linux-kernel - Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS is under heavy write load (massive starvation)

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Date:	Sun, 29 Apr 2007 23:17:10 +0200 (CEST)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS
 is under heavy write load (massive starvation)

On Sat, 28 Apr 2007, Lee Revell wrote:

> On 4/28/07, Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz> wrote:
>> I most wonder, why vim fsyncs its swapfile regularly (blocking typing
>> during that) and doesn't fsync the resulting file on :w  :-/
>
> Never seen this.  Why would fsync block typing unless vim was doing
> disk IO for every keystroke?
>
> Lee

Not for every keystroke, but after some time it calls fsync(). During 
execution of that call, keyboard is blocked. It is not normally problem 
(fsync executes very fastly), but it starts to be problem in case of 
extremely overloaded system.

Mikulas
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