From: Vojtech Pavlik <vojtech@suse.cz>
To: Denis Vlasenko <vda@ilport.com.ua>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] deinline sleep/delay functions
Date: Fri, 1 Jul 2005 09:53:04 +0200 [thread overview]
Message-ID: <20050701075304.GA2041@ucw.cz> (raw)
In-Reply-To: <200506300852.25943.vda@ilport.com.ua>
On Thu, Jun 30, 2005 at 08:52:25AM +0300, Denis Vlasenko wrote:
> Hi Andrew,
>
> Optimizing delay functions for speed is utterly pointless.
>
> This patch turns ssleep(n), mdelay(n), udelay(n) and ndelay(n)
> into functions, thus they generate the smallest possible code
> at the callsite. Previously they were more or less inlined.
Optimizing mdelay() and udelay() for speed is pointless, but optimizing
ndelay() makes a lot of sense - if the setup time (call, etc) of the
delay is large, the delay time will be off by many percent.
--
Vojtech Pavlik
SuSE Labs, SuSE CR
prev parent reply other threads:[~2005-07-01 7:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-30 5:52 [PATCH] deinline sleep/delay functions Denis Vlasenko
2005-06-30 8:52 ` Russell King
2005-06-30 9:11 ` Andrew Morton
2005-06-30 9:19 ` Arjan van de Ven
2005-06-30 10:21 ` Denis Vlasenko
2005-06-30 10:47 ` Arjan van de Ven
2005-06-30 11:10 ` Denis Vlasenko
2005-06-30 11:21 ` Russell King
2005-06-30 11:22 ` Arjan van de Ven
2005-06-30 11:44 ` Denis Vlasenko
2005-06-30 11:57 ` Maciej W. Rozycki
2005-06-30 12:04 ` Russell King
2005-06-30 12:20 ` Denis Vlasenko
2005-07-01 7:54 ` Vojtech Pavlik
2005-06-30 9:44 ` Russell King
2005-07-01 7:53 ` Vojtech Pavlik [this message]
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