From: Andrew Morton <akpm@linux-foundation.org>
To: Hugh Dickins <hughd@google.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/12] mm: let swap use exceptional entries
Date: Wed, 13 Jul 2011 16:11:21 -0700 [thread overview]
Message-ID: <20110713161121.17fd98a4.akpm@linux-foundation.org> (raw)
In-Reply-To: <alpine.LSU.2.00.1107121501100.2112@sister.anvils>
On Tue, 12 Jul 2011 15:08:58 -0700 (PDT)
Hugh Dickins <hughd@google.com> wrote:
> > All the crap^Wnice changes made to filemap.c really need some comments,
> > please. Particularly when they're keyed off the bland-sounding
> > "radix_tree_exception()". Apparently they have something to do with
> > swap, but how is the poor reader to know this?
>
> The naming was intentionally bland, because other filesystems might
> in future have other uses for such exceptional entries.
>
> (I think the field size would generally defeat it, but you can,
> for example, imagine a small filesystem wanting to save sector number
> there when a page is evicted.)
>
> But let's go bland when it's more familiar, and such uses materialize -
> particularly since I only placed those checks in places where they're
> needed now for shmem/tmpfs/swap.
>
> I'll keep the bland naming, if that's okay, but send a patch adding
> a line of comment in such places. Mentioning shmem, tmpfs, swap.
A better fix would be to create a nicely-documented filemap-specific
function with a non-bland name which simply wraps
radix_tree_exception().
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next prev parent reply other threads:[~2011-07-13 23:11 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-14 10:40 [PATCH 0/12] tmpfs: convert from old swap vector to radix tree Hugh Dickins
2011-06-14 10:42 ` [PATCH 1/12] radix_tree: exceptional entries and indices Hugh Dickins
2011-06-14 11:22 ` Pekka Enberg
2011-06-15 0:24 ` Hugh Dickins
2011-06-17 23:38 ` Andrew Morton
2011-06-18 0:07 ` Randy Dunlap
2011-06-18 0:12 ` Randy Dunlap
2011-06-18 1:52 ` Hugh Dickins
2011-07-19 22:36 ` Hugh Dickins
2011-07-19 23:28 ` Randy Dunlap
2011-06-18 0:13 ` Hugh Dickins
2011-06-18 21:48 ` Andrew Morton
2011-07-12 22:56 ` Hugh Dickins
2011-07-12 23:24 ` Andrew Morton
2011-07-13 22:27 ` Hugh Dickins
2011-06-14 10:43 ` [PATCH 2/12] mm: let swap use exceptional entries Hugh Dickins
2011-06-18 21:52 ` Andrew Morton
2011-07-12 22:08 ` Hugh Dickins
2011-07-13 23:11 ` Andrew Morton [this message]
2011-07-19 22:46 ` Hugh Dickins
2011-06-18 21:55 ` Andrew Morton
2011-07-12 22:35 ` Hugh Dickins
2011-06-14 10:45 ` [PATCH 3/12] tmpfs: demolish old swap vector support Hugh Dickins
2011-06-14 10:48 ` [PATCH 4/12] tmpfs: miscellaneous trivial cleanups Hugh Dickins
2011-06-14 10:49 ` [PATCH 5/12] tmpfs: copy truncate_inode_pages_range Hugh Dickins
2011-06-14 10:51 ` [PATCH 6/12] tmpfs: convert shmem_truncate_range to radix-swap Hugh Dickins
2011-06-14 10:52 ` [PATCH 7/12] tmpfs: convert shmem_unuse_inode " Hugh Dickins
2011-06-14 10:53 ` [PATCH 8/12] tmpfs: convert shmem_getpage_gfp " Hugh Dickins
2011-06-14 10:54 ` [PATCH 9/12] tmpfs: convert mem_cgroup shmem " Hugh Dickins
2011-06-14 10:56 ` [PATCH 10/12] tmpfs: convert shmem_writepage and enable swap Hugh Dickins
2011-06-14 10:57 ` [PATCH 11/12] tmpfs: use kmemdup for short symlinks Hugh Dickins
2011-06-14 11:16 ` Pekka Enberg
2011-06-14 10:59 ` [PATCH 12/12] mm: a few small updates for radix-swap Hugh Dickins
2011-06-15 0:49 ` [PATCH v2 " Hugh Dickins
2011-06-14 17:29 ` [PATCH 0/12] tmpfs: convert from old swap vector to radix tree Linus Torvalds
2011-06-14 18:20 ` Rik van Riel
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