernel.org>

-- 
Kind regards,
Minchan Kim

  parent reply	other threads:[~2014-06-11  1:50 UTC|newest]

Thread overview: 88+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-09  9:26 [PATCH 01/10] mm, compaction: do not recheck suitable_migration_target under lock Vlastimil Babka
2014-06-09  9:26 ` Vlastimil Babka
2014-06-09  9:26 ` [PATCH 02/10] mm, compaction: report compaction as contended only due to lock contention Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-09 23:50   ` David Rientjes
2014-06-09 23:50     ` David Rientjes
2014-06-10  7:11     ` Vlastimil Babka
2014-06-10  7:11       ` Vlastimil Babka
2014-06-10 23:40       ` David Rientjes
2014-06-10 23:40         ` David Rientjes
2014-06-11  1:10   ` Minchan Kim
2014-06-11  1:10     ` Minchan Kim
2014-06-11 12:22     ` Vlastimil Babka
2014-06-11 12:22       ` Vlastimil Babka
2014-06-11 23:49       ` Minchan Kim
2014-06-11 23:49         ` Minchan Kim
2014-06-12 14:02         ` Vlastimil Babka
2014-06-12 14:02           ` Vlastimil Babka
2014-06-13  2:40           ` Minchan Kim
2014-06-13  2:40             ` Minchan Kim
2014-06-20 11:47             ` Vlastimil Babka
2014-06-20 11:47               ` Vlastimil Babka
2014-06-09  9:26 ` [PATCH 03/10] mm, compaction: periodically drop lock and restore IRQs in scanners Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-09 23:58   ` David Rientjes
2014-06-09 23:58     ` David Rientjes
2014-06-10  7:15     ` Vlastimil Babka
2014-06-10  7:15       ` Vlastimil Babka
2014-06-10 23:41       ` David Rientjes
2014-06-10 23:41         ` David Rientjes
2014-06-11  1:32   ` Minchan Kim
2014-06-11  1:32     ` Minchan Kim
2014-06-11 11:24     ` Vlastimil Babka
2014-06-11 11:24       ` Vlastimil Babka
2014-06-09  9:26 ` [PATCH 04/10] mm, compaction: skip rechecks when lock was already held Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-10  0:00   ` David Rientjes
2014-06-10  0:00     ` David Rientjes
2014-06-11  1:50   ` Minchan Kim [this message]
2014-06-11  1:50     ` Minchan Kim
2014-06-09  9:26 ` [PATCH 05/10] mm, compaction: remember position within pageblock in free pages scanner Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-10  0:07   ` David Rientjes
2014-06-10  0:07     ` David Rientjes
2014-06-11  2:12   ` Minchan Kim
2014-06-11  2:12     ` Minchan Kim
2014-06-11  8:16     ` Joonsoo Kim
2014-06-11  8:16       ` Joonsoo Kim
2014-06-11 11:41       ` Vlastimil Babka
2014-06-11 11:41         ` Vlastimil Babka
2014-06-11 11:33     ` Vlastimil Babka
2014-06-11 11:33       ` Vlastimil Babka
2014-06-11  3:29   ` Zhang Yanfei
2014-06-11  3:29     ` Zhang Yanfei
2014-06-09  9:26 ` [PATCH 06/10] mm, compaction: skip buddy pages by their order in the migrate scanner Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-10  0:08   ` David Rientjes
2014-06-10  0:08     ` David Rientjes
2014-06-09  9:26 ` [PATCH 07/10] mm: rename allocflags_to_migratetype for clarity Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-11  2:41   ` Minchan Kim
2014-06-11  2:41     ` Minchan Kim
2014-06-11  3:38     ` Zhang Yanfei
2014-06-11  3:38       ` Zhang Yanfei
2014-06-09  9:26 ` [PATCH 08/10] mm, compaction: pass gfp mask to compact_control Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-11  2:48   ` Minchan Kim
2014-06-11  2:48     ` Minchan Kim
2014-06-11 11:46     ` Vlastimil Babka
2014-06-11 11:46       ` Vlastimil Babka
2014-06-12  0:24       ` David Rientjes
2014-06-12  0:24         ` David Rientjes
2014-06-09  9:26 ` [RFC PATCH 09/10] mm, compaction: try to capture the just-created high-order freepage Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-11 14:56   ` Vlastimil Babka
2014-06-11 14:56     ` Vlastimil Babka
2014-06-12  2:20     ` Minchan Kim
2014-06-12  2:20       ` Minchan Kim
2014-06-12  8:21       ` Vlastimil Babka
2014-06-12  8:21         ` Vlastimil Babka
2014-06-09  9:26 ` [RFC PATCH 10/10] mm, compaction: do not migrate pages when that cannot satisfy page fault allocation Vlastimil Babka
2014-06-09  9:26   ` Vlastimil Babka
2014-06-09 23:41 ` [PATCH 01/10] mm, compaction: do not recheck suitable_migration_target under lock David Rientjes
2014-06-09 23:41   ` David Rientjes
2014-06-11  0:33 ` Minchan Kim
2014-06-11  0:33   ` Minchan Kim
2014-06-11  2:45 ` Zhang Yanfei
2014-06-11  2:45   ` Zhang Yanfei

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=20140611015020.GE15630@bbox \
    --to=minchan@kernel.org \
    --cc=akpm@linux-foundation.org \
    --cc=cl@linux.com \
    --cc=gthelen@google.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mgorman@suse.de \
    --cc=mina86@mina86.com \
    --cc=n-horiguchi@ah.jp.nec.com \
    --cc=riel@redhat.com \
    --cc=rientjes@google.com \
    --cc=vbabka@suse.cz \
    /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.