linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <CA+55aFzB3wfHgd6zwG0V0REvncqqubmFxV3Xzme4gL_Eecra_A@mail.gmail.com>
Date:	Thu, 20 Nov 2014 12:51:17 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Dave Jones <davej@...hat.com>,
	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: frequent lockups in 3.18rc4

On Thu, Nov 20, 2014 at 12:37 PM, Don Zickus <dzickus@...hat.com> wrote:
>
> Just for clarification, softlockups are processes hogging the cpu (thus
> blocking the high priority per-cpu watchdog thread).

Right. And there is no actual sign of any CPU hogging going on.
There's a single system call with a small payload (I think it's safe
to call 64kB small these days), no hugely contended CPU-spinning
locking, nada.

                    Linus
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