linux-kernel - Re: Preemptionirqsoff latency issue

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Message-ID: <1420856033.28767.1.camel@stgolabs.net>
Date:	Fri, 09 Jan 2015 18:13:53 -0800
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Vaibhav Shinde <v.bhav.shinde@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, tj@...nel.org,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Preemptionirqsoff latency issue

On Fri, 2015-01-09 at 20:19 +0530, Vaibhav Shinde wrote:
> My app runs on cpu0, while other cpus looks idle; as per my
> understanding from your comment owner of the mutex is on the cpu other
> than cpu0, and which is causing wait spin on cpu0.

The thing is, cpu0 is rescheduling too often, so you're falling out of
the spinning step.

Thanks,
Davidlohr

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