linux-kernel - Re: [PATCH] mm: set_page_dirty_balance() vs ->page

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Message-Id: <200710081747.52627.nickpiggin@yahoo.com.au>
Date:	Mon, 8 Oct 2007 17:47:52 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Chinner <dgc@....com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	David Howells <dhowells@...hat.com>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	mark.fasheh@...cle.com, hugh <hugh@...itas.com>,
	stable <stable@...nel.org>
Subject: Re: [PATCH] mm: set_page_dirty_balance() vs ->page_mkwrite()

On Tuesday 09 October 2007 09:36, David Chinner wrote:
> On Mon, Oct 08, 2007 at 04:37:00PM +1000, Nick Piggin wrote:
> > On Tuesday 09 October 2007 02:54, Peter Zijlstra wrote:

> > > Force a balance call if ->page_mkwrite() was successful.
> >
> > Would it be better to just have the callers set_page_dirty_balance()?
>
> block_page_mkwrite() is just using generic interfaces to do this,
> same as pretty much any write() system call. The idea was to make it
> as similar to the write() call path as possible...
>
> However, unlike generic_file_buffered_write(), we are not calling
> balance_dirty_pages_ratelimited(mapping) between
> ->prepare/commit_write call pairs.  Perhaps this should be added to
> block_page_mkwrite() after the page is unlocked....

That sounds pretty sane, in terms of matching with
generic_file_buffered_write.
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