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readahead: remove the old algorithm

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Remove the old readahead algorithm.

Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Cc: Steven Pratt <slpratt@austin.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
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
2007-07-19 01:48:04 -07:00
committed by Linus Torvalds
parent dc7868fcb9
commit c743d96b6d
3 changed files with 26 additions and 365 deletions
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11
include/linux/fs.h
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@@ -701,14 +701,6 @@ struct fown_struct {
* file_ra_state.la_index .ra_index .lookahead_index .readahead_index
*/
struct file_ra_state {
unsigned long start; /* Current window */
unsigned long size;
unsigned long flags; /* ra flags RA_FLAG_xxx*/
unsigned long cache_hit; /* cache hit count*/
unsigned long prev_index; /* Cache last read() position */
unsigned long ahead_start; /* Ahead window */
unsigned long ahead_size;
pgoff_t la_index; /* enqueue time */
pgoff_t ra_index; /* begin offset */
pgoff_t lookahead_index; /* time to do next readahead */
@@ -717,10 +709,9 @@ struct file_ra_state {
unsigned long ra_pages; /* Maximum readahead window */
unsigned long mmap_hit; /* Cache hit stat for mmap accesses */
unsigned long mmap_miss; /* Cache miss stat for mmap accesses */
unsigned long prev_index; /* Cache last read() position */
unsigned int prev_offset; /* Offset where last read() ended in a page */
};
#define RA_FLAG_MISS 0x01 /* a cache miss occured against this file */
#define RA_FLAG_INCACHE 0x02 /* file is already in cache */
/*
* Measuring read-ahead sizes.