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From: Alexandre Ghiti <aghiti@upmem.com>
To: palmer@sifive.com
Cc: aou@eecs.berkeley.edu, catalin.marinas@arm.com,
	ndesaulniers@google.com, linux-riscv@lists.infradead.org,
	Alexandre Ghiti <aghiti@upmem.com>,
	atish.patra@wdc.com, akpm@linux-foundation.org, mingo@kernel.org,
	mike.kravetz@oracle.com
Subject: [PATCH 3/3] riscv: Adjust mmap base address at a third of task size
Date: Mon, 10 Dec 2018 06:21:46 +0000	[thread overview]
Message-ID: <20181210062146.24951-4-aghiti@upmem.com> (raw)
In-Reply-To: <20181210062146.24951-1-aghiti@upmem.com>

This ratio is the most used among all other architectures and make
icache_hygiene libhugetlbfs test pass: this test mmap lots of
hugepages whose addresses, without this patch, reach the end of
the process user address space.

Signed-off-by: Alexandre Ghiti <aghiti@upmem.com>
---
 arch/riscv/include/asm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 0531f49af5c3..ce70bceb8872 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -22,7 +22,7 @@
  * This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
  */
-#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE >> 1)
+#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE / 3)
 
 #define STACK_TOP		TASK_SIZE
 #define STACK_TOP_MAX		STACK_TOP
-- 
2.16.2


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  parent reply	other threads:[~2018-12-10  6:25 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-10  6:21 [PATCH 0/3] Hugetlbfs support for riscv Alexandre Ghiti
2018-12-10  6:21 ` [PATCH 1/3] riscv: Introduce huge page support for 32/64bit kernel Alexandre Ghiti
2019-01-11  6:18   ` Paul Walmsley
2019-01-11 13:58     ` Alexandre Ghiti
2019-01-15 16:11   ` Christoph Hellwig
2019-01-15 18:52     ` Alex Ghiti
2018-12-10  6:21 ` [PATCH 2/3] riscv: Fix wrong comment about task size for riscv64 Alexandre Ghiti
2019-01-15 15:58   ` Christoph Hellwig
2019-01-15 18:53     ` Alex Ghiti
2019-02-07 12:52       ` Alexandre Ghiti
2018-12-10  6:21 ` Alexandre Ghiti [this message]
2019-01-15 16:02   ` [PATCH 3/3] riscv: Adjust mmap base address at a third of task size Christoph Hellwig
2019-01-15 18:54     ` Alex Ghiti
2019-01-25 19:02       ` Palmer Dabbelt
2019-01-26  9:23         ` Alex Ghiti
2019-01-27 16:57           ` Alex Ghiti
2019-01-28 11:17             ` Alexandre Ghiti
2019-01-07 17:57 ` [PATCH 0/3] Hugetlbfs support for riscv Alex Ghiti
2019-01-07 21:52   ` Paul Walmsley
2019-01-08  9:26     ` Alexandre Ghiti
2019-01-09 18:26   ` Palmer Dabbelt
2019-01-09 19:23 ` Mike Kravetz
2019-01-09 22:15   ` Palmer Dabbelt
2019-01-10  7:33     ` Alex Ghiti
2019-01-10  8:09   ` Alex Ghiti
2019-01-10 18:28     ` Mike Kravetz
2019-01-12  1:09       ` Alex Ghiti
2019-01-15 16:04   ` Christoph Hellwig
2019-01-15 18:56     ` Alex Ghiti
2019-01-15 19:25     ` Mike Kravetz
2019-01-15 20:52       ` Christoph Hellwig
2019-01-16 13:18         ` Alexandre Ghiti

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