From: Christoph Hellwig <hch@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nick Piggin <npiggin@kernel.dk>,
Al Viro <viro@zeniv.linux.org.uk>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [patch 1/6] fs: icache RCU free inodes
Date: Tue, 9 Nov 2010 11:21:31 -0500 [thread overview]
Message-ID: <20101109162131.GA3781@infradead.org> (raw)
In-Reply-To: <AANLkTi=b3dEmoTgrJ2xMTUzgM-mUQNNx6J9jeLq2=mtf@mail.gmail.com>
On Tue, Nov 09, 2010 at 08:02:38AM -0800, Linus Torvalds wrote:
> Remind me why it wasn't sufficient to just use SLAB_DESTROY_BY_RCU?
Dave sent a patch for it, which looks much better to me. Nick thinks
it doesn't work for his store free path walk, but I haven't seen an
explanation why exactly.
> The only thing we care about is the pathname walk - there are no other
> inode operations that are common enough to worry about. And the only
> thing _that_ needs is the ability to look at the inode under RCU, and
> SLAB_DESTROY_BY_RCU should be entirely sufficient for that.
It might be worth it for inode lookup. While it's shadowed by the
dcache hash we still hit it a lot, especially for NFS serving.
next prev parent reply other threads:[~2010-11-09 16:21 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-09 12:46 [patch 1/6] fs: icache RCU free inodes Nick Piggin
2010-11-09 12:47 ` [patch 2/6] fs: icache avoid RCU freeing for pseudo fs Nick Piggin
2010-11-09 12:58 ` [patch 3/6] fs: dcache documentation cleanup Nick Piggin
2010-11-09 16:24 ` Christoph Hellwig
2010-11-09 22:06 ` Nick Piggin
2010-11-10 16:27 ` Christoph Hellwig
2010-11-09 13:01 ` [patch 4/6] fs: d_delete change Nick Piggin
2010-11-09 16:25 ` Christoph Hellwig
2010-11-09 22:08 ` Nick Piggin
2010-11-10 16:32 ` Christoph Hellwig
2010-11-11 0:27 ` Nick Piggin
2010-11-11 22:07 ` Linus Torvalds
2010-11-09 13:02 ` [patch 5/6] fs: d_compare change for rcu-walk Nick Piggin
2010-11-09 16:25 ` Christoph Hellwig
2010-11-10 1:48 ` Nick Piggin
2010-11-09 13:03 ` [patch 6/6] fs: d_hash " Nick Piggin
2010-11-09 14:19 ` [patch 1/6] fs: icache RCU free inodes Andi Kleen
2010-11-09 21:36 ` Nick Piggin
2010-11-10 14:47 ` Andi Kleen
2010-11-11 4:27 ` Nick Piggin
2010-11-09 16:02 ` Linus Torvalds
2010-11-09 16:21 ` Christoph Hellwig [this message]
2010-11-09 21:48 ` Nick Piggin
2010-11-09 16:21 ` Eric Dumazet
2010-11-09 17:08 ` Linus Torvalds
2010-11-09 17:15 ` Christoph Hellwig
2010-11-09 21:55 ` Nick Piggin
2010-11-09 22:05 ` Nick Piggin
2010-11-12 1:24 ` Nick Piggin
2010-11-12 4:48 ` Linus Torvalds
2010-11-12 6:02 ` Nick Piggin
2010-11-12 6:49 ` Nick Piggin
2010-11-12 17:33 ` Linus Torvalds
2010-11-12 23:17 ` Nick Piggin
2010-11-15 1:00 ` Dave Chinner
2010-11-15 4:21 ` Nick Piggin
2010-11-16 3:02 ` Dave Chinner
2010-11-16 3:49 ` Nick Piggin
2010-11-17 1:12 ` Dave Chinner
2010-11-17 4:18 ` Nick Piggin
2010-11-17 5:56 ` Nick Piggin
2010-11-17 6:04 ` Nick Piggin
2010-11-09 21:44 ` Nick Piggin
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