From: Matt Mackall <mpm@selenic.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
Andi Kleen <andi@firstfloor.org>,
Wu Fengguang <fengguang.wu@intel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Subject: Re: [PATCH -mmotm] [BUGFIX] pagemap: fix pfn calculation for hugepage
Date: Wed, 24 Mar 2010 11:54:31 -0500 [thread overview]
Message-ID: <1269449671.3552.173.camel@calx> (raw)
In-Reply-To: <20100324054227.GB9336@spritzerA.linux.bs1.fc.nec.co.jp>
On Wed, 2010-03-24 at 14:42 +0900, Naoya Horiguchi wrote:
> When we look into pagemap using page-types with option -p, the value
> of pfn for hugepages looks wrong (see below.)
> This is because pte was evaluated only once for one vma
> although it should be updated for each hugepage. This patch fixes it.
>
> $ page-types -p 3277 -Nl -b huge
> voffset offset len flags
> 7f21e8a00 11e400 1 ___U___________H_G________________
> 7f21e8a01 11e401 1ff ________________TG________________
> ^^^
> 7f21e8c00 11e400 1 ___U___________H_G________________
> 7f21e8c01 11e401 1ff ________________TG________________
> ^^^
>
> One hugepage contains 1 head page and 511 tail pages in x86_64 and
> each two lines represent each hugepage. Voffset and offset mean
> virtual address and physical address in the page unit, respectively.
> The different hugepages should not have the same offset value.
>
> With this patch applied:
>
> $ page-types -p 3386 -Nl -b huge
> voffset offset len flags
> 7fec7a600 112c00 1 ___UD__________H_G________________
> 7fec7a601 112c01 1ff ________________TG________________
> ^^^
> 7fec7a800 113200 1 ___UD__________H_G________________
> 7fec7a801 113201 1ff ________________TG________________
> ^^^
> OK
>
> Changelog:
> - add hugetlb entry walker in mm/pagewalk.c
> (the idea based on Kamezawa-san's patch)
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Looks good to me.
Acked-by: Matt Mackall <mpm@selenic.com>
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prev parent reply other threads:[~2010-03-24 16:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-24 5:42 [PATCH -mmotm] [BUGFIX] pagemap: fix pfn calculation for hugepage Naoya Horiguchi
2010-03-24 5:57 ` KAMEZAWA Hiroyuki
2010-03-25 5:55 ` Naoya Horiguchi
2010-03-24 16:54 ` Matt Mackall [this message]
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