From: Andi Kleen <ak@suse.de>
To: Peter Chubb <peterc@gelato.unsw.edu.au>
Cc: Arnd Bergmann <arnd@arndb.de>, Martin Peschke <mp3@de.ibm.com>,
Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org, hch@infradead.org,
arjan@infradead.org, James.Smart@emulex.com,
James.Bottomley@steeleye.com
Subject: Re: [RFC] [Patch 7/8] statistics infrastructure - exploitation prerequisite
Date: Wed, 17 May 2006 03:27:51 +0200 [thread overview]
Message-ID: <200605170327.52605.ak@suse.de> (raw)
In-Reply-To: <17514.31511.386806.484792@wombat.chubb.wattle.id.au>
> Anrd> - do_gettimeofday
> Anrd> potentially slow, reliable TOD clock, microsecond resolution
>
> Slow, not necessarily safe to call in IRQ context.
It's only slow if the platform can't do better. On good hardware it is
fast. And yes it is safe to call in IRQ context. Networking does
that all the time.
If the hardware doesn't have a good working timer for gettimeofday
then everything else will be also slow.
-Andi
next prev parent reply other threads:[~2006-05-17 1:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-16 17:47 [RFC] [Patch 7/8] statistics infrastructure - exploitation prerequisite Martin Peschke
2006-05-16 18:28 ` Andrew Morton
2006-05-16 22:36 ` Martin Peschke
2006-05-16 23:03 ` Arnd Bergmann
2006-05-17 1:23 ` Peter Chubb
2006-05-17 1:27 ` Andi Kleen [this message]
2006-05-17 1:43 ` Peter Chubb
2006-05-17 2:24 ` Christoph Lameter
2006-05-17 1:13 ` Peter Chubb
2006-05-17 2:32 ` Nick Piggin
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