From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Tue, 29 Apr 2008 12:11:32 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [RFC][PATCH 5/8] memcg: optimize branches
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To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "balbir@linux.vnet.ibm.com" <balbir@linux.vnet.ibm.com>, "xemul@openvz.org" <xemul@openvz.org>, "hugh@veritas.com" <hugh@veritas.com>, "yamamoto@valinux.co.jp" <yamamoto@valinux.co.jp>
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On Tue, 29 Apr 2008 11:48:32 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> wrote:
> extern void *allocalter(int size);
> extern void call(int arg);
> void *foo(void)
> {
>         char *ptr;
>         ptr = allocator(1024);
>         if (unlikely(!ptr)) {
>                 call(1);
>                 call(2);
>         } else {
>                 call(3);
>                 call(4);
>         }
>         return ptr;
> }
> ==
> When I compiled above with -O2 on ia64,
>  - if unlikely is used , call(3),call(4) are on fast path.
>  - if unlikely is not used, call(1), call(3) are on fast path.
                                       call(2)
Sorry, too many typos in these days ...

Thanks,
-Kame

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