linux-kernel - Re: [PATCH V3 1/5] mm/hugetlb: Distinguish between migratability and movability

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Message-ID: <20181108103340.ajeg566spidprzzk@capper-debian.cambridge.arm.com>
Date:   Thu, 8 Nov 2018 10:33:52 +0000
From:   Steve Capper <Steve.Capper@....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 <Suzuki.Poulose@....com>,
        Punit Agrawal <Punit.Agrawal@....com>,
        Will Deacon <Will.Deacon@....com>,
        Steven Price <Steven.Price@....com>,
        Catalin Marinas <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>,
        "n-horiguchi@...jp.nec.com" <n-horiguchi@...jp.nec.com>,
        nd <nd@....com>
Subject: Re: [PATCH V3 1/5] mm/hugetlb: Distinguish between migratability and
 movability

Hi Anshuman,

On Tue, Oct 23, 2018 at 06:31:57PM +0530, Anshuman Khandual wrote:
> During huge page allocation it's migratability is checked to determine if
> it should be placed under movable zones with GFP_HIGHUSER_MOVABLE. But the
> movability aspect of the huge page could depend on other factors than just
> migratability. Movability in itself is a distinct property which should not
> be tied with migratability alone.
> 
> This differentiates these two and implements an enhanced movability check
> which also considers huge page size to determine if it is feasible to be
> placed under a movable zone. At present it just checks for gigantic pages
> but going forward it can incorporate other enhanced checks.
> 
> Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Suggested-by: Michal Hocko <mhocko@...nel.org>
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>

FWIW:
Reviewed-by: Steve Capper <steve.capper@....com>