linux-kernel - [RFC PATCH v2 3/7] mm, oom: export oom_evaluate_task() and select_bad

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Date:   Thu, 1 Jun 2017 19:35:11 +0100
From:   Roman Gushchin <guro@...com>
To:     <linux-mm@...ck.org>
CC:     Roman Gushchin <guro@...com>, Tejun Heo <tj@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Li Zefan <lizefan@...wei.com>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        <kernel-team@...com>, <cgroups@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH v2 3/7] mm, oom: export oom_evaluate_task() and select_bad_process()

Export the oom_evaluate_task() and select_bad_process()
functions to reuse them for victim selection logic
in the cgroup-aware OOM killer.

Signed-off-by: Roman Gushchin <guro@...com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Johannes Weiner <hannes@...xchg.org>
Cc: Li Zefan <lizefan@...wei.com>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Vladimir Davydov <vdavydov.dev@...il.com>
Cc: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: kernel-team@...com
Cc: cgroups@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org
---
 include/linux/oom.h | 3 +++
 mm/oom_kill.c       | 5 ++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/oom.h b/include/linux/oom.h
index 47d9495..edf7a77 100644
--- a/include/linux/oom.h
+++ b/include/linux/oom.h
@@ -80,6 +80,9 @@ extern void oom_killer_enable(void);
 extern struct task_struct *find_lock_task_mm(struct task_struct *p);
 
 extern void __oom_kill_process(struct task_struct *victim);
+extern int oom_evaluate_task(struct task_struct *task, void *arg);
+extern void select_bad_process(struct oom_control *oc,
+			       struct mem_cgroup *memcg);
 
 /* sysctls */
 extern int sysctl_oom_dump_tasks;
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 11b60a5..8cf77fb 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -288,7 +288,7 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc)
 	return CONSTRAINT_NONE;
 }
 
-static int oom_evaluate_task(struct task_struct *task, void *arg)
+int oom_evaluate_task(struct task_struct *task, void *arg)
 {
 	struct oom_control *oc = arg;
 	unsigned long points;
@@ -343,8 +343,7 @@ static int oom_evaluate_task(struct task_struct *task, void *arg)
  * Simple selection loop. We choose the process with the highest number of
  * 'points'. In case scan was aborted, oc->chosen is set to -1.
  */
-static void select_bad_process(struct oom_control *oc,
-			       struct mem_cgroup *memcg)
+void select_bad_process(struct oom_control *oc, struct mem_cgroup *memcg)
 {
 	if (memcg)
 		mem_cgroup_scan_tasks(memcg, oom_evaluate_task, oc);
-- 
2.7.4