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| author | Corey Minyard <cminyard@mvista.com> | 2017-11-02 11:19:15 -0500 |
|---|---|---|
| committer | Corey Minyard <cminyard@mvista.com> | 2017-11-02 11:19:15 -0500 |
| commit | 6297fabd93f93182245383ba7de56bef829a796b (patch) | |
| tree | 804f5d28ada61b402d56281c9a047308d26347f4 /mm/oom_kill.c | |
| parent | d7e17fe4f7a7d961cc4375c7d868bd353a039bc7 (diff) | |
| parent | ece1996a21eeb344b49200e627c6660111009c10 (diff) | |
| download | linux-6297fabd93f93182245383ba7de56bef829a796b.tar.gz linux-6297fabd93f93182245383ba7de56bef829a796b.tar.xz | |
Merge branch 'modules-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jeyu/linux into for-next
The IPMI SI driver was split into different pieces, merge the module
tree to accountfor that.
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Diffstat (limited to 'mm/oom_kill.c')
| -rw-r--r-- | mm/oom_kill.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 99736e026712..dee0f75c3013 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -40,6 +40,7 @@ #include <linux/ratelimit.h> #include <linux/kthread.h> #include <linux/init.h> +#include <linux/mmu_notifier.h> #include <asm/tlb.h> #include "internal.h" @@ -495,6 +496,21 @@ static bool __oom_reap_task_mm(struct task_struct *tsk, struct mm_struct *mm) } /* + * If the mm has notifiers then we would need to invalidate them around + * unmap_page_range and that is risky because notifiers can sleep and + * what they do is basically undeterministic. So let's have a short + * sleep to give the oom victim some more time. + * TODO: we really want to get rid of this ugly hack and make sure that + * notifiers cannot block for unbounded amount of time and add + * mmu_notifier_invalidate_range_{start,end} around unmap_page_range + */ + if (mm_has_notifiers(mm)) { + up_read(&mm->mmap_sem); + schedule_timeout_idle(HZ); + goto unlock_oom; + } + + /* * MMF_OOM_SKIP is set by exit_mmap when the OOM reaper can't * work on the mm anymore. The check for MMF_OOM_SKIP must run * under mmap_sem for reading because it serializes against the |