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mm, oom: replace some information in tasklist dump

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The number of ptes and swap entries are used in the oom killer's badness
heuristic, so they should be shown in the tasklist dump.

This patch adds those fields and replaces cpu and oom_adj values that are
currently emitted.  Cpu isn't interesting and oom_adj is deprecated and
will be removed later this year, the same information is already displayed
as oom_score_adj which is used internally.

At the same time, make the documentation a little more clear to state this
information is helpful to determine why the oom killer chose the task it
did to kill.

Signed-off-by: David Rientjes <rientjes@google.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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 2012-07-31 16:42:56 -07:00 committed by Linus Torvalds
parent 121d1ba0a0
commit de34d965a8
2 changed files with 10 additions and 8 deletions
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7
Documentation/sysctl/vm.txt
View file

@ -491,9 +491,10 @@ oom_dump_tasks
Enables a system-wide task dump (excluding kernel threads) to be
produced when the kernel performs an OOM-killing and includes such
information as pid, uid, tgid, vm size, rss, cpu, oom_adj score, and
name. This is helpful to determine why the OOM killer was invoked
and to identify the rogue task that caused it.
information as pid, uid, tgid, vm size, rss, nr_ptes, swapents,
oom_score_adj score, and name. This is helpful to determine why the
OOM killer was invoked, to identify the rogue task that caused it,
and to determine why the OOM killer chose the task it did to kill.
If this is set to zero, this information is suppressed. On very
large systems with thousands of tasks it may not be feasible to dump

11
mm/oom_kill.c
View file

@ -371,8 +371,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
* Dumps the current memory state of all eligible tasks. Tasks not in the same
* memcg, not in the same cpuset, or bound to a disjoint set of mempolicy nodes
* are not shown.
* State information includes task's pid, uid, tgid, vm size, rss, cpu, oom_adj
* value, oom_score_adj value, and name.
* State information includes task's pid, uid, tgid, vm size, rss, nr_ptes,
* swapents, oom_score_adj value, and name.
*
* Call with tasklist_lock read-locked.
*/
@ -381,7 +381,7 @@ static void dump_tasks(const struct mem_cgroup *memcg, const nodemask_t *nodemas
struct task_struct *p;
struct task_struct *task;
pr_info("[ pid ] uid tgid total_vm rss cpu oom_adj oom_score_adj name\n");
pr_info("[ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name\n");
for_each_process(p) {
if (oom_unkillable_task(p, memcg, nodemask))
continue;
@ -396,10 +396,11 @@ static void dump_tasks(const struct mem_cgroup *memcg, const nodemask_t *nodemas
continue;
}
pr_info("[%5d] %5d %5d %8lu %8lu %3u %3d %5d %s\n",
pr_info("[%5d] %5d %5d %8lu %8lu %7lu %8lu %5d %s\n",
task->pid, from_kuid(&init_user_ns, task_uid(task)),
task->tgid, task->mm->total_vm, get_mm_rss(task->mm),
task_cpu(task), task->signal->oom_adj,
task->mm->nr_ptes,
get_mm_counter(task->mm, MM_SWAPENTS),
task->signal->oom_score_adj, task->comm);
task_unlock(task);
}