linux-kernel - Re: Quick merge window note..

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Date:	Sat, 8 Jan 2011 15:56:08 -0800
From:	Greg KH <gregkh@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>
Subject: Re: Quick merge window note..

On Fri, Jan 07, 2011 at 05:32:46PM -0800, Linus Torvalds wrote:
> But it's rather impressive and I really wanted to merge it, because
> some of the performance numbers are pretty stunning. For example, a
> hot-cache "find . -size" on my home directory (which basically just
> does name lookups to get the stat information for every file
> recursively) became 35% faster. And that's the _unthreaded_ case. Not
> some odd high-end scalability thing, and not some recompiled binary
> taking advantage of new facilities. Pathname lookup is just simply
> faster.
> 
> On the scary side, it's worth noticing that if you see any problems,
> and you think it might be due to the new rcu lookup, rather than
> bisect _everything_ (the merge window has already brought in 3700+
> commits), it may be worth just checking the VFS scale tip itself.
> That's fairly easy, because it's based on plain 2.6.37 (which if it
> isn't stable for you, we have bigger problems than the RCU lookup),
> and is just 57 commits up until commit b3e19d924b6e ("fs: scale
> mntget/mntput").

Thanks for the heads up.  In some initial testing here, it all looks
good to me.

greg k-h
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