linux-kernel - Re: [PATCH] mm: count only reclaimable lru pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20090716092129.1dbb0138@jbarnes-g45>
Date:	Thu, 16 Jul 2009 09:21:29 -0700
From:	Jesse Barnes <jesse.barnes@...el.com>
To:	"Wu, Fengguang" <fengguang.wu@...el.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Howells <dhowells@...hat.com>,
	"riel@...hat.com" <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"elladan@...imo.com" <elladan@...imo.com>,
	"npiggin@...e.de" <npiggin@...e.de>
Subject: Re: [PATCH] mm: count only reclaimable lru pages

On Thu, 16 Jul 2009 06:34:55 -0700
"Wu, Fengguang" <fengguang.wu@...el.com> wrote:

> global_lru_pages() / zone_lru_pages() can be used in two ways:
> - to estimate max reclaimable pages in determine_dirtyable_memory()  
> - to calculate the slab scan ratio
> 
> When swap is full or not present, the anon lru lists are not
> reclaimable and thus won't be scanned. So the anon pages shall not be
> counted. Also rename the function names to reflect the new meaning.
> 
> It can greatly (and correctly) increase the slab scan rate under high
> memory pressure (when most file pages have been reclaimed and swap is
> full/absent), thus avoid possible false OOM kills.
> 
> Cc: Minchan Kim <minchan.kim@...il.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
>  include/linux/vmstat.h |   11 +--------
>  mm/page-writeback.c    |    5 ++--
>  mm/vmscan.c            |   44 +++++++++++++++++++++++++++++----------
>  3 files changed, 38 insertions(+), 22 deletions(-)
> 

Looks nice to me, including the naming.  FWIW (given that it's been
years since I did any serious VM work):

Reviewed-by: Jesse Barnes <jbarnes@...tuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center
--
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/