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mm: change max readahead size to 512KB

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Change the VM_MAX_READAHEAD value from the default 128KB
to 512KB. This will allow the readahead window to grow to a maximum size
of 512KB, which greatly benefits to sequential read throughput.

Change-Id: Ia0780ea4e2a4ae0b6111485b72fb25376dcb1f96
Signed-off-by: Lee Susman <lsusman@codeaurora.org>
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
Lee Susman
2013-10-08 09:47:59 +03:00
committed by Gerrit - the friendly Code Review server
parent 54f3590aa0
commit 25d04e4ceb
1 changed files with 1 additions and 1 deletions
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2
include/linux/mm.h
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@ -2500,7 +2500,7 @@ int __must_check write_one_page(struct page *page);
void task_dirty_inc(struct task_struct *tsk);
/* readahead.c */
#define VM_MAX_READAHEAD 128 /* kbytes */
#define VM_MAX_READAHEAD 512 /* kbytes */
#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,