linux-kernel - Re: [PATCH 02/24] iov_iter: Renumber the ITER

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Message-ID: <20181020045933.GI32577@ZenIV.linux.org.uk>
Date:   Sat, 20 Oct 2018 05:59:33 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     David Howells <dhowells@...hat.com>
Cc:     linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/24] iov_iter: Renumber the ITER_* constants in uio.h

On Sat, Oct 20, 2018 at 02:10:52AM +0100, David Howells wrote:
> Renumber the ITER_* constants in uio.h to be contiguous to make comparing
> them more efficient in a switch-statement.

Are you sure that they *are* more efficient that way?  Some of those paths
are fairly hot, so much that I would really like to see profiles before
and after these changes (both this and the previous one).