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Re: [PATCH v2 1/2] mm: Uncharge poisoned pages

From Balbir Singh <bsingharora@gmail.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2 1/2] mm: Uncharge poisoned pages
Date 2017-04-26 05:50 +0200
Message-ID <tAm7L-5dT-3@gated-at.bofh.it> (permalink)
References <tA9Dz-5OC-1@gated-at.bofh.it> <tA9DA-5OC-25@gated-at.bofh.it> <tAkpj-43b-5@gated-at.bofh.it> <tAlEJ-54X-5@gated-at.bofh.it>
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> > >  static int delete_from_lru_cache(struct page *p)
> > >  {
> > > +	if (memcg_kmem_enabled())
> > > +		memcg_kmem_uncharge(p, 0);
> > > +
> > 
> > The changelog is not quite clear, so we are uncharging a page using
> > memcg_kmem_uncharge for a page in swap cache/page cache?
> 
> Hi Balbir,
> 
> Yes, in the normal page lifecycle, uncharge is done in page free time.
> But in memory error handling case, in-use pages (i.e. swap cache and page
> cache) are removed from normal path and they don't pass page freeing code.
> So I think that this change is to keep the consistent charging for such a case.

I agree we should uncharge, but looking at the API name, it seems to
be for kmem pages, why are we not using mem_cgroup_uncharge()? Am I missing
something?

Balbir Singh.

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Thread

[PATCH v2 0/2] BUG raised when onlining HWPoisoned page Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-25 16:30 +0200
  [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-25 16:30 +0200
    Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Balbir Singh <bsingharora@gmail.com> - 2017-04-26 04:20 +0200
      Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-04-26 05:30 +0200
        Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Balbir Singh <bsingharora@gmail.com> - 2017-04-28 05:00 +0200
        Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Michal Hocko <mhocko@kernel.org> - 2017-04-28 08:40 +0200
          Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Michal Hocko <mhocko@kernel.org> - 2017-04-28 09:00 +0200
            Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Michal Hocko <mhocko@kernel.org> - 2017-05-10 09:50 +0200
          Re: [PATCH v2 2/2] mm: skip HWPoisoned pages when onlining pages Michal Hocko <mhocko@kernel.org> - 2017-04-28 09:00 +0200
  [PATCH v2 1/2] mm: Uncharge poisoned pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-25 16:30 +0200
    Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-04-26 02:00 +0200
    Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Balbir Singh <bsingharora@gmail.com> - 2017-04-26 04:00 +0200
      Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-04-26 05:20 +0200
        Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Balbir Singh <bsingharora@gmail.com> - 2017-04-26 05:50 +0200
          Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-04-26 06:50 +0200
            Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Balbir Singh <bsingharora@gmail.com> - 2017-04-26 11:10 +0200
              Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-28 11:40 +0200
    Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Michal Hocko <mhocko@kernel.org> - 2017-04-27 16:40 +0200
      Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Andi Kleen <andi@firstfloor.org> - 2017-04-27 23:00 +0200
        Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Michal Hocko <mhocko@kernel.org> - 2017-04-28 08:10 +0200
          Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Michal Hocko <mhocko@kernel.org> - 2017-04-28 09:40 +0200
            Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-04-28 11:20 +0200
              Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Michal Hocko <mhocko@kernel.org> - 2017-04-28 15:50 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-02 17:00 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Michal Hocko <mhocko@kernel.org> - 2017-05-02 21:00 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-03 13:40 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Balbir Singh <bsingharora@gmail.com> - 2017-05-04 03:30 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Laurent Dufour <ldufour@linux.vnet.ibm.com> - 2017-05-08 12:50 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Balbir Singh <bsingharora@gmail.com> - 2017-05-09 03:50 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-05-08 05:10 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Michal Hocko <mhocko@kernel.org> - 2017-05-09 11:20 +0200
                Re: [PATCH v2 1/2] mm: Uncharge poisoned pages Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> - 2017-05-10 01:10 +0200

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