linux-kernel - Re: [PATCH] mm: add replace_page_cache

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Date:	Fri, 17 Dec 2010 13:37:39 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Miklos Szeredi <miklos@...redi.hu>, akpm@...ux-foundation.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: add replace_page_cache_page() function

On Fri, Dec 17, 2010 at 11:10 AM, Hugh Dickins <hughd@...gle.com> wrote:
> On Fri, 17 Dec 2010, Minchan Kim wrote:
>> On Fri, Dec 17, 2010 at 10:21 AM, Hugh Dickins <hughd@...gle.com> wrote:
>> >
>> > I disagree with you there: I like the way Miklos made it symmetric,
>> > I like the way delete_from_swap_cache drops the swap cache reference,
>> > I dislike the way remove_from_page_cache does not - I did once try to
>> > change that, but did a bad job, messed up reiserfs or reiser4 I forget
>> > which, retreated in shame.
>>
>> I agree symmetric is good. I just said current fact which is that
>> remove_from_page_cache doesn't release ref.
>> So I thought we have to match current semantic to protect confusing.
>> Okay. I will not oppose current semantics.
>> Instead of it, please add it (ex, caller should hold the page
>> reference) in function description.
>>
>> I am happy to hear that you tried it.
>> Although it is hard, I think it's very valuable thing.
>> Could you give me hint to googling your effort and why it is failed?
>
> http://lkml.org/lkml/2004/10/24/140

Thanks.

Now we have only 3 callers of remove_from_page_cache in mmtom.

1. truncate_huge_page
2. shmem_writepage
3. truncate_complete_page
4. fuse_try_move_page

It seems all of caller hold the page reference so It's ok to change
the semantic of remove_from_page_cache.
Okay. I will do that.

>
> Hugh
>



-- 
Kind regards,
Minchan Kim
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