These 2 patches are updates for memcg's event counter.
Memcg has 2 counters but they counts the same thing. Just usages are
different from each other. This patch tries to combine them.
Event counting is done per page but event check is done per charge.
But, now, move_task at el. does charge() in batched manner. So, it's better
to do event check per page (not per charge.)
(*) There may be an opinion that threshold check should be done at charge().
But, at charge(), event counter is not incremented, anyway.
Then, some another idea is appreciated to check thresholds at charges.
In other view, checking threshold at "precharge" can cause miss-fire of
event notifier. So, checking threshold at commit has some sense, I think.
I wonder I should add RFC..but this patch clears my concerns since memcg-threshold
was merged. So, I didn't.
Any comment is welcome. (I'm sorry if my reply is delayed.)
Thanks,
-Kame
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