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From: Hollis Blanchard <hollisb@us.ibm.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: David McCullough <davidm@snapgear.com>,
	uclinux-dev@uclinux.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"Ihar \"Philips\" Filipau" <filia@softhome.net>
Subject: Re: [uClinux-dev] Kernel 2.6 size increase - get_current()?
Date: Thu, 24 Jul 2003 14:51:16 -0500	[thread overview]
Message-ID: <3038B2BC-BE10-11D7-B453-000A95A0560C@us.ibm.com> (raw)
In-Reply-To: <1059075436.7998.58.camel@dhcp22.swansea.linux.org.uk>

On Thursday, Jul 24, 2003, at 14:37 US/Central, Alan Cox wrote:

> On Iau, 2003-07-24 at 16:30, Hollis Blanchard wrote:
>> So you're arguing for more inlining, because icache speculative
>> prefetch will pick up the inlined code?
>
> I'm arguing for short inlined fast paths and non inlined unusual
> paths.
>
>> Or you're arguing for less, because code like get_current() which is
>> called frequently could have a single copy living in icache?
>
> Depends how much the jump costs you.

And also how big your icache is, and maybe even cpu/bus ratio, etc... 
which depend on the arch of course.

So as I saw Ihar suggest earlier in this thread, perhaps there should 
be two inline directives: must_inline (for code whose correctness 
depends on it) and could_help_performance_inline. Then different archs 
could #define could_help_performance_inline as appropriate.

-- 
Hollis Blanchard
IBM Linux Technology Center


  reply	other threads:[~2003-07-24 19:36 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-23 18:46 Kernel 2.6 size increase Bernardo Innocenti
2003-07-23 19:14 ` Richard B. Johnson
2003-07-23 20:07   ` David S. Miller
2003-07-23 21:47     ` Randy.Dunlap
2003-07-23 19:32 ` [uClinux-dev] " Christoph Hellwig
2003-07-23 20:11   ` David S. Miller
2003-07-23 20:15     ` Christoph Hellwig
2003-07-23 20:22       ` David S. Miller
2003-07-23 20:27         ` Christoph Hellwig
2003-07-23 22:35           ` [uClinux-dev] Kernel 2.6 size increase - get_current()? Bernardo Innocenti
2003-07-23 22:37             ` Alan Cox
2003-07-23 23:00               ` Bernardo Innocenti
2003-07-24  5:06                 ` David McCullough
2003-07-24 11:28                   ` Alan Cox
2003-07-24 12:04                     ` David McCullough
2003-07-24 14:48                       ` Alan Cox
2003-07-25 18:25                       ` bill davidsen
2003-07-24 15:30                     ` Hollis Blanchard
2003-07-24 19:37                       ` Alan Cox
2003-07-24 19:51                         ` Hollis Blanchard [this message]
2003-07-24 21:20                           ` J.A. Magallon
2003-07-25  4:22                             ` Otto Solares
2003-07-25 14:38                               ` Hollis Blanchard
2003-07-28  3:19                                 ` Miles Bader
2003-07-28  8:14                                   ` Ihar "Philips" Filipau
2003-07-28  8:58                                     ` Miles Bader
2003-07-28  9:03                                       ` Ihar "Philips" Filipau
2003-07-23 21:57   ` [uClinux-dev] Kernel 2.6 size increase Bernardo Innocenti
2003-07-23 22:07     ` Bernardo Innocenti
2003-07-23 22:27       ` Willy Tarreau
2003-07-23 22:34         ` Alan Cox
2003-07-24 20:27         ` Bernardo Innocenti
2003-07-25 15:46           ` Christoph Hellwig
2003-07-25 23:55             ` [PATCH] Make I/O schedulers optional (Was: Re: Kernel 2.6 size increase) Bernardo Innocenti
2003-07-26  8:17               ` Andrew Morton
2003-07-26 12:40                 ` Bernardo Innocenti
2003-07-26 14:07                   ` Jens Axboe
2003-07-26 23:42                     ` Bernardo Innocenti
2003-07-26 23:41                       ` Jens Axboe
2003-07-28 17:13             ` [uClinux-dev] Kernel 2.6 size increase Nicolas Pitre
2003-07-28 23:02               ` Bernardo Innocenti
2003-07-29  2:36                 ` Miles Bader
2003-08-08 13:25                 ` [uClinux-dev] " David Woodhouse
2003-08-08 14:37                   ` Bernardo Innocenti
2003-08-08 14:43                     ` David Woodhouse
2003-07-25 18:16           ` bill davidsen
2003-07-29 22:29           ` Tom Rini
2003-07-29 22:48             ` Alan Cox
2003-07-29 23:06               ` Tom Rini
2003-07-30  2:07                 ` Miles Bader
2003-07-30 15:33                   ` Tom Rini
2003-07-31  1:49                     ` Miles Bader
2003-07-31  4:17                       ` Tom Rini
2003-07-31  5:03                         ` Miles Bader
2003-07-31 15:24                           ` Tom Rini
2003-07-30  2:49             ` [uClinux-dev] " Bernardo Innocenti
2003-07-30 15:35               ` Tom Rini
2003-07-30 16:45                 ` [uClinux-dev] Kernel 2.6 size increase (PATCH) Bernardo Innocenti
     [not found] <cwQJ.3BO.29@gated-at.bofh.it>
     [not found] ` <cypH.5dM.35@gated-at.bofh.it>
     [not found]   ` <cyza.5lN.13@gated-at.bofh.it>
     [not found]     ` <cArg.74D.11@gated-at.bofh.it>
2003-07-24  8:13       ` [uClinux-dev] Kernel 2.6 size increase - get_current()? Ihar "Philips" Filipau
2003-07-25  7:25         ` Denis Vlasenko
2003-07-25 18:36         ` bill davidsen
2003-07-24  8:27 Ihar "Philips" Filipau
2003-07-24 11:50 ` David McCullough
     [not found] <d2nx.4QV.15@gated-at.bofh.it>
     [not found] ` <dbTZ.5Z5.19@gated-at.bofh.it>
2003-07-25 15:37   ` Ihar "Philips" Filipau

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