linux-kernel - Re: [dm-devel] [PATCH 2/3] Introduce percpu rw semaphores

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Message-ID: <20120801171527.GB2491@linux.vnet.ibm.com>
Date:	Wed, 1 Aug 2012 10:15:27 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Jens Axboe <axboe@...nel.dk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Jan Kara <jack@...e.cz>, dm-devel@...hat.com,
	linux-kernel@...r.kernel.org, Jeff Moyer <jmoyer@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	kosaki.motohiro@...fujitsu.com, linux-fsdevel@...r.kernel.org,
	lwoodman@...hat.com, "Alasdair G. Kergon" <agk@...hat.com>
Subject: Re: [dm-devel] [PATCH 2/3] Introduce percpu rw semaphores

On Mon, Jul 30, 2012 at 08:00:19PM -0400, Mikulas Patocka wrote:
> 
> 
> On Mon, 30 Jul 2012, Paul E. McKenney wrote:
> 
> > On Sun, Jul 29, 2012 at 01:13:34AM -0400, Mikulas Patocka wrote:
> > > On Sat, 28 Jul 2012, Eric Dumazet wrote:
> > > > On Sat, 2012-07-28 at 12:41 -0400, Mikulas Patocka wrote:
> > 
> > [ . . . ]
> > 
> > > > (bdev->bd_block_size should be read exactly once )
> > > 
> > > Rewrite all direct and non-direct io code so that it reads block size just 
> > > once ...
> > 
> > For whatever it is worth, the 3.5 Linux kernel only has about ten mentions
> > of bd_block_size, at least according to cscope.
> 
> plus 213 uses of i_blkbits (which is derived directly from bd_block_size). 
> 45 of them is in fs/*.c and mm/*.c

At least it is only hundreds rather than thousands!  ;-)

							Thanx, Paul

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