linux-kernel - Re: [PATCH] mm,vmscan: Use accurate values for zone

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: <20151022224701.GA5442@mtj.duckdns.org>
Date:	Fri, 23 Oct 2015 07:47:01 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	mhocko@...nel.org, cl@...ux.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	rientjes@...gle.com, oleg@...hat.com, kwalker@...hat.com,
	akpm@...ux-foundation.org, hannes@...xchg.org,
	vdavydov@...allels.com, skozina@...hat.com, mgorman@...e.de,
	riel@...hat.com
Subject: Re: [PATCH] mm,vmscan: Use accurate values for
 zone_reclaimable()checks

Hello,

On Fri, Oct 23, 2015 at 06:42:43AM +0900, Tetsuo Handa wrote:
> Then, isn't below change easier to backport which will also alleviate
> needlessly burning CPU cycles?
> 
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3385,6 +3385,7 @@ retry:
>  	((gfp_mask & __GFP_REPEAT) && pages_reclaimed < (1 << order))) {
>  		/* Wait for some write requests to complete then retry */
>  		wait_iff_congested(ac->preferred_zone, BLK_RW_ASYNC, HZ/50);
> +		schedule_timeout_uninterruptible(1);
>  		goto retry;
>  	}

Yeah, that works too.  It should still be put on a dedicated wq with
MEM_RECLAIM tho.

Thanks.

-- 
tejun
--
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/