linux-kernel - Re: [patch 6/9] mm + fs: store shadow entries in page cache

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Message-ID: <20131126102053.GJ10022@twins.programming.kicks-ass.net>
Date:	Tue, 26 Nov 2013 11:20:53 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Jan Kara <jack@...e.cz>,
	Vlastimil Babka <vbabka@...e.cz>, Tejun Heo <tj@...nel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Greg Thelen <gthelen@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Michel Lespinasse <walken@...gle.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	Ozgun Erdogan <ozgun@...usdata.com>,
	Metin Doslu <metin@...usdata.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 6/9] mm + fs: store shadow entries in page cache

On Tue, Nov 26, 2013 at 10:17:16AM +1100, Dave Chinner wrote:
> void truncate_inode_pages_final(struct address_space *mapping)
> {
> 	mapping_set_exiting(mapping);
> 	if (inode->i_data.nrpages || inode->i_data.nrshadows) {
> 		/*
> 		 * spinlock barrier to ensure all modifications are
> 		 * complete before we do the final truncate
> 		 */
> 		spin_lock_irq(&mapping->tree_lock);
> 		spin_unlock_irq(&mapping->tree_lock);

	spin_unlock_wait() ?

Its cheaper, but prone to starvation; its typically useful when you're
waiting for the last owner to go away and know there won't be any new
ones around.

> 		truncate_inode_pages_range(mapping, 0, (loff_t)-1);
> }
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