From: Andi Kleen <ak@suse.de>
To: Denis Vlasenko <vda@ilport.com.ua>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [RFC] exit_thread() speedups in x86 process.c
Date: 03 Jul 2005 18:05:03 +0200 [thread overview]
Message-ID: <p738y0ng9jk.fsf@verdi.suse.de> (raw)
In-Reply-To: <200507021456.40667.vda@ilport.com.ua.suse.lists.linux.kernel>
Denis Vlasenko <vda@ilport.com.ua> writes:
>
> 80/20 rule says that 80% of code runs 20% of time,
> thus we need only __fast. Everything else will be by default __slow.
> (IOW: normal .text section is __slow, no need to add another one).
__slow could include noinline. With unit-at-a-time gcc tends
otherwise to inline too aggressively. With __fast that would not be
possible.
-Andi
P.S.: gcc 4.x already supports .cold even on the basic block level.
However I believe it's only active with profile feedback, which is not
practical for kernel builds.
next parent reply other threads:[~2005-07-03 16:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200507012258_MC3-1-A340-3A81@compuserve.com.suse.lists.linux.kernel>
[not found] ` <200507021456.40667.vda@ilport.com.ua.suse.lists.linux.kernel>
2005-07-03 16:05 ` Andi Kleen [this message]
2005-07-05 18:30 William Cohen
-- strict thread matches above, loose matches on Subject: below --
2005-07-02 2:57 Chuck Ebbert
2005-07-02 11:56 ` Denis Vlasenko
2005-07-03 19:59 ` cutaway
2005-06-22 5:48 Chuck Ebbert
2005-06-22 8:41 ` cutaway
2005-06-14 1:16 cutaway
2005-06-14 3:08 ` Coywolf Qi Hunt
2005-06-14 4:26 ` cutaway
2005-06-14 7:43 ` Denis Vlasenko
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