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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Yang Shi <shy828301@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
	Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
	Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
	Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	linux-mm@kvack.org, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH v2 6/8] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 29 Mar 2022 18:43:27 +0200	[thread overview]
Message-ID: <20220329164329.208407-7-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

Let's use bit 52, which is unused.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/s390/include/asm/pgtable.h | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 3982575bb586..a397b072a580 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -181,6 +181,8 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_SOFT_DIRTY 0x000
 #endif
 
+#define _PAGE_SWP_EXCLUSIVE _PAGE_LARGE	/* SW pte exclusive swap bit */
+
 /* Set of bits not changed in pte_modify */
 #define _PAGE_CHG_MASK		(PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
 				 _PAGE_YOUNG | _PAGE_SOFT_DIRTY)
@@ -826,6 +828,22 @@ static inline int pmd_protnone(pmd_t pmd)
 }
 #endif
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return clear_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
 static inline int pte_soft_dirty(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SOFT_DIRTY;
@@ -1715,14 +1733,15 @@ static inline int has_transparent_hugepage(void)
  * Bits 54 and 63 are used to indicate the page type. Bit 53 marks the pte
  * as invalid.
  * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200
- * |			  offset			|X11XX|type |S0|
+ * |			  offset			|E11XX|type |S0|
  * |0000000000111111111122222222223333333333444444444455|55555|55566|66|
  * |0123456789012345678901234567890123456789012345678901|23456|78901|23|
  *
  * Bits 0-51 store the offset.
+ * Bit 52 (E) is used to remember PG_anon_exclusive.
  * Bits 57-61 store the type.
  * Bit 62 (S) is used for softdirty tracking.
- * Bits 52, 55 and 56 (X) are unused.
+ * Bits 55 and 56 (X) are unused.
  */
 
 #define __SWP_OFFSET_MASK	((1UL << 52) - 1)
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Jan Kara <jack@suse.cz>,
	David Hildenbrand <david@redhat.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Yang Shi <shy828301@gmail.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Peter Xu <peterx@redhat.com>, Michal Hocko <mhocko@kernel.org>,
	linux-mm@kvack.org, Donald Dutile <ddutile@redhat.com>,
	Liang Zhang <zhangliang5@huawei.com>,
	Borislav Petkov <bp@alien8.de>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Will Deacon <will@kernel.org>, Christoph Hellwig <hch@lst.de>,
	Paul Mackerras <paulus@samba.org>,
	Andrea Arcangeli <aarcange@redhat.com>,
	linux-s390@vger.kernel.org, Vasily Gorbik <gor@linux.ibm.com>,
	Rik van Riel <riel@surriel.com>, Hugh Dickins <hughd@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Ingo Molnar <mingo@redhat.com>,
	linux-arm-kernel@lists.infradead.org,
	Jason Gunthorpe <jgg@nvidia.com>,
	David Rientjes <rientjes@google.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Jann Horn <jannh@google.com>, John Hubbard <jhubbard@nvidia.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Shakeel Butt <shakeelb@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Vlastimil Babka <vbabka@suse.cz>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	linuxppc-dev@lists.ozlabs.org, Oleg Nesterov <oleg@redhat.com>,
	Nadav Amit <namit@vmware.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Roman Gushchin <guro@fb.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Mike Kravetz <mike.kravetz@oracle.com>
Subject: [PATCH v2 6/8] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 29 Mar 2022 18:43:27 +0200	[thread overview]
Message-ID: <20220329164329.208407-7-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

Let's use bit 52, which is unused.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/s390/include/asm/pgtable.h | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 3982575bb586..a397b072a580 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -181,6 +181,8 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_SOFT_DIRTY 0x000
 #endif
 
+#define _PAGE_SWP_EXCLUSIVE _PAGE_LARGE	/* SW pte exclusive swap bit */
+
 /* Set of bits not changed in pte_modify */
 #define _PAGE_CHG_MASK		(PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
 				 _PAGE_YOUNG | _PAGE_SOFT_DIRTY)
@@ -826,6 +828,22 @@ static inline int pmd_protnone(pmd_t pmd)
 }
 #endif
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return clear_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
 static inline int pte_soft_dirty(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SOFT_DIRTY;
@@ -1715,14 +1733,15 @@ static inline int has_transparent_hugepage(void)
  * Bits 54 and 63 are used to indicate the page type. Bit 53 marks the pte
  * as invalid.
  * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200
- * |			  offset			|X11XX|type |S0|
+ * |			  offset			|E11XX|type |S0|
  * |0000000000111111111122222222223333333333444444444455|55555|55566|66|
  * |0123456789012345678901234567890123456789012345678901|23456|78901|23|
  *
  * Bits 0-51 store the offset.
+ * Bit 52 (E) is used to remember PG_anon_exclusive.
  * Bits 57-61 store the type.
  * Bit 62 (S) is used for softdirty tracking.
- * Bits 52, 55 and 56 (X) are unused.
+ * Bits 55 and 56 (X) are unused.
  */
 
