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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>
[vinmenon@codeaurora.org: switch to VM_READAHEAD_PAGES on 5.4]
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
commit 87e7e1b2ec
1 changed files with 1 additions and 1 deletions
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2
include/linux/mm.h
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@ -2542,7 +2542,7 @@ int __must_check write_one_page(struct page *page);
void task_dirty_inc(struct task_struct *tsk);
/* readahead.c */
#define VM_READAHEAD_PAGES (SZ_128K / PAGE_SIZE)
#define VM_READAHEAD_PAGES (SZ_512K / PAGE_SIZE)
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
pgoff_t offset, unsigned long nr_to_read);