From 16e951966f05da5ccd650104176f6ba289f7fa20 Mon Sep 17 00:00:00 2001 From: Johannes Weiner Date: Wed, 24 Jun 2015 16:57:07 -0700 Subject: mm: oom_kill: clean up victim marking and exiting interfaces Rename unmark_oom_victim() to exit_oom_victim(). Marking and unmarking are related in functionality, but the interface is not symmetrical at all: one is an internal OOM killer function used during the killing, the other is for an OOM victim to signal its own death on exit later on. This has locking implications, see follow-up changes. While at it, rename mark_tsk_oom_victim() to mark_oom_victim(), which is easier on the eye. Signed-off-by: Johannes Weiner Acked-by: David Rientjes Acked-by: Michal Hocko Cc: Tetsuo Handa Cc: Andrea Arcangeli Cc: Dave Chinner Cc: Vlastimil Babka Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 2 +- mm/oom_kill.c | 16 +++++++--------- 2 files changed, 8 insertions(+), 10 deletions(-) (limited to 'mm') diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a04225d..20a7e87 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1536,7 +1536,7 @@ static void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, * quickly exit and free its memory. */ if (fatal_signal_pending(current) || task_will_free_mem(current)) { - mark_tsk_oom_victim(current); + mark_oom_victim(current); return; } diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 73763e4..b2f081f 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -408,13 +408,13 @@ bool oom_killer_disabled __read_mostly; static DECLARE_RWSEM(oom_sem); /** - * mark_tsk_oom_victim - marks the given task as OOM victim. + * mark_oom_victim - mark the given task as OOM victim * @tsk: task to mark * * Has to be called with oom_sem taken for read and never after * oom has been disabled already. */ -void mark_tsk_oom_victim(struct task_struct *tsk) +void mark_oom_victim(struct task_struct *tsk) { WARN_ON(oom_killer_disabled); /* OOM killer might race with memcg OOM */ @@ -431,11 +431,9 @@ void mark_tsk_oom_victim(struct task_struct *tsk) } /** - * unmark_oom_victim - unmarks the current task as OOM victim. - * - * Wakes up all waiters in oom_killer_disable() + * exit_oom_victim - note the exit of an OOM victim */ -void unmark_oom_victim(void) +void exit_oom_victim(void) { if (!test_and_clear_thread_flag(TIF_MEMDIE)) return; @@ -515,7 +513,7 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, */ task_lock(p); if (p->mm && task_will_free_mem(p)) { - mark_tsk_oom_victim(p); + mark_oom_victim(p); task_unlock(p); put_task_struct(p); return; @@ -570,7 +568,7 @@ void oom_kill_process(struct task_struct *p, gfp_t gfp_mask, int order, /* mm cannot safely be dereferenced after task_unlock(victim) */ mm = victim->mm; - mark_tsk_oom_victim(victim); + mark_oom_victim(victim); pr_err("Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB\n", task_pid_nr(victim), victim->comm, K(victim->mm->total_vm), K(get_mm_counter(victim->mm, MM_ANONPAGES)), @@ -728,7 +726,7 @@ static void __out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, */ if (current->mm && (fatal_signal_pending(current) || task_will_free_mem(current))) { - mark_tsk_oom_victim(current); + mark_oom_victim(current); return; } -- cgit v1.1