linux-kernel - Re: performance delta after VFS i_mutex=>i

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Message-ID: <20160607005837.GJ14480@ZenIV.linux.org.uk>
Date:	Tue, 7 Jun 2016 01:58:37 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Hansen <dave.hansen@...el.com>,
	"Chen, Tim C" <tim.c.chen@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Davidlohr Bueso <dbueso@...e.de>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Jason Low <jason.low2@...com>,
	Michel Lespinasse <walken@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Waiman Long <waiman.long@...com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: performance delta after VFS i_mutex=>i_rwsem conversion

On Tue, Jun 07, 2016 at 01:40:58AM +0100, Al Viro wrote:

> as initial attempt at lockless next_positive(); barriers are probably wrong,
> though...

More than just barriers...  _Absolutely_ untested variant pushed into
vfs.git#untested.dcache_readdir (the last 3 commits in there).  It
compiles, but that's it.