From: Theodore Ts'o <tytso@mit.edu>
To: Lukas Czerner <lczerner@redhat.com>
Cc: linux-ext4@vger.kernel.org
Subject: Re: [PATCH 2/2] ext4: introduce ext4_get_group_number()
Date: Tue, 26 Mar 2013 23:44:22 -0400 [thread overview]
Message-ID: <20130327034422.GF5861@thunk.org> (raw)
In-Reply-To: <20130327031207.GC5861@thunk.org>
On Tue, Mar 26, 2013 at 11:12:07PM -0400, Theodore Ts'o wrote:
> Again, we have the same problem as the previous patch. I could
> imagine setting a flag which uses the shift-instead-of-div
> optimization, but that will reduce the optimization somewhat.
Just to be clear, I was thinking that at mount time we could check to
see whether the number of blocks per group == blocksize * 8, and if
so, then set a per-filesystem flag in the sbi structure which we could
then use to optionally use the shift-right optimization.
- Ted
next prev parent reply other threads:[~2013-03-27 3:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-25 10:24 [PATCH 1/2] ext4: Make ext4_block_in_group() much more efficient Lukas Czerner
2013-03-25 10:24 ` [PATCH 2/2] ext4: introduce ext4_get_group_number() Lukas Czerner
2013-03-27 3:12 ` Theodore Ts'o
2013-03-27 3:44 ` Theodore Ts'o [this message]
2013-03-27 3:05 ` [PATCH 1/2] ext4: Make ext4_block_in_group() much more efficient Theodore Ts'o
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