linux-kernel - Re: [PATCH] mm: unify shmem and tiny-shmem

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Date:	Thu, 02 Oct 2008 17:44:02 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Hugh Dickins <hugh@...itas.com>, Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: unify shmem and tiny-shmem


On Thu, 2008-10-02 at 23:23 +0100, David Howells wrote:
> Hugh Dickins <hugh@...itas.com> wrote:
> 
> > That's much nicer than I'd been imagining, thanks Matt: I've no qualms
> > about the few #ifdefs you're adding to mm/shmem.c, it does seem an
> > outright improvement that you're bringing them together.
> 
> It's not an outright improvement.  shmem.o is still larger than tiny-shmem.o,
> albeit not a lot; however, some embedded people really do count the bytes.

Here the difference comes down to 16 bytes for the "if (size < 0)"
check/branch, which is a worthwhile check.

> > This ifndef is the ugliest part of it: and looking into it, guess
> > what, shmem_get_unmapped_area() hasn't been used since 2.6.20 -
> > that's right, isn't it, David?
> 
> Ummm...  It seems to be.  I think it used to be used by SYSV SHM.  Certainly
> deleting that function causes no link problems.

I've got a patch queued to drop it, will post shortly.

-- 
Mathematics is the supreme nostalgia of our time.

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