tmpfs: convert mem_cgroup shmem to radix-swap
commitaa3b189551ad8e5cc1d9c663735c131650238278
authorHugh Dickins <hughd@google.com>
Wed, 3 Aug 2011 23:21:24 +0000 (3 16:21 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 4 Aug 2011 00:25:24 +0000 (3 14:25 -1000)
treec789ab5c7f890a6065811d8bba15a784caf9e859
parent54af60421822bb9cb664dd5cd7aac46c01ccfcf8
tmpfs: convert mem_cgroup shmem to radix-swap

Remove mem_cgroup_shmem_charge_fallback(): it was only required when we
had to move swappage to filecache with GFP_NOWAIT.

Remove the GFP_NOWAIT special case from mem_cgroup_cache_charge(), by
moving its call out from shmem_add_to_page_cache() to two of thats three
callers.  But leave it doing mem_cgroup_uncharge_cache_page() on error:
although asymmetrical, it's easier for all 3 callers to handle.

These two changes would also be appropriate if anyone were to start
using shmem_read_mapping_page_gfp() with GFP_NOWAIT.

Remove mem_cgroup_get_shmem_target(): mc_handle_file_pte() can test
radix_tree_exceptional_entry() to get what it needs for itself.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/memcontrol.h
include/linux/shmem_fs.h
mm/memcontrol.c
mm/shmem.c