linux-kernel - Re: Announce: Semaphore-Removal tree

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Date:	Fri, 25 Apr 2008 14:22:31 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: Announce: Semaphore-Removal tree


On Fri, 2008-04-25 at 17:12 -0400, Christoph Hellwig wrote:
> On Fri, Apr 25, 2008 at 01:38:37PM -0700, Daniel Walker wrote:
> > I was reviewing your patches, and I don't like the semaphore to spinlock
> > changes.. There's no reason to start adding spinlocks, unless it's
> > really performance sensitive which none of those places are.. 
> 
> Yes, there is.  The spinlock is our most efficient locking primitive
> for the normal mostly un-contentded case.  Please get out of your
> realtime-ghetto.

If you can make a case for converting some semaphores to spinlocks be my
guest .. If you have good reasoning I wouldn't stand in the way.. (Real
time converts all the spinlocks to mutexes anyway ..)

Daniel

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