On Thu, 4 Sep 2014, Oleg Nesterov wrote:
> On 09/04, Peter Zijlstra wrote:
> > On Wed, Sep 03, 2014 at 06:08:19PM +0200, Oleg Nesterov wrote:
> >
> > > And a stupid (really, I don't understand this code) question:
> > >
> > > /* for example, ksmd faulting in a user's mm */
> > > if (!p->mm)
> > > return;
I don't understand your difficulty with that, I thought the comment
was helpful enough. Does the original commit comment help?
commit 2832bc19f6668fd00116f61f821105040599ef8b
Author: Hugh Dickins <hu...@google.com>
Date: Wed Dec 19 17:42:16 2012 -0800
sched: numa: ksm: fix oops in task_numa_placment()
task_numa_placement() oopsed on NULL p->mm when task_numa_fault() got
called in the handling of break_ksm() for ksmd. That might be a
peculiar case, which perhaps KSM could takes steps to avoid? but it's
more robust if task_numa_placement() allows for such a possibility.
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