linux-kernel - [RESEND PATCH V3 4/5] arm64/mm: Enable HugeTLB migration

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Message-Id: <1545121450-1663-5-git-send-email-anshuman.khandual@arm.com>
Date:   Tue, 18 Dec 2018 13:54:09 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-mm@...ck.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     suzuki.poulose@....com, will.deacon@....com, Steven.Price@....com,
        steve.capper@....com, catalin.marinas@....com, mhocko@...nel.org,
        akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        n-horiguchi@...jp.nec.com
Subject: [RESEND PATCH V3 4/5] arm64/mm: Enable HugeTLB migration

Let arm64 subscribe to generic HugeTLB page migration framework. Right now
this only works on the following PMD and PUD level HugeTLB page sizes with
various kernel base page size combinations.

       CONT PTE    PMD    CONT PMD    PUD
       --------    ---    --------    ---
4K:         NA     2M         NA      1G
16K:        NA    32M         NA
64K:        NA   512M         NA

Reviewed-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Reviewed-by: Steve Capper <steve.capper@....com>
Acked-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
 arch/arm64/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index ea2ab03..57d0c4bf 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1359,6 +1359,10 @@ config SYSVIPC_COMPAT
 	def_bool y
 	depends on COMPAT && SYSVIPC
 
+config ARCH_ENABLE_HUGEPAGE_MIGRATION
+	def_bool y
+	depends on HUGETLB_PAGE && MIGRATION
+
 menu "Power management options"
 
 source "kernel/power/Kconfig"
-- 
2.7.4