linux-kernel - Re: [PATCH v2 2/3] mutex: add support for reservation style locks, v2

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Date:	Thu, 04 Apr 2013 18:54:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	Maarten Lankhorst <maarten.lankhorst@...onical.com>,
	linux-arch@...r.kernel.org, daniel.vetter@...ll.ch, x86@...nel.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	linaro-mm-sig@...ts.linaro.org, robclark@...il.com,
	tglx@...utronix.de, mingo@...e.hu, linux-media@...r.kernel.org
Subject: Re: [PATCH v2 2/3] mutex: add support for reservation style locks,
 v2

On Thu, 2013-04-04 at 15:31 +0200, Daniel Vetter wrote:
> Well, it was a good read and I'm rather happy that we agree on the
> ww_ctx
> thing (whatever it's called in the end), even though we have slightly
> different reasons for it.

Yeah, I tried various weirdness to get out from under it, but the whole
progress/fairness thing made it rather hard. Ideally you'd be able to
use some existing scheduler state since its the same goal, but the
whole wakeup-retry muck makes that hard.

> I don't really have a useful idea to make the retry handling for users
> more rusty-compliant though, and I'm still unhappy with all current
> naming
> proposals ;-)

Ah, naming,.. yeah I'm not too terribly attached to most of them. I
just want to avoid something that's reasonably well known to mean
something different.

Furthermore, since we use the wound/wait symmetry breaking it would
make sense for that to appear somewhere in the name.

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