linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <548B897C.8090803@oracle.com>
Date:	Fri, 12 Dec 2014 19:34:04 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: frequent lockups in 3.18rc4

On 12/12/2014 07:23 PM, Linus Torvalds wrote:
> On Fri, Dec 12, 2014 at 3:54 PM, Sasha Levin <sasha.levin@...cle.com> wrote:
>> >
>> > I ran bisection on trinity, rather than the kernel, and got the following
>> > result:
> Heh. That commit is pretty small, but I guess the effect of having a
> number of regular files open and being used on the trinity loads can
> be almost arbitrarily large.
> 
> Where do those files get opened? What filesystem?

Right, it's virtio-9p. However, virtio-9p acts merely as a proxy to an underlying
tmpfs - so while it's slow, I don't think it's way slower than the average disk
backed ext4.


Thanks,
Sasha
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