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Message-ID: <77052.1465269772@turing-police.cc.vt.edu>
Date:	Mon, 06 Jun 2016 23:22:52 -0400
From:	Valdis.Kletnieks@...edu
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Waiman Long <waiman.long@....com>,
	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>,
	Al Viro <viro@...iv.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: performance delta after VFS i_mutex=>i_rwsem conversion

On Mon, 06 Jun 2016 14:20:32 -0700, Linus Torvalds said:

> I guess some "concurrent readdir with unlink" load would show that
> behavior, but is it _realistic_? No idea. Let's not worry about it too
> much until somebody shows a reason to worry.

I've seen Makefiles where 'make clean' does a 'find . -name "*.o" | xargs rm'.

But if somebody is doing that often enough against cache-cold directory trees
to matter, they have bigger problems (like learning how to properly develop
code using 'make').  So unless performance is *so* bad it triggers the lockup
detector, it's probably OK....


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