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Commit 535443f5 authored by Fengguang Wu's avatar Fengguang Wu Committed by Linus Torvalds
Browse files

readahead: remove several readahead macros 



Remove VM_MAX_CACHE_HIT, MAX_RA_PAGES and MIN_RA_PAGES.

Signed-off-by: default avatarFengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7ff81078

include/linux/mm.h

+0 −2
Original line number Diff line number Diff line
@@ -1106,8 +1106,6 @@ int write_one_page(struct page *page, int wait); 
/* readahead.c */

#define VM_MAX_READAHEAD	128	/* kbytes */

#define VM_MIN_READAHEAD	16	/* kbytes (includes current page) */

#define VM_MAX_CACHE_HIT    	256	/* max pages in a row in cache before

					 * turning readahead off */



int do_page_cache_readahead(struct address_space *mapping, struct file *filp,

			pgoff_t offset, unsigned long nr_to_read);

mm/readahead.c

+1 −9
Original line number Diff line number Diff line
@@ -22,16 +22,8 @@ void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) 
}

EXPORT_SYMBOL(default_unplug_io_fn);



/*

 * Convienent macros for min/max read-ahead pages.

 * Note that MAX_RA_PAGES is rounded down, while MIN_RA_PAGES is rounded up.

 * The latter is necessary for systems with large page size(i.e. 64k).

 */

#define MAX_RA_PAGES	(VM_MAX_READAHEAD*1024 / PAGE_CACHE_SIZE)

#define MIN_RA_PAGES	DIV_ROUND_UP(VM_MIN_READAHEAD*1024, PAGE_CACHE_SIZE)



struct backing_dev_info default_backing_dev_info = {

	.ra_pages	= MAX_RA_PAGES,

	.ra_pages	= VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,

	.state		= 0,

	.capabilities	= BDI_CAP_MAP_COPY,

	.unplug_io_fn	= default_unplug_io_fn,