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From: Davidlohr Bueso <dave@stgolabs.net>
To: Vaibhav Shinde <v.bhav.shinde@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	tj@kernel.org, Steven Rostedt <rostedt@goodmis.org>
Subject: Re: Preemptionirqsoff latency issue
Date: Fri, 09 Jan 2015 18:13:53 -0800	[thread overview]
Message-ID: <1420856033.28767.1.camel@stgolabs.net> (raw)
In-Reply-To: <CAB5gotu75cXeHKhn-GShOTKW7=2bVdYfeUpxM7kCSTRWRsC79Q@mail.gmail.com>

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


      parent reply	other threads:[~2015-01-10  2:14 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAB5gottA3D_eJsHcGwO62fJtEqMqivX2kS5D-JhHphW9ADV88A@mail.gmail.com>
2015-01-09  9:56 ` Peter Zijlstra
     [not found]   ` <CAB5gotu75cXeHKhn-GShOTKW7=2bVdYfeUpxM7kCSTRWRsC79Q@mail.gmail.com>
2015-01-09 16:25     ` Steven Rostedt
2015-01-10  2:13     ` Davidlohr Bueso [this message]

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