linux-kernel - Re: [PATCH 1/4] mm: exporting account_page

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Date:	Fri, 20 Aug 2010 08:37:03 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Wu Fengguang <fengguang.wu@...el.com>
cc:	Michael Rubin <mrubin@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"jack@...e.cz" <jack@...e.cz>, "riel@...hat.com" <riel@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"david@...morbit.com" <david@...morbit.com>,
	"npiggin@...nel.dk" <npiggin@...nel.dk>, "hch@....de" <hch@....de>,
	"axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [PATCH 1/4] mm: exporting account_page_dirty

On Fri, 20 Aug 2010, Wu Fengguang wrote:
> Sage,
> 
> This is actually a bug fix for ceph, which missed the task_dirty_inc()
> call in account_page_dirty().
> 
> Reviewed-by: Wu Fengguang <fengguang.wu@...el.com>

Thanks, I missed this one earlier.  I'll queue it up.

sage



> 
> On Fri, Aug 20, 2010 at 05:31:26PM +0800, Michael Rubin wrote:
> > This allows code outside of the mm core to safely manipulate page state
> > and not worry about the other accounting. Not using these routines means
> > that some code will lose track of the accounting and we get bugs. This
> > has happened once already.
> > 
> > Signed-off-by: Michael Rubin <mrubin@...gle.com>
> > ---
> >  fs/ceph/addr.c      |    8 +-------
> >  mm/page-writeback.c |    1 +
> >  2 files changed, 2 insertions(+), 7 deletions(-)
> > 
> > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> > index 5598a0d..420d469 100644
> > --- a/fs/ceph/addr.c
> > +++ b/fs/ceph/addr.c
> > @@ -105,13 +105,7 @@ static int ceph_set_page_dirty(struct page *page)
> >  	spin_lock_irq(&mapping->tree_lock);
> >  	if (page->mapping) {	/* Race with truncate? */
> >  		WARN_ON_ONCE(!PageUptodate(page));
> > -
> > -		if (mapping_cap_account_dirty(mapping)) {
> > -			__inc_zone_page_state(page, NR_FILE_DIRTY);
> > -			__inc_bdi_stat(mapping->backing_dev_info,
> > -					BDI_RECLAIMABLE);
> > -			task_io_account_write(PAGE_CACHE_SIZE);
> > -		}
> > +		account_page_dirtied(page, page->mapping);
> >  		radix_tree_tag_set(&mapping->page_tree,
> >  				page_index(page), PAGECACHE_TAG_DIRTY);
> >  
> > diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> > index 7262aac..9d07a8d 100644
> > --- a/mm/page-writeback.c
> > +++ b/mm/page-writeback.c
> > @@ -1131,6 +1131,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
> >  		task_io_account_write(PAGE_CACHE_SIZE);
> >  	}
> >  }
> > +EXPORT_SYMBOL(account_page_dirtied);
> >  
> >  /*
> >   * For address_spaces which do not use buffers.  Just tag the page as dirty in
> > -- 
> > 1.7.1
> 
> 
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