From: Dave Hansen <dave@linux.vnet.ibm.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Michael J Wolf <mjwolf@us.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [RFC][PATCH 5/6] teach smaps_pte_range() about THP pmds
Date: Tue, 01 Feb 2011 07:02:30 -0800 [thread overview]
Message-ID: <1296572550.27022.2862.camel@nimitz> (raw)
In-Reply-To: <20110201101111.GK19534@cmpxchg.org>
On Tue, 2011-02-01 at 11:11 +0100, Johannes Weiner wrote:
> On Mon, Jan 31, 2011 at 04:34:03PM -0800, Dave Hansen wrote:
> > + if (pmd_trans_huge(*pmd)) {
> > + if (pmd_trans_splitting(*pmd)) {
> > + spin_unlock(&walk->mm->page_table_lock);
> > + wait_split_huge_page(vma->anon_vma, pmd);
> > + spin_lock(&walk->mm->page_table_lock);
> > + goto normal_ptes;
> > + }
> > + smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_SIZE, walk);
> > + return 0;
> > + }
> > +normal_ptes:
> > split_huge_page_pmd(walk->mm, pmd);
>
> This line can go away now...?
I did this because I was unsure what keeps khugepaged away from the
newly-split ptes between the wait_split_huge_page() and the
reacquisition of the mm->page_table_lock. mmap_sem, perhaps?
Looking at follow_page() and some of the other wait_split_huge_page(),
it looks like this is unnecessary.
-- Dave
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next prev parent reply other threads:[~2011-02-01 15:02 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-01 0:33 [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics Dave Hansen
2011-02-01 0:33 ` [RFC][PATCH 1/6] count transparent hugepage splits Dave Hansen
2011-02-01 9:58 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-04 21:18 ` Andrea Arcangeli
2011-02-04 21:28 ` Dave Hansen
2011-02-01 0:33 ` [RFC][PATCH 2/6] pagewalk: only split huge pages when necessary Dave Hansen
2011-02-01 10:04 ` Johannes Weiner
2011-02-01 15:03 ` Dave Hansen
2011-02-03 21:22 ` David Rientjes
2011-02-03 21:33 ` Dave Hansen
2011-02-03 21:46 ` David Rientjes
2011-02-04 17:19 ` Dave Hansen
2011-02-04 21:10 ` Andrea Arcangeli
2011-02-01 0:34 ` [RFC][PATCH 3/6] break out smaps_pte_entry() from smaps_pte_range() Dave Hansen
2011-02-01 10:08 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-03 21:40 ` Dave Hansen
2011-02-01 0:34 ` [RFC][PATCH 4/6] pass pte size argument in to smaps_pte_entry() Dave Hansen
2011-02-01 10:09 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-01 0:34 ` [RFC][PATCH 5/6] teach smaps_pte_range() about THP pmds Dave Hansen
2011-02-01 10:11 ` Johannes Weiner
2011-02-01 15:02 ` Dave Hansen [this message]
2011-02-01 16:09 ` Andrea Arcangeli
2011-02-03 21:22 ` David Rientjes
2011-02-03 21:34 ` Dave Hansen
2011-02-01 0:34 ` [RFC][PATCH 6/6] have smaps show transparent huge pages Dave Hansen
2011-02-01 10:12 ` Johannes Weiner
2011-02-03 21:22 ` David Rientjes
2011-02-01 15:38 ` [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics Andrea Arcangeli
2011-02-01 17:15 ` Dave Hansen
2011-02-01 20:39 ` Andrea Arcangeli
2011-02-01 20:56 ` Dave Hansen
2011-02-02 0:07 ` Andrea Arcangeli
2011-02-08 17:54 ` Dave Hansen
2011-02-08 18:17 ` Andrea Arcangeli
2011-02-03 21:54 ` David Rientjes
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