openstlinux/linux-st
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm, oom: rename zonelist locking functions

Browse Source 
try_set_zonelist_oom() and clear_zonelist_oom() are not named properly
to imply that they require locking semantics to avoid out_of_memory()
being reordered.

zone_scan_lock is required for both functions to ensure that there is
proper locking synchronization.

Rename try_set_zonelist_oom() to oom_zonelist_trylock() and rename
clear_zonelist_oom() to oom_zonelist_unlock() to imply there is proper
locking semantics.

At the same time, convert oom_zonelist_trylock() to return bool instead
of int since only success and failure are tested.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes
2014-08-06 16:07:52 -07:00
committed by Linus Torvalds
parent 8d060bf490
commit e972a070e2
3 changed files with 18 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
mm/page_alloc.c
View File

@ -2246,8 +2246,8 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
{
struct page *page;
/* Acquire the OOM killer lock for the zones in zonelist */
if (!try_set_zonelist_oom(zonelist, gfp_mask)) {
/* Acquire the per-zone oom lock for each zone */
if (!oom_zonelist_trylock(zonelist, gfp_mask)) {
schedule_timeout_uninterruptible(1);
return NULL;
}
@ -2285,7 +2285,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
out_of_memory(zonelist, gfp_mask, order, nodemask, false);
out:
clear_zonelist_oom(zonelist, gfp_mask);
oom_zonelist_unlock(zonelist, gfp_mask);
return page;
}