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From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Will Deacon <will@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Peter Zijlstra <peterz@infradead.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	sparclinux@vger.kernel.org, kernel-team@android.com
Subject: [RESEND PATCH 4/4] sparc32: mm: Reduce allocation size for PMD and PTE tables
Date: Tue, 14 Apr 2020 22:40:11 +0100	[thread overview]
Message-ID: <20200414214011.2699-5-will@kernel.org> (raw)
In-Reply-To: <20200414214011.2699-1-will@kernel.org>

Now that the page table allocator can free page table allocations
smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations
to avoid needlessly wasting memory.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Will Deacon <will@kernel.org>
---
 arch/sparc/include/asm/pgtsrmmu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h
index 58ea8e8c6ee7..7708d015712b 100644
--- a/arch/sparc/include/asm/pgtsrmmu.h
+++ b/arch/sparc/include/asm/pgtsrmmu.h
@@ -17,8 +17,8 @@
 /* Number of contexts is implementation-dependent; 64k is the most we support */
 #define SRMMU_MAX_CONTEXTS	65536
 
-#define SRMMU_PTE_TABLE_SIZE		(PAGE_SIZE)
-#define SRMMU_PMD_TABLE_SIZE		(PAGE_SIZE)
+#define SRMMU_PTE_TABLE_SIZE		(PTRS_PER_PTE*4)
+#define SRMMU_PMD_TABLE_SIZE		(PTRS_PER_PMD*4)
 #define SRMMU_PGD_TABLE_SIZE		(PTRS_PER_PGD*4)
 
 /* Definition of the values in the ET field of PTD's and PTE's */
-- 
2.26.0.110.g2183baf09c-goog


WARNING: multiple messages have this Message-ID (diff)
From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: Will Deacon <will@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Peter Zijlstra <peterz@infradead.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	sparclinux@vger.kernel.org, kernel-team@android.com
Subject: [RESEND PATCH 4/4] sparc32: mm: Reduce allocation size for PMD and PTE tables
Date: Tue, 14 Apr 2020 21:40:11 +0000	[thread overview]
Message-ID: <20200414214011.2699-5-will@kernel.org> (raw)
In-Reply-To: <20200414214011.2699-1-will@kernel.org>

Now that the page table allocator can free page table allocations
smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations
to avoid needlessly wasting memory.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Will Deacon <will@kernel.org>
---
 arch/sparc/include/asm/pgtsrmmu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h
index 58ea8e8c6ee7..7708d015712b 100644
--- a/arch/sparc/include/asm/pgtsrmmu.h
+++ b/arch/sparc/include/asm/pgtsrmmu.h
@@ -17,8 +17,8 @@
 /* Number of contexts is implementation-dependent; 64k is the most we support */
 #define SRMMU_MAX_CONTEXTS	65536
 
-#define SRMMU_PTE_TABLE_SIZE		(PAGE_SIZE)
-#define SRMMU_PMD_TABLE_SIZE		(PAGE_SIZE)
+#define SRMMU_PTE_TABLE_SIZE		(PTRS_PER_PTE*4)
+#define SRMMU_PMD_TABLE_SIZE		(PTRS_PER_PMD*4)
 #define SRMMU_PGD_TABLE_SIZE		(PTRS_PER_PGD*4)
 
 /* Definition of the values in the ET field of PTD's and PTE's */
-- 
2.26.0.110.g2183baf09c-goog

  parent reply	other threads:[~2020-04-14 21:41 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-14 21:40 [RESEND PATCH 0/4] Rework sparc32 page-table layout Will Deacon
2020-04-14 21:40 ` Will Deacon
2020-04-14 21:40 ` [RESEND PATCH 1/4] sparc32: mm: Fix argument checking in __srmmu_get_nocache() Will Deacon
2020-04-14 21:40   ` Will Deacon
2020-04-14 21:40 ` [RESEND PATCH 2/4] sparc32: mm: Restructure sparc32 MMU page-table layout Will Deacon
2020-04-14 21:40   ` Will Deacon
2020-04-14 21:40 ` [RESEND PATCH 3/4] sparc32: mm: Change pgtable_t type to pte_t * instead of struct page * Will Deacon
2020-04-14 21:40   ` Will Deacon
2020-04-14 21:40 ` Will Deacon [this message]
2020-04-14 21:40   ` [RESEND PATCH 4/4] sparc32: mm: Reduce allocation size for PMD and PTE tables Will Deacon
2020-05-13 22:32 ` [RESEND PATCH 0/4] Rework sparc32 page-table layout David Miller
2020-05-13 22:32   ` David Miller
2020-05-14  7:26   ` Will Deacon
2020-05-14  7:26     ` Will Deacon
2020-05-15  0:41     ` David Miller
2020-05-15  0:41       ` David Miller

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