linux-kernel - Re: [PATCH 1/3]fs/inode: iunique() Optimize Performance

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Message-ID: <87pr76ve35.fsf@basil.nowhere.org>
Date:	Wed, 25 Nov 2009 16:06:22 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	"Liuweni" <qingshenlwy@...il.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"strongzgy" <strongzgy@...il.com>, "xgr178" <xgr178@....com>,
	"Liu Hui" <onlyflyer@...il.com>, "viro" <viro@...iv.linux.org.uk>,
	"akpm" <akpm@...ux-foundation.org>, "jack" <jack@...e.cz>,
	"npiggin" <npiggin@...e.de>,
	"linux-fsdevel" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 1/3]fs/inode: iunique() Optimize Performance

"Liuweni" <qingshenlwy@...il.com> writes:

> ---
> move the if condition out the while{}.
> While the function executing, the if 
> condition won't check again and again.
> And this code won't change the function
> of iunique().

Normally compiler automatically move loop invariant code out of loop
bodies. Have you verified that's not the case here?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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