From: Huang Shijie <shijie8@gmail.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
akpm@linux-foundation.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm : kill combined_idx
Date: Tue, 22 Dec 2009 11:11:53 +0800 [thread overview]
Message-ID: <4B3038F9.9040701@gmail.com> (raw)
In-Reply-To: <20091221194337.GA23345@csn.ul.ie>
>> Hmm...As far as I remember, this code design was for avoiding "if".
>> Is this compare+jump is better than add+xor ?
>>
>>
>
> Agreed. It's not clear that a compare+jump is cheaper than the add+xor.
> How often it's the case that the page is the higher or lower half of the
> buddy would depend heavily on the allocation/free pattern making it
> hard, if not possible, to predict which is the more common case.
>
>
ok. thanks a lot.
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prev parent reply other threads:[~2009-12-22 3:12 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-21 3:32 [PATCH] mm : kill combined_idx Huang Shijie
2009-12-21 5:31 ` KAMEZAWA Hiroyuki
2009-12-21 19:43 ` Mel Gorman
2009-12-22 3:11 ` Huang Shijie [this message]
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