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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20050701075304.GA2041@ucw.cz \
--to=vojtech@suse.cz \
--cc=akpm@osdl.org \
--cc=linux-kernel@vger.kernel.org \
--cc=vda@ilport.com.ua \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.