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mm: don't inline page_mapping() 

According to akpm, this saves 1/2k text and makes things simple for the
next patch.

Numbers from Minchan:

add/remove: 1/0 grow/shrink: 6/22 up/down: 92/-516 (-424)
function                                     old     new   delta
page_mapping                                   -      48     +48
do_task_stat                                2292    2308     +16
page_remove_rmap                             240     248      +8
load_elf_binary                             4500    4508      +8
update_queue                                 532     536      +4
scsi_probe_and_add_lun                      2892    2896      +4
lookup_fast                                  644     648      +4
vcs_read                                    1040    1036      -4
__ip_route_output_key                       1904    1900      -4
ip_route_input_noref                        2508    2500      -8
shmem_file_aio_read                          784     772     -12
__isolate_lru_page                           272     256     -16
shmem_replace_page                           708     688     -20
mark_buffer_dirty                            228     208     -20
__set_page_dirty_buffers                     240     220     -20
__remove_mapping                             276     256     -20
update_mmu_cache                             500     476     -24
set_page_dirty_balance                        92      68     -24
set_page_dirty                               172     148     -24
page_evictable                                88      64     -24
page_cache_pipe_buf_steal                    248     224     -24
clear_page_dirty_for_io                      340     316     -24
test_set_page_writeback                      400     372     -28
test_clear_page_writeback                    516     488     -28
invalidate_inode_page                        156     128     -28
page_mkclean                                 432     400     -32
flush_dcache_page                            360     328     -32
__set_page_dirty_nobuffers                   324     280     -44
shrink_page_list                            2412    2356     -56

Signed-off-by: Shaohua Li <shli@fusionio.com>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Shaohua Li 2013-02-22 16:34:35 -08:00 committed by Linus Torvalds
parent 340ef3902c
commit 9800339b5e
2 changed files with 17 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
include/linux/mm.h
View File

@ -809,18 +809,7 @@ void page_address_init(void);
#define PAGE_MAPPING_KSM 2
#define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM)
extern struct address_space swapper_space;
static inline struct address_space *page_mapping(struct page *page)
{
struct address_space *mapping = page->mapping;
VM_BUG_ON(PageSlab(page));
if (unlikely(PageSwapCache(page)))
mapping = &swapper_space;
else if ((unsigned long)mapping & PAGE_MAPPING_ANON)
mapping = NULL;
return mapping;
}
extern struct address_space *page_mapping(struct page *page);
/* Neutral page->mapping pointer to address_space or anon_vma or other */
static inline void *page_rmapping(struct page *page)

16
mm/util.c
View File

@ -5,6 +5,7 @@
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/security.h>
#include <linux/swap.h>
#include <asm/uaccess.h>
#include "internal.h"
@ -382,6 +383,21 @@ unsigned long vm_mmap(struct file *file, unsigned long addr,
}
EXPORT_SYMBOL(vm_mmap);
struct address_space *page_mapping(struct page *page)
{
struct address_space *mapping = page->mapping;
VM_BUG_ON(PageSlab(page));
#ifdef CONFIG_SWAP
if (unlikely(PageSwapCache(page)))
mapping = &swapper_space;
else
#endif
if ((unsigned long)mapping & PAGE_MAPPING_ANON)
mapping = NULL;
return mapping;
}
/* Tracepoints definitions. */
EXPORT_TRACEPOINT_SYMBOL(kmalloc);
EXPORT_TRACEPOINT_SYMBOL(kmem_cache_alloc);