From: Mel Gorman <mgorman@suse.de>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Cc: Rik van Riel <riel@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Hugh Dickins <hughd@google.com>, Linux-MM <linux-mm@kvack.org>,
Ingo Molnar <mingo@redhat.com>, Paul Mackerras <paulus@samba.org>,
Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com>,
Sasha Levin <sasha.levin@oracle.com>,
Dave Jones <davej@redhat.com>,
LinuxPPC-dev <linuxppc-dev@lists.ozlabs.org>,
Kirill Shutemov <kirill.shutemov@linux.intel.com>,
Mel Gorman <mgorman@suse.de>
Subject: [PATCH 02/10] mm: Add p[te|md] protnone helpers for use by NUMA balancing
Date: Thu, 20 Nov 2014 10:19:42 +0000 [thread overview]
Message-ID: <1416478790-27522-3-git-send-email-mgorman@suse.de> (raw)
In-Reply-To: <1416478790-27522-1-git-send-email-mgorman@suse.de>
This is a preparatory patch that introduces protnone helpers for automatic
NUMA balancing.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/pgtable.h | 11 +++++++++++
arch/x86/include/asm/pgtable.h | 16 ++++++++++++++++
include/asm-generic/pgtable.h | 19 +++++++++++++++++++
3 files changed, 46 insertions(+)
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 316f9a5..452c3b4 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h
@@ -39,6 +39,17 @@ static inline int pte_none(pte_t pte) { return (pte_val(pte) & ~_PTE_NONE_MASK)
static inline pgprot_t pte_pgprot(pte_t pte) { return __pgprot(pte_val(pte) & PAGE_PROT_BITS); }
#ifdef CONFIG_NUMA_BALANCING
+static inline int pte_protnone_numa(pte_t pte)
+{
+ return (pte_val(pte) &
+ (_PAGE_PRESENT | _PAGE_USER)) == _PAGE_PRESENT;
+}
+
+static inline int pmd_protnone_numa(pmd_t pmd)
+{
+ return pte_protnone_numa(pmd_pte(pmd));
+}
+
static inline int pte_present(pte_t pte)
{
return pte_val(pte) & _PAGE_NUMA_MASK;
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index aa97a07..613cd00 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -497,6 +497,22 @@ static inline int pmd_present(pmd_t pmd)
_PAGE_NUMA);
}
+#ifdef CONFIG_NUMA_BALANCING
+/*
+ * These work without NUMA balancing but the kernel does not care. See the
+ * comment in include/asm-generic/pgtable.h
+ */
+static inline int pte_protnone_numa(pte_t pte)
+{
+ return pte_flags(pte) & _PAGE_PROTNONE;
+}
+
+static inline int pmd_protnone_numa(pmd_t pmd)
+{
+ return pmd_flags(pmd) & _PAGE_PROTNONE;
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
static inline int pmd_none(pmd_t pmd)
{
/* Only check low word on 32-bit platforms, since it might be
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 752e30d..7e74122 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -677,6 +677,25 @@ static inline int pmd_trans_unstable(pmd_t *pmd)
#endif
}
+#ifndef CONFIG_NUMA_BALANCING
+/*
+ * Technically a PTE can be PROTNONE even when not doing NUMA balancing but
+ * the only case the kernel cares is for NUMA balancing. By default,
+ * implement the helper as "always no". Note that this does not check VMA
+ * protection bits meaning that it is up to the caller to distinguish between
+ * PROT_NONE protections and NUMA hinting fault protections.
+ */
+static inline int pte_protnone_numa(pte_t pte)
+{
+ return 0;
+}
+
+static inline int pmd_protnone_numa(pmd_t pmd)
+{
+ return 0;
+}
+#endif /* CONFIG_NUMA_BALANCING */
+
#ifdef CONFIG_NUMA_BALANCING
/*
* _PAGE_NUMA distinguishes between an unmapped page table entry, an entry that
--
2.1.2
next prev parent reply other threads:[~2014-11-20 10:19 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-20 10:19 [PATCH 0/10] Replace _PAGE_NUMA with PAGE_NONE protections v2 Mel Gorman
2014-11-20 10:19 ` [PATCH 01/10] mm: numa: Do not dereference pmd outside of the lock during NUMA hinting fault Mel Gorman
2014-11-20 10:19 ` Mel Gorman [this message]
2014-11-20 19:54 ` [PATCH 02/10] mm: Add p[te|md] protnone helpers for use by NUMA balancing Linus Torvalds
2014-11-21 9:35 ` Mel Gorman
2014-11-20 10:19 ` [PATCH 03/10] mm: Convert p[te|md]_numa users to p[te|md]_protnone_numa Mel Gorman
2014-11-20 10:38 ` David Laight
2014-11-20 10:47 ` Mel Gorman
2014-11-21 5:28 ` Aneesh Kumar K.V
2014-11-20 10:19 ` [PATCH 04/10] ppc64: Add paranoid warnings for unexpected DSISR_PROTFAULT Mel Gorman
2014-11-20 10:19 ` [PATCH 05/10] mm: Convert p[te|md]_mknonnuma and remaining page table manipulations Mel Gorman
2014-11-20 10:19 ` [PATCH 06/10] mm: Remove remaining references to NUMA hinting bits and helpers Mel Gorman
2014-11-20 10:19 ` [PATCH 07/10] mm: numa: Do not trap faults on the huge zero page Mel Gorman
2014-11-20 10:19 ` [PATCH 08/10] x86: mm: Restore original pte_special check Mel Gorman
2014-11-20 10:19 ` [PATCH 09/10] mm: numa: Add paranoid check around pte_protnone_numa Mel Gorman
2014-11-20 10:19 ` [PATCH 10/10] mm: numa: Avoid unnecessary TLB flushes when setting NUMA hinting entries Mel Gorman
2014-11-20 21:50 ` [PATCH 0/10] Replace _PAGE_NUMA with PAGE_NONE protections v2 Sasha Levin
2014-11-21 9:31 ` Mel Gorman
2014-11-21 13:57 [PATCH 0/10] Replace _PAGE_NUMA with PAGE_NONE protections v3 Mel Gorman
2014-11-21 13:57 ` [PATCH 02/10] mm: Add p[te|md] protnone helpers for use by NUMA balancing Mel Gorman
2014-12-01 22:38 ` Benjamin Herrenschmidt
2014-12-02 10:12 ` Mel Gorman
2014-12-04 11:24 [PATCH 0/10] Replace _PAGE_NUMA with PAGE_NONE protections v4 Mel Gorman
2014-12-04 11:24 ` [PATCH 02/10] mm: Add p[te|md] protnone helpers for use by NUMA balancing Mel Gorman
2015-01-05 10:54 [PATCH 0/10] Replace _PAGE_NUMA with PAGE_NONE protections v5 Mel Gorman
2015-01-05 10:54 ` [PATCH 02/10] mm: Add p[te|md] protnone helpers for use by NUMA balancing Mel Gorman
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