From: Johannes Weiner <hannes@cmpxchg.org>
To: Dave Hansen <dave@linux.vnet.ibm.com>
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, 1 Feb 2011 11:11:11 +0100 [thread overview]
Message-ID: <20110201101111.GK19534@cmpxchg.org> (raw)
In-Reply-To: <20110201003403.736A24DF@kernel>
On Mon, Jan 31, 2011 at 04:34:03PM -0800, Dave Hansen wrote:
>
> This adds code to explicitly detect and handle
> pmd_trans_huge() pmds. It then passes HPAGE_SIZE units
> in to the smap_pte_entry() function instead of PAGE_SIZE.
>
> This means that using /proc/$pid/smaps now will no longer
> cause THPs to be broken down in to small pages.
>
> Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com>
> ---
>
> linux-2.6.git-dave/fs/proc/task_mmu.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff -puN fs/proc/task_mmu.c~teach-smaps_pte_range-about-thp-pmds fs/proc/task_mmu.c
> --- linux-2.6.git/fs/proc/task_mmu.c~teach-smaps_pte_range-about-thp-pmds 2011-01-31 15:10:55.387856566 -0800
> +++ linux-2.6.git-dave/fs/proc/task_mmu.c 2011-01-31 15:25:12.231239775 -0800
> @@ -1,5 +1,6 @@
> #include <linux/mm.h>
> #include <linux/hugetlb.h>
> +#include <linux/huge_mm.h>
> #include <linux/mount.h>
> #include <linux/seq_file.h>
> #include <linux/highmem.h>
> @@ -385,6 +386,17 @@ static int smaps_pte_range(pmd_t *pmd, u
> pte_t *pte;
> spinlock_t *ptl;
>
> + 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...?
Looks good to me, otherwise.
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next prev parent reply other threads:[~2011-02-01 10:11 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 [this message]
2011-02-01 15:02 ` Dave Hansen
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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