linux-kernel - Re: stat benchmark

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Date:	Mon, 28 Apr 2008 10:46:37 -0700
From:	Zach Brown <zach.brown@...cle.com>
To:	Carl Henrik Lunde <chlunde@...g.uio.no>
CC:	Soeren Sandmann <sandmann@...mi.au.dk>,
	linux-kernel@...r.kernel.org
Subject: Re: stat benchmark


> I guess it would be difficult to get close to the optimal disk schedule by
> using syslets; if a directory contains 1000 files that would require 1000
> syslets and a good I/O scheduler - that's unlikely to be feasible.

It wouldn't even get to the I/O scheduler.   The VFS stat path (see
real_lookup()) is synchronous and serialized.  Each stat will hold the
i_mutex of the parent directory while it waits for the file system's
lookup method to populate the inode from disk.

- z
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