linux-kernel - Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

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Message-ID: <20070802130319.GB15761@fieldses.org>
Date:	Thu, 2 Aug 2007 09:03:19 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Kasper Sandberg <lkml@...anurb.dk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ck@....kolivas.org
Subject: Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

On Wed, Aug 01, 2007 at 10:35:41PM -0400, Lee Revell wrote:
> On 7/31/07, Ingo Molnar <mingo@...e.hu> wrote:
> > Almost all of the Reiser3
> > code runs under the BKL, and the only other major kernel infrastructure
> > that has BKL dependencies is the TTY code.
> 
> Also NFS:
> 
> $ grep -rIi lock_kernel kernel-source/linux-2.6.17/fs/nfs/ | wc -l
> 94

All the file locking code (the nfs-related stuff in fs/lockd/, and also
the vfs code in fs/locks.c) is under the kernel lock.  I doubt it's held
very long unless you have ridiculous numbers of processes requesting
locks on the same file, but I don't know.

--b.
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