 #define __SWP_OFFSET_MASK	((1UL << 52) - 1)
-- 
2.35.1


WARNING: multiple messages have this Message-ID
From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Hugh Dickins <hughd@google.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	David Rientjes <rientjes@google.com>,
	Shakeel Butt <shakeelb@google.com>,
	John Hubbard <jhubbard@nvidia.com>,
	Jason Gunthorpe <jgg@nvidia.com>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	Mike Rapoport <rppt@linux.ibm.com>,
	Yang Shi <shy828301@gmail.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>, Jann Horn <jannh@google.com>,
	Michal Hocko <mhocko@kernel.org>, Nadav Amit <namit@vmware.com>,
	Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Peter Xu <peterx@redhat.com>, Donald Dutile <ddutile@redhat.com>,
	Christoph Hellwig <hch@lst.de>, Oleg Nesterov <oleg@redhat.com>,
	Jan Kara <jack@suse.cz>, Liang Zhang <zhangliang5@huawei.com>,
	Pedro Gomes <pedrodemargomes@gmail.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	linux-mm@kvack.org, x86@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH v2 6/8] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE
Date: Tue, 29 Mar 2022 18:43:27 +0200	[thread overview]
Message-ID: <20220329164329.208407-7-david@redhat.com> (raw)
In-Reply-To: <20220329164329.208407-1-david@redhat.com>

Let's use bit 52, which is unused.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/s390/include/asm/pgtable.h | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 3982575bb586..a397b072a580 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -181,6 +181,8 @@ static inline int is_module_addr(void *addr)
 #define _PAGE_SOFT_DIRTY 0x000
 #endif
 
+#define _PAGE_SWP_EXCLUSIVE _PAGE_LARGE	/* SW pte exclusive swap bit */
+
 /* Set of bits not changed in pte_modify */
 #define _PAGE_CHG_MASK		(PAGE_MASK | _PAGE_SPECIAL | _PAGE_DIRTY | \
 				 _PAGE_YOUNG | _PAGE_SOFT_DIRTY)
@@ -826,6 +828,22 @@ static inline int pmd_protnone(pmd_t pmd)
 }
 #endif
 
+#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
+static inline int pte_swp_exclusive(pte_t pte)
+{
+	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
+}
+
+static inline pte_t pte_swp_mkexclusive(pte_t pte)
+{
+	return set_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
+static inline pte_t pte_swp_clear_exclusive(pte_t pte)
+{
+	return clear_pte_bit(pte, __pgprot(_PAGE_SWP_EXCLUSIVE));
+}
+
 static inline int pte_soft_dirty(pte_t pte)
 {
 	return pte_val(pte) & _PAGE_SOFT_DIRTY;
@@ -1715,14 +1733,15 @@ static inline int has_transparent_hugepage(void)
  * Bits 54 and 63 are used to indicate the page type. Bit 53 marks the pte
  * as invalid.
  * A swap pte is indicated by bit pattern (pte & 0x201) == 0x200
- * |			  offset			|X11XX|type |S0|
+ * |			  offset			|E11XX|type |S0|
  * |0000000000111111111122222222223333333333444444444455|55555|55566|66|
  * |0123456789012345678901234567890123456789012345678901|23456|78901|23|
  *
  * Bits 0-51 store the offset.
+ * Bit 52 (E) is used to remember PG_anon_exclusive.
  * Bits 57-61 store the type.
  * Bit 62 (S) is used for softdirty tracking.
- * Bits 52, 55 and 56 (X) are unused.
+ * Bits 55 and 56 (X) are unused.
  */
 
 #define __SWP_OFFSET_MASK	((1UL << 52) - 1)
-- 
2.35.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-03-29 16:49 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-29 16:43 [PATCH v2 0/8] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand
2022-03-29 16:43 ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 1/8] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-13  8:58   ` Miaohe Lin
2022-04-13  9:30     ` David Hildenbrand
2022-04-13  9:38       ` Miaohe Lin
2022-04-13 10:46         ` David Hildenbrand
2022-04-13 12:31         ` David Hildenbrand
2022-04-14  2:40           ` Miaohe Lin
2022-04-20 17:10   ` Vlastimil Babka
2022-04-20 17:10     ` Vlastimil Babka
2022-04-20 17:10     ` Vlastimil Babka
2022-04-20 17:13     ` David Hildenbrand
2022-04-20 17:13       ` David Hildenbrand
2022-04-20 17:13       ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 2/8] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-20 17:14   ` Vlastimil Babka
2022-04-20 17:14     ` Vlastimil Babka
2022-04-20 17:14     ` Vlastimil Babka
2022-03-29 16:43 ` [PATCH v2 3/8] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-04-19 12:46   ` David Hildenbrand
2022-04-19 12:46     ` David Hildenbrand
2022-04-19 12:46     ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 4/8] arm64/pgtable: " David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 5/8] s390/pgtable: cleanup description of swp pte layout David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30 16:48   ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-29 16:43 ` David Hildenbrand [this message]
2022-03-29 16:43   ` [PATCH v2 6/8] s390/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30 16:48   ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-30 16:48     ` Gerald Schaefer
2022-03-29 16:43 ` [PATCH v2 7/8] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-30  6:07   ` Christophe Leroy
2022-03-30  6:07     ` Christophe Leroy
2022-03-30  6:07     ` Christophe Leroy
2022-03-30  6:58     ` David Hildenbrand
2022-03-30  6:58       ` David Hildenbrand
2022-03-30  6:58       ` David Hildenbrand
2022-03-29 16:43 ` [PATCH v2 8/8] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE " David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand
2022-03-29 16:43   ` David Hildenbrand

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