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

[Nick Piggin <npiggin@suse.de>]

On Tue, Dec 18, 2007 at 07:50:33PM +0800, Fengguang Wu wrote:
> 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.

Exactly.
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