From 7887a3da753e1ba8244556cc9a2b38c815bfe256 Mon Sep 17 00:00:00 2001 From: Nick Piggin <npiggin@suse.de> Date: Mon, 25 Sep 2006 23:31:29 -0700 Subject: [PATCH] [PATCH] oom: cpuset hint cpuset_excl_nodes_overlap does not always indicate that killing a task will not free any memory we for us. For example, we may be asking for an allocation from _anywhere_ in the machine, or the task in question may be pinning memory that is outside its cpuset. Fix this by just causing cpuset_excl_nodes_overlap to reduce the badness rather than disallow it. Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org> --- mm/oom_kill.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 7d056843fa2db..4f815b06ac1b6 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -128,6 +128,14 @@ unsigned long badness(struct task_struct *p, unsigned long uptime) if (cap_t(p->cap_effective) & CAP_TO_MASK(CAP_SYS_RAWIO)) points /= 4; + /* + * If p's nodes don't overlap ours, it may still help to kill p + * because p may have allocated or otherwise mapped memory on + * this node before. However it will be less likely. + */ + if (!cpuset_excl_nodes_overlap(p)) + points /= 8; + /* * Adjust the score by oomkilladj. */ @@ -198,9 +206,6 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) continue; if (p->oomkilladj == OOM_DISABLE) continue; - /* If p's nodes don't overlap ours, it won't help to kill p. */ - if (!cpuset_excl_nodes_overlap(p)) - continue; /* * This is in the process of releasing memory so wait for it -- GitLab