Commit cf51518e authored Oct 08, 2013 by Lee Susman Committed by Gerrit - the friendly Code Review server Jun 27, 2015

mm: change max readahead size to 512KB



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>

parent beda946a

include/linux/mm.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -1912,7 +1912,7 @@ int write_one_page(struct page *page, int wait);
		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,