[PATCH 04/10] memcg: disable local interrupts in lock_page_cgroup()
kamezawa.hiroyu at jp.fujitsu.com
Wed Oct 6 17:35:45 PDT 2010
On Wed, 6 Oct 2010 09:15:34 +0900
Minchan Kim <minchan.kim at gmail.com> wrote:
> First of all, we could add your patch as it is and I don't expect any
> regression report about interrupt latency.
> That's because many embedded guys doesn't use mmotm and have a
> tendency to not report regression of VM.
> Even they don't use memcg. Hmm...
> I pass the decision to MAINTAINER Kame and Balbir.
> Thanks for the detail explanation.
Hmm. IRQ delay is a concern. So, my option is this. How do you think ?
1. remove local_irq_save()/restore() in lock/unlock_page_cgroup().
yes, I don't like it.
2. At moving charge, do this:
a) lock_page()/ or trylock_page()
c) do move_account under lock_page_cgroup().
Then, Writeback updates will never come from IRQ context while
lock/unlock_page_cgroup() is held by move_account(). There will be no race.
Do I miss something ?
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