LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: suzuki.poulose@arm.com, punit.agrawal@arm.com,
	will.deacon@arm.com, Steven.Price@arm.com, steve.capper@arm.com,
	catalin.marinas@arm.com, mhocko@kernel.org,
	akpm@linux-foundation.org, mike.kravetz@oracle.com,
	n-horiguchi@ah.jp.nec.com
Subject: [PATCH V3 5/5] arm64/mm: Enable HugeTLB migration for contiguous bit HugeTLB pages
Date: Tue, 23 Oct 2018 18:32:01 +0530	[thread overview]
Message-ID: <1540299721-26484-6-git-send-email-anshuman.khandual@arm.com> (raw)
In-Reply-To: <1540299721-26484-1-git-send-email-anshuman.khandual@arm.com>

Let arm64 subscribe to the previously added framework in which architecture
can inform whether a given huge page size is supported for migration. This
just overrides the default function arch_hugetlb_migration_supported() and
enables migration for all possible HugeTLB page sizes on arm64. With this,
HugeTLB migration support on arm64 now covers all possible HugeTLB options.

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

Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/include/asm/hugetlb.h |  5 +++++
 arch/arm64/mm/hugetlbpage.c      | 20 ++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h
index e73f685..656f70e 100644
--- a/arch/arm64/include/asm/hugetlb.h
+++ b/arch/arm64/include/asm/hugetlb.h
@@ -20,6 +20,11 @@
 
 #include <asm/page.h>
 
+#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
+#define arch_hugetlb_migration_supported arch_hugetlb_migration_supported
+extern bool arch_hugetlb_migration_supported(struct hstate *h);
+#endif
+
 static inline pte_t huge_ptep_get(pte_t *ptep)
 {
 	return READ_ONCE(*ptep);
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 21512ca..f3afdcf 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -27,6 +27,26 @@
 #include <asm/tlbflush.h>
 #include <asm/pgalloc.h>
 
+#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
+bool arch_hugetlb_migration_supported(struct hstate *h)
+{
+	size_t pagesize = huge_page_size(h);
+
+	switch (pagesize) {
+#ifdef CONFIG_ARM64_4K_PAGES
+	case PUD_SIZE:
+#endif
+	case PMD_SIZE:
+	case CONT_PMD_SIZE:
+	case CONT_PTE_SIZE:
+		return true;
+	}
+	pr_warn("%s: unrecognized huge page size 0x%lx\n",
+			__func__, pagesize);
+	return false;
+}
+#endif
+
 int pmd_huge(pmd_t pmd)
 {
 	return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
-- 
2.7.4


  parent reply	other threads:[~2018-10-23 13:02 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-23 13:01 [PATCH V3 0/5] arm64/mm: Enable HugeTLB migration Anshuman Khandual
2018-10-23 13:01 ` [PATCH V3 1/5] mm/hugetlb: Distinguish between migratability and movability Anshuman Khandual
2018-10-24 13:54   ` Michal Hocko
2018-11-08 10:33   ` Steve Capper
2018-10-23 13:01 ` [PATCH V3 2/5] mm/hugetlb: Enable PUD level huge page migration Anshuman Khandual
2018-11-08 10:34   ` Steve Capper
2018-10-23 13:01 ` [PATCH V3 3/5] mm/hugetlb: Enable arch specific huge page size support for migration Anshuman Khandual
2018-10-24 13:56   ` Michal Hocko
2018-10-24 13:58     ` Michal Hocko
2018-10-25  6:23       ` Anshuman Khandual
2018-10-25  7:45         ` Michal Hocko
2018-11-08 10:35   ` Steve Capper
2018-10-23 13:02 ` [PATCH V3 4/5] arm64/mm: Enable HugeTLB migration Anshuman Khandual
2018-11-08 10:35   ` Steve Capper
2018-11-23 14:42   ` Catalin Marinas
2018-10-23 13:02 ` Anshuman Khandual [this message]
2018-11-08 10:36   ` [PATCH V3 5/5] arm64/mm: Enable HugeTLB migration for contiguous bit HugeTLB pages Steve Capper
2018-11-23 14:42   ` Catalin Marinas
2018-11-23 15:08 ` [PATCH V3 0/5] arm64/mm: Enable HugeTLB migration Anshuman Khandual

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1540299721-26484-6-git-send-email-anshuman.khandual@arm.com \
    --to=anshuman.khandual@arm.com \
    --cc=Steven.Price@arm.com \
    --cc=akpm@linux-foundation.org \
    --cc=catalin.marinas@arm.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mhocko@kernel.org \
    --cc=mike.kravetz@oracle.com \
    --cc=n-horiguchi@ah.jp.nec.com \
    --cc=punit.agrawal@arm.com \
    --cc=steve.capper@arm.com \
    --cc=suzuki.poulose@arm.com \
    --cc=will.deacon@arm.com \
    --subject='Re: [PATCH V3 5/5] arm64/mm: Enable HugeTLB migration for contiguous bit HugeTLB pages' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).