Re: [PATCH 1/6] pagemap: avoid splitting thp when reading /proc/pid/pagemap

[Naoya Horiguchi]

On Sun, Jan 29, 2012 at 09:17:32PM +0800, Hillf Danton wrote:
> Hi Naoya
> 
> On Sat, Jan 28, 2012 at 7:02 AM, Naoya Horiguchi
> <n-horiguchi@xxxxxxxxxxxxx> wrote:
> > Thp split is not necessary if we explicitly check whether pmds are
> > mapping thps or not. This patch introduces this check and adds code
> > to generate pagemap entries for pmds mapping thps, which results in
> > less performance impact of pagemap on thp.
> >
> 
> Could the method proposed here cover the two cases of split THP in mem cgroup?

No for now, but yes if "move charge" function supports THP.
I think this can be a bit large step so it is the next work.

Thanks,
Naoya
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