Re: [PATCH v5 06/14] memcg: kmem controller infrastructure
From: David Rientjes
Date: Thu Oct 18 2012 - 18:06:57 EST
On Thu, 18 Oct 2012, Glauber Costa wrote:
> > Do we actually need to test PF_KTHREAD when current->mm == NULL?
> > Perhaps because of aio threads whcih temporarily adopt a userspace mm?
> I believe so. I remember I discussed this in the past with David
> Rientjes and he advised me to test for both.
PF_KTHREAD can do use_mm() to assume an ->mm but hopefully they aren't
allocating slab while doing so. Have you considered actually charging
current->mm->owner for that memory, though, since the kthread will have
freed the memory before unuse_mm() or otherwise have charged it on behalf
of a user process, i.e. only exempting PF_KTHREAD?
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/