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From: Michal Hocko <mhocko@suse.cz>
To: Vinayak Menon <vinmenon@codeaurora.org>
Cc: Christoph Lameter <cl@linux.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	akpm@linux-foundation.org, hannes@cmpxchg.org,
	vdavydov@parallels.com, mgorman@suse.de, minchan@kernel.org
Subject: Re: [PATCH v2] mm: vmscan: fix the page state calculation in too_many_isolated
Date: Tue, 27 Jan 2015 11:45:11 +0100	[thread overview]
Message-ID: <20150127104511.GB19880@dhcp22.suse.cz> (raw)
In-Reply-To: <54C76995.70501@codeaurora.org>

On Tue 27-01-15 16:03:57, Vinayak Menon wrote:
[...]
> Sure, I can retest.

Thanks!

> Even without highly overloaded workqueues, there can be a delay of HZ in
> updating the counters. This means reclaim path can be blocked for a second
> or more, when there aren't really any isolated pages. So we need the fix in
> too_many_isolated also right ?

Is this a big deal though? What you are hitting is certainly a corner
case. I assume your system is trashing heavily already with so few pages
on the file LRU list.

Anyway as mentioned in other email I would rather see vmstat data more
reliable than spread hacks to the code where we see immediate issues.

-- 
Michal Hocko
SUSE Labs

  reply	other threads:[~2015-01-27 10:45 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-14 11:36 Vinayak Menon
2015-01-14 16:50 ` Michal Hocko
2015-01-15 17:24   ` Vinayak Menon
2015-01-16 15:49     ` Michal Hocko
2015-01-16 17:57       ` Michal Hocko
2015-01-16 19:17         ` Christoph Lameter
2015-01-17 15:18       ` Vinayak Menon
2015-01-17 19:48         ` Christoph Lameter
2015-01-19  4:27           ` Vinayak Menon
2015-01-21 14:39             ` Michal Hocko
2015-01-22 15:16               ` Vlastimil Babka
2015-01-22 16:11               ` Christoph Lameter
2015-01-26 17:46                 ` Michal Hocko
2015-01-26 18:35                   ` Christoph Lameter
2015-01-27 10:52                     ` Michal Hocko
2015-01-27 16:59                       ` Christoph Lameter
2015-01-30 15:28                         ` Michal Hocko
2015-01-26 17:28           ` Michal Hocko
2015-01-26 18:35             ` Christoph Lameter
2015-01-26 22:11             ` Andrew Morton
2015-01-27 10:41               ` Michal Hocko
2015-01-27 10:33             ` Vinayak Menon
2015-01-27 10:45               ` Michal Hocko [this message]
2015-01-29 17:32       ` Christoph Lameter
2015-01-30 15:27         ` Michal Hocko
2015-01-16  1:17 ` Andrew Morton
2015-01-16  5:10   ` Vinayak Menon
2015-01-17 16:29   ` Vinayak Menon
2015-02-11 22:14     ` Andrew Morton
2015-02-12 16:19       ` Vlastimil Babka

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