Re: [PATCH 01/02/RFC] implement a stat cache

From: Luciano Rocha <luciano@eurotux.com>
Date: Apr 20, 2008, 11:18 UTC
Message-ID: <20080420111847.GC13411@bit.office.eurotux.com>
In-Reply-To: <20080420111346.GA13411@bit.office.eurotux.com>

On Sun, Apr 20, 2008 at 12:13:46PM +0100, Luciano Rocha wrote:

Show 14 quoted lines

> An implementation of stat(2) and lstat(2) caching. Both the return code
> and returned information are cached.
> 
> Signed-off-by: Luciano Rocha <strange@nsk.no-ip.org>
> ---
> On Sat, Apr 19, 2008 at 03:39:37PM -0700, Linus Torvalds wrote:
> > Yeah. I didn't look any further, but we do a total of *nine* 'lstat()' 
> > calls for each file we know about that is dirty, and *seven* when they are 
> > clean. Plus maybe a few more.
> 
> That's a lot. Why not use a stat cache?
> 
> With these changes, my git status . in WebKit changes from 28.215s to
> 15.414s.

git status . in git changes from 0.477s to 0.412s.

All tests under OS X.

-- 
Luciano Rocha <luciano@eurotux.com>
Eurotux Informática, S.A. <http://www.eurotux.com/>