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Date:	Fri, 12 Dec 2014 19:34:04 -0500
From:	Sasha Levin <>
To:	Linus Torvalds <>
CC:	Dave Jones <>, Chris Mason <>,
	Mike Galbraith <>,
	Ingo Molnar <>,
	Peter Zijlstra <>,
	Dâniel Fraga <>,
	"Paul E. McKenney" <>,
	Linux Kernel Mailing List <>
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 <> 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.

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