linux-kernel - Re: RFC on fixing mutex spinning on owner

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Message-ID: <20160316233530.GA8731@kroah.com>
Date:	Wed, 16 Mar 2016 16:35:30 -0700
From:	Greg Kroah-Hartman <greg@...ah.com>
To:	Joel Fernandes <agnel.joel@...il.com>
Cc:	linux-rt-users@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kernelnewbies <kernelnewbies@...linux.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: RFC on fixing mutex spinning on owner

On Wed, Mar 16, 2016 at 04:22:17PM -0700, Joel Fernandes wrote:
> Hi,
> 
> On a fairly recent kernel and android userspace, I am seeing that with
> i915 driver is in a spin loop waiting for mutex owner to release it
> (mutex_spin_on_owner).

Why not provide a backtrace to the drm and i915 developers so that they
can work on this?  The mailing lists you sent this to can't do much
about this, sorry...

thanks,

greg k-h