A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-30 03:27:44 -04:00
Code Issues Projects Releases Packages Wiki Activity

mm: add replace_page_cache_page() function

Browse source 
This function basically does:

     remove_from_page_cache(old);
     page_cache_release(old);
     add_to_page_cache_locked(new);

Except it does this atomically, so there's no possibility for the "add" to
fail because of a race.

If memory cgroups are enabled, then the memory cgroup charge is also moved
from the old page to the new.

This function is currently used by fuse to move pages into the page cache
on read, instead of copying the page contents.

[[email protected]: add freepage() hook to replace_page_cache_page()]
Signed-off-by: Miklos Szeredi <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Acked-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Mel Gorman <[email protected]>
Signed-off-by: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Miklos Szeredi 2011-03-22 16:30:52 -07:00 • committed by Linus Torvalds
commit ef6a3c6311
6 changed files with 80 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

10
fs/fuse/dev.c
View file

@ -737,14 +737,12 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
if (WARN_ON(PageMlocked(oldpage)))
goto out_fallback_unlock;
remove_from_page_cache(oldpage);
page_cache_release(oldpage);
err = add_to_page_cache_locked(newpage, mapping, index, GFP_KERNEL);
err = replace_page_cache_page(oldpage, newpage, GFP_KERNEL);
if (err) {
printk(KERN_WARNING "fuse_try_move_page: failed to add page");
goto out_fallback_unlock;
unlock_page(newpage);
return err;
}
page_cache_get(newpage);
if (!(buf->flags & PIPE_BUF_FLAG_LRU))