linux-kernel - Re: [PATCH 2/9] readahead: clean up and simplify the code for filemap page fault readahead

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Message-Id: <E1J4ay1-0000ak-3e@localhost>
Date:	Tue, 18 Dec 2007 19:50:33 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] readahead: clean up and simplify the code for
	filemap page fault readahead

On Tue, Dec 18, 2007 at 09:19:07AM +0100, Nick Piggin wrote:
> On Sun, Dec 16, 2007 at 07:59:30PM +0800, Fengguang Wu wrote:

> > +	read_lock_irq(&mapping->tree_lock);
> > +	page = radix_tree_lookup(&mapping->page_tree, offset);
> > +	if (likely(page)) {
> > +		int got_lock, uptodate;
> > +		page_cache_get(page);
> > +
> > +		got_lock = !TestSetPageLocked(page);
> > +		uptodate = PageUptodate(page);
> > +		read_unlock_irq(&mapping->tree_lock);
> 
> If we could avoid open coding tree_lock here (and expanding its coverage
> to PageUptodate), that would be nice. I don't think it gains us too much.

To use find_get_page()? That would be nice to me, too.

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