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From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: riel@redhat.com,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	linux-kernel@vger.kernel.org, xfs@oss.sgi.com,
	kosaki.motohiro@jp.fujitsu.com, fengguang.wu@intel.com,
	kamezawa.hiroyu@jp.fujitsu.com
Subject: Re: [PATCH] mm/vmscan: Do not block forever at shrink_inactive_list().
Date: Tue, 20 May 2014 00:20:57 -0700	[thread overview]
Message-ID: <20140520072057.GA4952@infradead.org> (raw)
In-Reply-To: <20140519225915.3370328d.akpm@linux-foundation.org>

On Mon, May 19, 2014 at 10:59:15PM -0700, Andrew Morton wrote:
> So current_is_kswapd() returns true for a thread which is not kswapd. 
> That's a bit smelly.
> 
> Should this thread really be incrementing KSWAPD_INODESTEAL instead of
> PGINODESTEAL, for example?  current_is_kswapd() does a range of things,
> only one(?) of which you actually want.

Actually we want all of them. The allocation workqueue is a workaround
for the incredible stack usage in the Linux I/O path.  If it is called
by kswapd it should act as if it were kswapd for all purposes.

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WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Chinner <david@fromorbit.com>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	riel@redhat.com, kosaki.motohiro@jp.fujitsu.com,
	fengguang.wu@intel.com, kamezawa.hiroyu@jp.fujitsu.com,
	linux-kernel@vger.kernel.org, xfs@oss.sgi.com
Subject: Re: [PATCH] mm/vmscan: Do not block forever at shrink_inactive_list().
Date: Tue, 20 May 2014 00:20:57 -0700	[thread overview]
Message-ID: <20140520072057.GA4952@infradead.org> (raw)
In-Reply-To: <20140519225915.3370328d.akpm@linux-foundation.org>

On Mon, May 19, 2014 at 10:59:15PM -0700, Andrew Morton wrote:
> So current_is_kswapd() returns true for a thread which is not kswapd. 
> That's a bit smelly.
> 
> Should this thread really be incrementing KSWAPD_INODESTEAL instead of
> PGINODESTEAL, for example?  current_is_kswapd() does a range of things,
> only one(?) of which you actually want.

Actually we want all of them. The allocation workqueue is a workaround
for the incredible stack usage in the Linux I/O path.  If it is called
by kswapd it should act as if it were kswapd for all purposes.


  parent reply	other threads:[~2014-05-20  7:21 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-19 14:40 [PATCH] mm/vmscan: Do not block forever at shrink_inactive_list() Tetsuo Handa
2014-05-19 17:42 ` Rik van Riel
2014-05-20  0:44 ` Dave Chinner
2014-05-20  0:44   ` Dave Chinner
2014-05-20  3:54   ` Tetsuo Handa
2014-05-20  3:54     ` Tetsuo Handa
2014-05-20  5:24     ` Dave Chinner
2014-05-20  5:24       ` Dave Chinner
2014-05-20  5:59   ` Andrew Morton
2014-05-20  5:59     ` Andrew Morton
2014-05-20  6:03     ` Andrew Morton
2014-05-20  6:03       ` Andrew Morton
2014-05-20  6:33       ` Dave Chinner
2014-05-20  6:33         ` Dave Chinner
2014-05-20  6:30     ` Dave Chinner
2014-05-20  6:30       ` Dave Chinner
2014-05-20 14:58       ` Tetsuo Handa
2014-05-20 14:58         ` Tetsuo Handa
2014-05-20 16:12         ` Motohiro Kosaki
2014-05-20 16:12           ` Motohiro Kosaki
2014-05-26 11:45           ` [PATCH] mm/vmscan: Do not block forever atshrink_inactive_list() Tetsuo Handa
2014-05-26 11:45             ` Tetsuo Handa
2014-06-03 21:43             ` David Rientjes
2014-06-03 21:43               ` David Rientjes
2014-06-05 12:45               ` [PATCH] mm/vmscan: Do not block forever at shrink_inactive_list() Tetsuo Handa
2014-06-05 12:45                 ` Tetsuo Handa
2014-06-05 13:17                 ` Dave Chinner
2014-06-05 13:17                   ` Dave Chinner
2014-06-06 12:19                   ` [PATCH] mm/vmscan: Do not block forever atshrink_inactive_list() Tetsuo Handa
2014-06-06 12:19                     ` Tetsuo Handa
2014-06-09 11:53                 ` [PATCH] mm/vmscan: Do not block forever at shrink_inactive_list() Tetsuo Handa
2014-06-09 11:53                   ` Tetsuo Handa
2014-07-02 12:40                   ` Tetsuo Handa
2014-05-20  7:20     ` Christoph Hellwig [this message]
2014-05-20  7:20       ` Christoph Hellwig
2014-05-20  2:35 ` Jianyu Zhan

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