From: Benjamin LaHaise <bcrl@kvack.org>
To: Badari Pulavarty <pbadari@us.ibm.com>
Cc: Andrew Morton <akpm@osdl.org>, Nathan Scott <nathans@sgi.com>,
christoph <hch@lst.de>,
mcao@us.ibm.com, lkml <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH] change b_size to size_t
Date: Thu, 23 Feb 2006 11:32:04 -0500 [thread overview]
Message-ID: <20060223163204.GA27682@kvack.org> (raw)
In-Reply-To: <1140712093.22756.106.camel@dyn9047017100.beaverton.ibm.com>
On Thu, Feb 23, 2006 at 08:28:12AM -0800, Badari Pulavarty wrote:
> Here is the updated version of the patch, which changes
> buffer_head.b_size to size_t to support mapping large
> amount of disk blocks (for large IOs).
Your patch doesn't seem to be inline, so I can't quote it. Several
problems: on 64 bit platforms you introduced 4 bytes of padding into
buffer_head. atomic_t only takes up 4 byte, while size_t is 8 byte
aligned. This is a waste of memory, imo, seeing as the vast majority
of systems out there will not be doing 4GB+ ios any time soon.
Also, the cast to unsigned long long for size_t is pretty atrocious.
Cast to unsigned long if anything, as size_t is unsigned long on all
platforms linux runs on.
-ben
--
"Ladies and gentlemen, I'm sorry to interrupt, but the police are here
and they've asked us to stop the party." Don't Email: <dont@kvack.org>.
next prev parent reply other threads:[~2006-02-23 16:37 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-20 21:21 [PATCH 0/3] map multiple blocks in get_block() and mpage_readpages() Badari Pulavarty
2006-02-20 21:23 ` [PATCH 1/3] pass b_size to ->get_block() Badari Pulavarty
2006-02-20 21:23 ` [PATCH 2/3] map multiple blocks for mpage_readpages() Badari Pulavarty
2006-02-23 3:29 ` Suparna Bhattacharya
2006-02-23 22:18 ` Badari Pulavarty
2006-02-20 21:24 ` [PATCH 3/3] remove ->get_blocks() support Badari Pulavarty
2006-02-20 21:59 ` [PATCH 0/3] map multiple blocks in get_block() and mpage_readpages() Nathan Scott
2006-02-20 23:06 ` Badari Pulavarty
2006-02-20 23:16 ` Nathan Scott
2006-02-21 2:41 ` Jeremy Higdon
2006-02-21 16:03 ` Badari Pulavarty
2006-02-21 21:39 ` Nathan Scott
2006-02-22 15:12 ` christoph
2006-02-22 16:58 ` Badari Pulavarty
2006-02-22 16:59 ` christoph
2006-02-23 1:40 ` Nathan Scott
2006-02-23 1:59 ` Andrew Morton
2006-02-23 16:28 ` [PATCH] change b_size to size_t Badari Pulavarty
2006-02-23 16:32 ` Benjamin LaHaise [this message]
2006-02-23 17:20 ` Badari Pulavarty
2006-02-23 17:28 ` Badari Pulavarty
2006-02-23 17:29 ` Benjamin LaHaise
2006-02-23 18:46 ` Badari Pulavarty
2006-02-23 17:40 ` Badari Pulavarty
2006-02-23 16:40 ` Dave Kleikamp
2006-02-22 17:23 ` [PATCH 0/3] map multiple blocks in get_block() and mpage_readpages() Peter Staubach
2006-02-22 18:37 ` Dave Kleikamp
2006-02-22 19:00 ` Badari Pulavarty
2006-02-24 17:19 ` Badari Pulavarty
2006-03-06 10:03 ` Suparna Bhattacharya
2006-03-06 22:39 ` Nathan Scott
2006-03-07 9:00 ` Badari Pulavarty
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