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readahead: compacting file_ra_state

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Use 'unsigned int' instead of 'unsigned long' for readahead sizes.

This helps reduce memory consumption on 64bit CPU when a lot of files are
opened.

CC: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Fengguang Wu
2007-10-16 01:24:31 -07:00
committed by Linus Torvalds
parent 43fac94dd6
commit 937085aa35
2 changed files with 5 additions and 5 deletions
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6
include/linux/fs.h
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@@ -698,11 +698,11 @@ struct fown_struct {
*/ */
struct file_ra_state { struct file_ra_state {
pgoff_t start; /* where readahead started */ pgoff_t start; /* where readahead started */
unsigned long size; /* # of readahead pages */ unsigned int size; /* # of readahead pages */
unsigned long async_size; /* do asynchronous readahead when unsigned int async_size; /* do asynchronous readahead when
there are only # of pages ahead */ there are only # of pages ahead */
unsigned long ra_pages; /* Maximum readahead window */ unsigned int ra_pages; /* Maximum readahead window */
unsigned long mmap_hit; /* Cache hit stat for mmap accesses */ unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
unsigned long mmap_miss; /* Cache miss stat for mmap accesses */ unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
unsigned long prev_index; /* Cache last read() position */ unsigned long prev_index; /* Cache last read() position */

2
mm/readahead.c
View File

@@ -351,7 +351,7 @@ ondemand_readahead(struct address_space *mapping,
bool hit_readahead_marker, pgoff_t offset, bool hit_readahead_marker, pgoff_t offset,
unsigned long req_size) unsigned long req_size)
{ {
unsigned long max; /* max readahead pages */ int max; /* max readahead pages */
int sequential; int sequential;
max = ra->ra_pages; max = ra->ra_pages;