From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@intel.com>,
Hugh Dickins <hughd@google.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Jerome Marchand <jmarchan@redhat.com>,
linux-kernel@vger.kernel.org,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Pavel Emelyanov <xemul@parallels.com>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH -mm v5 12/13] mm: /proc/pid/clear_refs: avoid split_huge_page()
Date: Mon, 14 Jul 2014 10:40:19 +0400 [thread overview]
Message-ID: <20140714064019.GF19702@moon> (raw)
In-Reply-To: <1405103749-23506-13-git-send-email-n-horiguchi@ah.jp.nec.com>
On Fri, Jul 11, 2014 at 02:35:48PM -0400, Naoya Horiguchi wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> Currently pagewalker splits all THP pages on any clear_refs request. It's
> not necessary. We can handle this on PMD level.
>
> One side effect is that soft dirty will potentially see more dirty memory,
> since we will mark whole THP page dirty at once.
>
> Sanity checked with CRIU test suite. More testing is required.
>
> ChangeLog:
> - move code for thp to clear_refs_pte_range()
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Pavel Emelyanov <xemul@parallels.com>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Cc: Cyrill Gorcunov <gorcunov@gmail.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
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WARNING: multiple messages have this Message-ID (diff)
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@intel.com>,
Hugh Dickins <hughd@google.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Jerome Marchand <jmarchan@redhat.com>,
linux-kernel@vger.kernel.org,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Pavel Emelyanov <xemul@parallels.com>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH -mm v5 12/13] mm: /proc/pid/clear_refs: avoid split_huge_page()
Date: Mon, 14 Jul 2014 10:40:19 +0400 [thread overview]
Message-ID: <20140714064019.GF19702@moon> (raw)
In-Reply-To: <1405103749-23506-13-git-send-email-n-horiguchi@ah.jp.nec.com>
On Fri, Jul 11, 2014 at 02:35:48PM -0400, Naoya Horiguchi wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
>
> Currently pagewalker splits all THP pages on any clear_refs request. It's
> not necessary. We can handle this on PMD level.
>
> One side effect is that soft dirty will potentially see more dirty memory,
> since we will mark whole THP page dirty at once.
>
> Sanity checked with CRIU test suite. More testing is required.
>
> ChangeLog:
> - move code for thp to clear_refs_pte_range()
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Pavel Emelyanov <xemul@parallels.com>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Dave Hansen <dave.hansen@intel.com>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Cc: Cyrill Gorcunov <gorcunov@gmail.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
next prev parent reply other threads:[~2014-07-14 6:40 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-11 18:35 [PATCH -mm v5 00/13] pagewalk: improve vma handling, apply to new users Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 01/13] mm/pagewalk: remove pgd_entry() and pud_entry() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 02/13] pagewalk: improve vma handling Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 03/13] pagewalk: add walk_page_vma() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 04/13] smaps: remove mem_size_stats->vma and use walk_page_vma() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 05/13] clear_refs: remove clear_refs_private->vma and introduce clear_refs_test_walk() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 06/13] pagemap: use walk->vma instead of calling find_vma() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 07/13] numa_maps: fix typo in gather_hugetbl_stats Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 08/13] numa_maps: remove numa_maps->vma Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 09/13] memcg: cleanup preparation for page table walk Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 10/13] arch/powerpc/mm/subpage-prot.c: use walk->vma and walk_page_vma() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 11/13] mempolicy: apply page table walker on queue_pages_range() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-11 18:35 ` [PATCH -mm v5 12/13] mm: /proc/pid/clear_refs: avoid split_huge_page() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
2014-07-14 6:40 ` Cyrill Gorcunov [this message]
2014-07-14 6:40 ` Cyrill Gorcunov
2014-07-11 18:35 ` [PATCH -mm v5 13/13] mincore: apply page table walker on do_mincore() Naoya Horiguchi
2014-07-11 18:35 ` Naoya Horiguchi
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