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

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Message-Id: <1540299721-26484-5-git-send-email-anshuman.khandual@arm.com>
Date:   Tue, 23 Oct 2018 18:32:00 +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, punit.agrawal@....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: [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>
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 a8ae30f..4b3e269 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -1331,6 +1331,10 @@ 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