linux-kernel - Re: [PATCH V2 0/5] arm64/mm: Enable HugeTLB migration

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Date:   Fri, 19 Oct 2018 02:01:01 +0000
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     Anshuman Khandual <anshuman.khandual@....com>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "suzuki.poulose@....com" <suzuki.poulose@....com>,
        "punit.agrawal@....com" <punit.agrawal@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "Steven.Price@....com" <Steven.Price@....com>,
        "steve.capper@....com" <steve.capper@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mike.kravetz@...cle.com" <mike.kravetz@...cle.com>
Subject: Re: [PATCH V2 0/5] arm64/mm: Enable HugeTLB migration

On Wed, Oct 17, 2018 at 01:49:17PM +0530, Anshuman Khandual wrote:
> 
> 
> On 10/12/2018 09:29 AM, Anshuman Khandual wrote:
> > This patch series enables HugeTLB migration support for all supported
> > huge page sizes at all levels including contiguous bit implementation.
> > Following HugeTLB migration support matrix has been enabled with this
> > patch series. All permutations have been tested except for the 16GB.
> > 
> >          CONT PTE    PMD    CONT PMD    PUD
> >          --------    ---    --------    ---
> > 4K:         64K     2M         32M     1G
> > 16K:         2M    32M          1G
> > 64K:         2M   512M         16G
> > 
> > First the series adds migration support for PUD based huge pages. It
> > then adds a platform specific hook to query an architecture if a
> > given huge page size is supported for migration while also providing
> > a default fallback option preserving the existing semantics which just
> > checks for (PMD|PUD|PGDIR)_SHIFT macros. The last two patches enables
> > HugeTLB migration on arm64 and subscribe to this new platform specific
> > hook by defining an override.
> > 
> > The second patch differentiates between movability and migratability
> > aspects of huge pages and implements hugepage_movable_supported() which
> > can then be used during allocation to decide whether to place the huge
> > page in movable zone or not.
> > 
> > Changes in V2:
> > 
> > - Added a new patch which differentiates migratability and movability
> >   of huge pages and implements hugepage_movable_supported() function
> >   as suggested by Michal Hocko.
> 
> Hello Andrew/Michal/Mike/Naoya/Catalin,
> 
> Just checking for an update. Does this series looks okay ?

Looks good to me. So for the series

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>