| Date | Sun, 01 Jul 2012 11:33:17 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 20/40] autonuma: alloc/free/init mm_autonuma |
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On 06/28/2012 08:56 AM, Andrea Arcangeli wrote:
> diff --git a/kernel/fork.c b/kernel/fork.c > index 0adbe09..3e5a0d9 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -527,6 +527,8 @@ static void mm_init_aio(struct mm_struct *mm) > > static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p) > { > + if (unlikely(alloc_mm_autonuma(mm))) > + goto out_free_mm; > atomic_set(&mm->mm_users, 1); > atomic_set(&mm->mm_count, 1); > init_rwsem(&mm->mmap_sem);
I wonder if it would be possible to defer the allocation of the mm_autonuma struct to knuma_scand, so short lived processes never have to allocate and free the mm_autonuma structure.
That way we only have a function call at exit time, and the branch inside kfree that checks for a null pointer.
-- All rights reversed
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