linux-kernel - Re: [patch 1/6] fs: icache RCU free inodes

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Message-ID: <AANLkTi=b3dEmoTgrJ2xMTUzgM-mUQNNx6J9jeLq2=mtf@mail.gmail.com>
Date:	Tue, 9 Nov 2010 08:02:38 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [patch 1/6] fs: icache RCU free inodes

On Tue, Nov 9, 2010 at 4:46 AM, Nick Piggin <npiggin@...nel.dk> wrote:
> So here is the inode RCU code. It's obviously not worth doing until the
> actual rcu-walk path walking is in, but I'd like to get opinions on it.
> It would be nice to merge it in Al's tree at some point, though.

Remind me why it wasn't sufficient to just use SLAB_DESTROY_BY_RCU?

Especially if we still lock things for the actual (few) inode list
operations, the added complexity of actually freeing _individual_
inodes by RCU seems to be a bad thing.

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.

But we had some discussion about this long ago, and I may have
forgotten some of the context.

                             Linus
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