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Re: [PATCH 0/5] memcg/kmem: switch to white list policy

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On Mon, Nov 09, 2015 at 03:08:32PM +0100, Michal Hocko wrote:
> I am _all_ for this semantic I am just not sure what to do with the
> legacy kmem controller. Can we change its semantic? If we cannot do that
> we would have to distinguish legacy and unified hierarchies during
> runtime and add the flag automagically for the first one (that would
> however require to keep __GFP_NOACCOUNT as well) which is all as clear
> as mud. But maybe the workloads which are using kmem legacy API can cope
> with that.

I think we can make that change for the existing kmem accounting too,
simply because the whitelist should be covering all memory consumers
that actually matter for isolation in practice. Yes, there is a risk
for accidents, but we are not actually intending to change semantics.

> Anyway if we go this way then I think the kmem accounting would be safe
> to be enabled by default with the cgroup2.

Cool, I'm happy we're on the same page about this.
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[PATCH 0/5] memcg/kmem: switch to white list policy Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-07 21:10 +0100
  [PATCH 4/5] vmalloc: allow to account vmalloc to memcg Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-07 21:10 +0100
  [PATCH 3/5] memcg: only account kmem allocations marked as __GFP_ACCOUNT Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-07 21:10 +0100
  [PATCH 1/5] Revert "kernfs: do not account ino_ida allocations to memcg" Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-07 21:10 +0100
  Re: [PATCH 0/5] memcg/kmem: switch to white list policy Michal Hocko <mhocko@kernel.org> - 2015-11-09 15:10 +0100
    Re: [PATCH 0/5] memcg/kmem: switch to white list policy Johannes Weiner <hannes@cmpxchg.org> - 2015-11-09 17:50 +0100
    Re: [PATCH 0/5] memcg/kmem: switch to white list policy Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-09 19:30 +0100
      Re: [PATCH 0/5] memcg/kmem: switch to white list policy Tejun Heo <tj@kernel.org> - 2015-11-09 20:00 +0100
        Re: [PATCH 0/5] memcg/kmem: switch to white list policy Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-09 20:30 +0100
          Re: [PATCH 0/5] memcg/kmem: switch to white list policy Tejun Heo <tj@kernel.org> - 2015-11-09 20:40 +0100
            Re: [PATCH 0/5] memcg/kmem: switch to white list policy Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-09 21:20 +0100
              Re: [PATCH 0/5] memcg/kmem: switch to white list policy Tejun Heo <tj@kernel.org> - 2015-11-09 21:40 +0100
                Re: [PATCH 0/5] memcg/kmem: switch to white list policy Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-10 09:00 +0100
      Re: [PATCH 0/5] memcg/kmem: switch to white list policy Michal Hocko <mhocko@kernel.org> - 2015-11-11 09:20 +0100
  Re: [PATCH 5/5] Account certain kmem allocations to memcg Michal Hocko <mhocko@kernel.org> - 2015-11-09 15:50 +0100
    Re: [PATCH 5/5] Account certain kmem allocations to memcg Vladimir Davydov <vdavydov@virtuozzo.com> - 2015-11-10 09:10 +0100
      Re: [PATCH 5/5] Account certain kmem allocations to memcg Michal Hocko <mhocko@kernel.org> - 2015-11-10 14:30 +0100

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