From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
linux-kernel@vger.kernel.org, oleg@tv-sign.ru,
ioe-lkml@rameria.de
Subject: Re: [PATCH] de_thread: Use tsk not current.
Date: Tue, 11 Jul 2006 23:08:33 +1000 [thread overview]
Message-ID: <44B3A2D1.2010108@yahoo.com.au> (raw)
In-Reply-To: <20060711031635.a6a1f759.akpm@osdl.org>
Andrew Morton wrote:
> On Mon, 10 Jul 2006 22:42:25 -0600
> ebiederm@xmission.com (Eric W. Biederman) wrote:
>
>
>>Ingo Oeser pointed out that because current expands to an inline function it
>>is more space efficient and somewhat faster to simply keep a cached copy of
>>current in another variable. This patch implements that for the de_thread
>>function.
>>
>>- if (thread_group_empty(current))
>>+ if (thread_group_empty(tsk))
>>- if (unlikely(current->group_leader == child_reaper))
>>- child_reaper = current;
>>+ if (unlikely(tsk->group_leader == child_reaper))
>>+ child_reaper = tsk;
>>- zap_other_threads(current);
>>+ zap_other_threads(tsk);
>> read_unlock(&tasklist_lock);
>>...
>
>
> This saves nearly 100 bytes of text on gcc-4.1.0/i686.
Why can't current be a pure function, I wonder?
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2006-07-11 19:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-11 4:42 [PATCH] de_thread: Use tsk not current Eric W. Biederman
2006-07-11 10:16 ` Andrew Morton
2006-07-11 13:08 ` Nick Piggin [this message]
2006-07-12 8:52 ` Andreas Mohr
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