linux-kernel - Re: [GIT PATCH] TTY patches for 2.6.33-git

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Message-Id: <200912141139.48115.oliver@neukum.org>
Date:	Mon, 14 Dec 2009 11:39:48 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT PATCH] TTY patches for 2.6.33-git

Am Montag, 14. Dezember 2009 06:30:15 schrieb Arjan van de Ven:
> > We have the bkl tracepoints for that, attaching an example below,
> > blkdev_get/bkldev_put is among the highest consumer for me.
> 
> we have a trace, but not a number that anyone can just pull out without
> having to go through great lengths to set stuff up... (esp to capture a
> boot)...
> Adding a counter always to the lock_kernel function should be fine
> instead...

But don't we need to know how long it is held? If you just count
you'll make code that drops it while it can look bad.

	Regards
		Oliver
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