linux-kernel - Re: [PATCH v2] mm: vmscan: fix the page state calculation in too_many

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]

Date:	Mon, 19 Jan 2015 09:57:08 +0530
From:	Vinayak Menon <vinmenon@...eaurora.org>
To:	Christoph Lameter <cl@...ux.com>
CC:	Michal Hocko <mhocko@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	hannes@...xchg.org, vdavydov@...allels.com, mgorman@...e.de,
	minchan@...nel.org
Subject: Re: [PATCH v2] mm: vmscan: fix the page state calculation in too_many_isolated

On 01/18/2015 01:18 AM, Christoph Lameter wrote:
> On Sat, 17 Jan 2015, Vinayak Menon wrote:
>
>> which had not updated the vmstat_diff. This CPU was in idle for around 30
>> secs. When I looked at the tvec base for this CPU, the timer associated with
>> vmstat_update had its expiry time less than current jiffies. This timer had
>> its deferrable flag set, and was tied to the next non-deferrable timer in the
>
> We can remove the deferrrable flag now since the vmstat threads are only
> activated as necessary with the recent changes. Looks like this could fix
> your issue?
>

Yes, this should fix my issue.
But I think we may need the fix in too_many_isolated, since there can 
still be a delay of few seconds (HZ by default and even more because of 
reasons pointed out by Michal) which will result in reclaimers 
unnecessarily entering congestion_wait. No ?


-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a
member of the Code Aurora Forum, hosted by The Linux Foundation
--
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/