mm, oom: add description of struct oom_control

Describe the purpose of struct oom_control and what each member does.

Also make gfp_mask and order const since they are never manipulated or
passed to functions that discard the qualifier.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/oom.h b/include/linux/oom.h
index 8fb67b9..03e6257 100644 (file)
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -12,11 +12,25 @@ struct notifier_block;
 struct mem_cgroup;
 struct task_struct;
 
+/*
+ * Details of the page allocation that triggered the oom killer that are used to
+ * determine what should be killed.
+ */
 struct oom_control {
+       /* Used to determine cpuset */
        struct zonelist *zonelist;
-       nodemask_t      *nodemask;
-       gfp_t           gfp_mask;
-       int             order;
+
+       /* Used to determine mempolicy */
+       nodemask_t *nodemask;
+
+       /* Used to determine cpuset and node locality requirement */
+       const gfp_t gfp_mask;
+
+       /*
+        * order == -1 means the oom kill is required by sysrq, otherwise only
+        * for display purposes.
+        */
+       const int order;
 };
 
 /*