diff options
| author | Shaohua Li <shli@kernel.org> | 2013-02-23 04:34:35 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 05:50:17 +0400 |
| commit | 9800339b5e0f0e24ab3dac349e0de80d2018832e (patch) | |
| tree | 7f0cc5d46cbf881729ff3b2d97f425570674c95d /mm | |
| parent | 340ef3902cf20cec43cdcd1e72ae5cb518be7328 (diff) | |
| download | linux-9800339b5e0f0e24ab3dac349e0de80d2018832e.tar.xz | |
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/util.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/util.c b/mm/util.c index 3704bf1bef94..16a73195a37b 100644 --- a/mm/util.c +++ b/mm/util.c @@ -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); |