linux-kernel - Re: [PATCH] proc: change proc_subdir

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Message-ID: <DDAFF52F-3277-4645-9DA9-62C388DA445C@xmission.com>
Date:	Wed, 29 Jul 2015 17:21:10 -0500
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Waiman Long <Waiman.Long@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>
CC:	linux-kernel@...r.kernel.org, Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>
Subject: Re: [PATCH] proc: change proc_subdir_lock to a rwlock

Two quick questions.

- What motivates this work?  Are you seeing lots of
  parallel reads on proc?

- Why not rcu?  Additions and removal of proc generic
  files is very rare.  Conversion to rcu for reads should
  perform better and not take much more work.

Eric

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