https://github.com/torvalds/linux
Revision e8a03feb54ca7f1768bbdc2b491f9ef654e6d01d authored by Rik van Riel on 14 April 2010, 21:59:28 UTC, committed by Linus Torvalds on 19 April 2010, 23:28:20 UTC
The recent anon_vma fixes cause many anonymous pages to end up in the parent process anon_vma, even when the page is exclusively owned by the current process. Adding exclusively owned anonymous pages to the top anon_vma reduces rmap scanning overhead, especially in workloads with forking servers. This patch adds a parameter to __page_set_anon_rmap that can be used to indicate whether or not the added page is exclusively owned by the current process. Pages added through page_add_new_anon_rmap are exclusively owned by the current process, and can be added to the top anon_vma. Pages added through page_add_anon_rmap can be either shared or exclusively owned, so we do the conservative thing and add it to the oldest anon_vma. A next step would be to add the exclusive parameter to page_add_anon_rmap, to be used from functions where we do know for sure whether a page is exclusively owned. Signed-off-by: Rik van Riel <riel@redhat.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Lightly-tested-by: Borislav Petkov <bp@alien8.de> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> [ Edited to look nicer - Linus ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 9b030e2
Tip revision: e8a03feb54ca7f1768bbdc2b491f9ef654e6d01d authored by Rik van Riel on 14 April 2010, 21:59:28 UTC
rmap: add exclusively owned pages to the newest anon_vma
rmap: add exclusively owned pages to the newest anon_vma
Tip revision: e8a03fe
File | Mode | Size |
---|---|---|
Kconfig | -rw-r--r-- | 2.0 KB |
Makefile | -rw-r--r-- | 232 bytes |
block.c | -rw-r--r-- | 5.3 KB |
cache.c | -rw-r--r-- | 10.9 KB |
decompressor.c | -rw-r--r-- | 2.0 KB |
decompressor.h | -rw-r--r-- | 1.7 KB |
dir.c | -rw-r--r-- | 6.0 KB |
export.c | -rw-r--r-- | 4.4 KB |
file.c | -rw-r--r-- | 13.9 KB |
fragment.c | -rw-r--r-- | 3.0 KB |
id.c | -rw-r--r-- | 2.7 KB |
inode.c | -rw-r--r-- | 10.2 KB |
namei.c | -rw-r--r-- | 7.2 KB |
squashfs.h | -rw-r--r-- | 3.3 KB |
squashfs_fs.h | -rw-r--r-- | 9.1 KB |
squashfs_fs_i.h | -rw-r--r-- | 1.2 KB |
squashfs_fs_sb.h | -rw-r--r-- | 2.0 KB |
super.c | -rw-r--r-- | 12.3 KB |
symlink.c | -rw-r--r-- | 3.5 KB |
zlib_wrapper.c | -rw-r--r-- | 3.5 KB |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...