linux-kernel - Re: [PATCH 2/2] __down_common: use signal_pending

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Date:	Wed, 4 Jun 2008 22:08:58 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] __down_common: use signal_pending_state()

On 06/04, Matthew Wilcox wrote:
>
> On Wed, Jun 04, 2008 at 09:09:06PM +0400, Oleg Nesterov wrote:
> > Cleanup. __down_common() can use the new signal_pending_state() helper.
>
> This is a bad optimisation.  __down_common gets inlined and the constant
> 'state' versions are optimised away for the versions which don't apply.
>
> NAK this patch.

OK.

But this was not optimisation, just code re-use.

Actually, I don't understand why __down_common/__mutex_lock_common are inlines,
perhaps it is better to shrink .text instead.

For example, "size kernel/mutex.o" reports

	2715       0      12    2727     aa7 kernel/mutex.o

with __mutex_lock_common() uninlined, we have

	1565       0      12    1577     629 kernel/mutex.o

the difference is more than K.

Oleg.

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