From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
To: David Rientjes <rientjes@google.com>
Cc: Zhang Yanfei <zhangyanfei.yes@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux MM <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: Add unlikely for current_order test
Date: Mon, 17 Jun 2013 09:53:00 +0800 [thread overview]
Message-ID: <51BE6BFC.3030009@cn.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1306161103020.22688@chino.kir.corp.google.com>
Hi David,
On 06/17/2013 02:04 AM, David Rientjes wrote:
> On Sat, 15 Jun 2013, Zhang Yanfei wrote:
>
>> From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
>>
>> Since we have an unlikely for the "current_order >= pageblock_order / 2"
>> test above, adding an unlikely for this "current_order >= pageblock_order"
>> test seems more appropriate.
>>
>
> I don't understand the justification at all, current_order being unlikely
> greater than or equal to pageblock_order / 2 doesn't imply at all that
> it's unlikely that current_order is greater than or equal to
> pageblock_order.
>
hmmm... I am confused. Since current_order is >= pageblock_order / 2 is unlikely,
why current_order is >= pageblock_order isn't unlikely. Or there are other
tips?
Actually, I am also a little confused about why current_order should be
unlikely greater than or equal to pageblock_order / 2. When borrowing pages
with other migrate_type, we always search from MAX_ORDER-1, which is greater
or equal to pageblock_order.
--
Thanks.
Zhang Yanfei
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WARNING: multiple messages have this Message-ID (diff)
From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
To: David Rientjes <rientjes@google.com>
Cc: Zhang Yanfei <zhangyanfei.yes@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linux MM <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm: Add unlikely for current_order test
Date: Mon, 17 Jun 2013 09:53:00 +0800 [thread overview]
Message-ID: <51BE6BFC.3030009@cn.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1306161103020.22688@chino.kir.corp.google.com>
Hi David,
On 06/17/2013 02:04 AM, David Rientjes wrote:
> On Sat, 15 Jun 2013, Zhang Yanfei wrote:
>
>> From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
>>
>> Since we have an unlikely for the "current_order >= pageblock_order / 2"
>> test above, adding an unlikely for this "current_order >= pageblock_order"
>> test seems more appropriate.
>>
>
> I don't understand the justification at all, current_order being unlikely
> greater than or equal to pageblock_order / 2 doesn't imply at all that
> it's unlikely that current_order is greater than or equal to
> pageblock_order.
>
hmmm... I am confused. Since current_order is >= pageblock_order / 2 is unlikely,
why current_order is >= pageblock_order isn't unlikely. Or there are other
tips?
Actually, I am also a little confused about why current_order should be
unlikely greater than or equal to pageblock_order / 2. When borrowing pages
with other migrate_type, we always search from MAX_ORDER-1, which is greater
or equal to pageblock_order.
--
Thanks.
Zhang Yanfei
next prev parent reply other threads:[~2013-06-17 1:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-15 11:05 [PATCH] mm: Add unlikely for current_order test Zhang Yanfei
2013-06-15 11:05 ` Zhang Yanfei
2013-06-16 18:04 ` David Rientjes
2013-06-16 18:04 ` David Rientjes
2013-06-17 1:53 ` Zhang Yanfei [this message]
2013-06-17 1:53 ` Zhang Yanfei
2013-06-17 21:37 ` David Rientjes
2013-06-17 21:37 ` David Rientjes
2013-06-17 21:56 ` Zhang Yanfei
2013-06-17 21:56 ` Zhang Yanfei
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