From: Andrew Morton <akpm@osdl.org>
To: Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com>
Cc: haveblue@us.ibm.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, lhms-devel@lists.sourceforge.net,
wli@holomorphy.com
Subject: Re: [Lhms-devel] [RFC] buddy allocator without bitmap [2/4]
Date: Thu, 26 Aug 2004 17:18:40 -0700 [thread overview]
Message-ID: <20040826171840.4a61e80d.akpm@osdl.org> (raw)
In-Reply-To: <412E6CC3.8060908@jp.fujitsu.com>
Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com> wrote:
>
> In the previous version, I used SetPagePrivate()/ClearPagePrivate()/PagePrivate().
> But these are "atomic" operation and looks very slow.
> This is why I doesn't used these macros in this version.
>
> My previous version, which used set_bit/test_bit/clear_bit, shows very bad performance
> on my test, and I replaced it.
That's surprising. But if you do intend to use non-atomic bitops then
please add __SetPagePrivate() and __ClearPagePrivate()
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next prev parent reply other threads:[~2004-08-27 0:18 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-26 12:03 Hiroyuki KAMEZAWA
2004-08-26 15:50 ` [Lhms-devel] " Dave Hansen
2004-08-26 23:05 ` Hiroyuki KAMEZAWA
2004-08-26 23:11 ` Dave Hansen
2004-08-26 23:28 ` Hiroyuki KAMEZAWA
2004-08-27 0:18 ` Andrew Morton [this message]
2004-08-27 0:27 ` Hiroyuki KAMEZAWA
2004-08-27 4:48 ` Hiroyuki KAMEZAWA
2004-08-27 4:59 ` Andrew Morton
2004-08-27 5:20 ` Hiroyuki KAMEZAWA
2004-08-27 5:04 ` Dave Hansen
2004-08-27 5:31 ` Hiroyuki KAMEZAWA
2004-08-27 5:31 ` Dave Hansen
2004-08-27 5:47 ` Dave Hansen
2004-08-27 6:09 ` Hiroyuki KAMEZAWA
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