From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Zi Yan <zi.yan@sent.com>,
n-horiguchi@ah.jp.nec.com, kirill.shutemov@linux.intel.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: akpm@linux-foundation.org, minchan@kernel.org, vbabka@suse.cz,
mgorman@techsingularity.net, mhocko@kernel.org,
khandual@linux.vnet.ibm.com, zi.yan@cs.rutgers.edu,
dnellans@nvidia.com, Dave Hansen <dave.hansen@intel.com>,
andi.kleen@intel.com
Subject: Re: [PATCH v5 01/11] mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1
Date: Fri, 19 May 2017 18:37:22 +0530 [thread overview]
Message-ID: <9497ce52-dd0d-0c99-2d0f-de980dfbe28e@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170420204752.79703-2-zi.yan@sent.com>
On 04/21/2017 02:17 AM, Zi Yan wrote:
> From: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
>
> pmd_present() checks _PAGE_PSE along with _PAGE_PRESENT to avoid
> false negative return when it races with thp spilt
> (during which _PAGE_PRESENT is temporary cleared.) I don't think that
> dropping _PAGE_PSE check in pmd_present() works well because it can
> hurt optimization of tlb handling in thp split.
> In the current kernel, bits 1-4 are not used in non-present format
> since commit 00839ee3b299 ("x86/mm: Move swap offset/type up in PTE to
> work around erratum"). So let's move _PAGE_SWP_SOFT_DIRTY to bit 1.
> Bit 7 is used as reserved (always clear), so please don't use it for
> other purpose.
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
> Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu>
+Dave Hansen
+Andi Kleen
Dave/Andi/Kiril,
Does this change looks okay ? Its been on the list for some time
now. Could you please have a look into this and lets us know your
inputs/suggestions/comments ? Thank you.
- Anshuman
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next prev parent reply other threads:[~2017-05-19 13:08 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 20:47 [PATCH v5 00/11] mm: page migration enhancement for thp Zi Yan
2017-04-20 20:47 ` [PATCH v5 01/11] mm: x86: move _PAGE_SWP_SOFT_DIRTY from bit 7 to bit 1 Zi Yan
2017-05-19 13:07 ` Anshuman Khandual [this message]
2017-05-19 15:55 ` Dave Hansen
2017-05-19 16:31 ` Zi Yan
2017-05-19 16:36 ` Dave Hansen
2017-04-20 20:47 ` [PATCH v5 02/11] mm: mempolicy: add queue_pages_node_check() Zi Yan
2017-04-21 4:04 ` Anshuman Khandual
2017-05-19 13:13 ` Anshuman Khandual
2017-05-19 16:02 ` Mel Gorman
2017-05-19 16:37 ` Zi Yan
2017-05-19 20:28 ` Mel Gorman
2017-05-19 20:48 ` Zi Yan
2017-05-19 21:39 ` Mel Gorman
2017-04-20 20:47 ` [PATCH v5 03/11] mm: thp: introduce separate TTU flag for thp freezing Zi Yan
2017-04-21 4:29 ` Anshuman Khandual
2017-04-20 20:47 ` [PATCH v5 04/11] mm: thp: introduce CONFIG_ARCH_ENABLE_THP_MIGRATION Zi Yan
2017-04-21 4:36 ` Anshuman Khandual
2017-04-20 20:47 ` [PATCH v5 05/11] mm: thp: enable thp migration in generic path Zi Yan
2017-04-20 20:47 ` [PATCH v5 06/11] mm: thp: check pmd migration entry in common path Zi Yan
2017-04-21 6:17 ` Anshuman Khandual
2017-04-21 15:17 ` Zi Yan
2017-04-20 20:47 ` [PATCH v5 07/11] mm: soft-dirty: keep soft-dirty bits over thp migration Zi Yan
2017-04-20 20:47 ` [PATCH v5 08/11] mm: hwpoison: soft offline supports " Zi Yan
2017-04-21 8:10 ` Anshuman Khandual
2017-04-21 15:55 ` Zi Yan
2017-04-27 4:41 ` Naoya Horiguchi
2017-04-27 16:39 ` Zi Yan
2017-04-20 20:47 ` [PATCH v5 09/11] mm: mempolicy: mbind and migrate_pages support " Zi Yan
2017-04-21 8:22 ` Anshuman Khandual
2017-04-21 16:00 ` Zi Yan
2017-04-20 20:47 ` [PATCH v5 10/11] mm: migrate: move_pages() supports " Zi Yan
2017-04-20 20:47 ` [PATCH v5 11/11] mm: memory_hotplug: memory hotremove " Zi Yan
2017-05-19 13:56 ` Anshuman Khandual
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