linux-kernel - Re: Chronic resource starvation.

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Message-ID: <1326694076.6446.166.camel@marge.simson.net>
Date:	Mon, 16 Jan 2012 07:07:56 +0100
From:	Mike Galbraith <efault@....de>
To:	Mike Mestnik <cheako@...emestnik.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Chronic resource starvation.

On Sun, 2012-01-15 at 23:43 -0600, Mike Mestnik wrote:

> Does fdatasync still cause this problem?  I'm sure there must be
> some way to 'group' applications together that should be allowed to
> avoid this effect and even insert IO requests during the operation if
> given a high enough priority.

And btw, that resource prioritization exists now for both CPU and IO
resources, look into cgroups and ionice for non-cgroup IO.  For the CPU
scheduler, you can automate task grouping by enabling SCHED_AUTOGROUP,
and some distros use a userland automation solution via systemd.  I
don't know if systemd does IO group automation, but groups won't help
defective spinning media anyway.

	-Mike

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