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MIPS: topdown mmap support

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This patch introduced topdown mmap support in user process address
space allocation policy.

Recently, we ran some large applications that use mmap heavily and
lead to OOM due to inflexible mmap allocation policy on MIPS32.

Since most other major archs supported it for years, it is reasonable
to follow the trend and reduce the pain of porting applications.

Due to cache aliasing concern, arch_get_unmapped_area_topdown() and
other helper functions are implemented in arch/mips/kernel/syscall.c.

Signed-off-by: Jian Peng <jipeng2005@gmail.com>
Cc: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2389/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jian Peng 2011-05-17 12:27:49 -07:00 • committed by Ralf Baechle
parent 3a7136602b
commit d0be89f6c2
2 changed files with 174 additions and 26 deletions
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1
arch/mips/include/asm/pgtable.h
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@ -414,6 +414,7 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
* constraints placed on us by the cache architecture.
*/
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
/*
* No page table caches to initialise