linux-kernel - Re: Hang on large copy_from_user with PREEMPT

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Message-ID: <20150407143009.GG7935@dhcp22.suse.cz>
Date:	Tue, 7 Apr 2015 16:30:09 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Dave Jones <davej@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Hang on large copy_from_user with PREEMPT_NONE

On Tue 07-04-15 13:05:31, Ingo Molnar wrote:
> 
> * Borislav Petkov <bp@...en8.de> wrote:
> 
> > On Tue, Apr 07, 2015 at 11:31:45AM +0200, Ingo Molnar wrote:
> > > Would be nice to see the actual kernel .config, as there's a few
> > > debug features that can slow things down significantly, such as
> > > CONFIG_KMEMCHECK=y or in some cases CONFIG_DEBUG_PAGEALLOC=y.
> > 
> > He sent it here: https://lkml.kernel.org/r/55229D7E.6080309@oracle.com
> > 
> > I'm attaching it again.
> 
> Thanks. Nothing particularly expensive stands out to me at a quick 
> glance:-/

Sasha uses KASAN very often and it is enabled here as well. I guess this
might slow things really down.
-- 
Michal Hocko
SUSE Labs
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