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

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Message-ID: <20150407110531.GA14136@gmail.com>
Date:	Tue, 7 Apr 2015 13:05:31 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	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>, Michal Hocko <mhocko@...e.cz>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: Re: Hang on large copy_from_user with PREEMPT_NONE


* 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:-/

Thanks,

	Ingo
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