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Re: [PATCH v2 09/11] memcg: propagate kmem limiting information to children [message #47593 is a reply to message #47592] Fri, 17 August 2012 10:07 Go to previous messageGo to previous message
Glauber Costa is currently offline  Glauber Costa
Messages: 916
Registered: October 2011
Senior Member
On 08/17/2012 01:35 PM, Michal Hocko wrote:
>>> Above you said "Once enabled, can't be disabled." and now you can
>>> > > disable it? Say you are a leaf group with non accounted parents. This
>>> > > will clear the flag and so no further accounting is done. Shouldn't
>>> > > unlimited mean that we will never reach the limit? Or am I missing
>>> > > something?
>>> > >
>> >
>> > You are missing something, and maybe I should be more clear about that.
>> > The static branches can't be disabled (it is only safe to disable them
>> > from disarm_static_branches(), when all references are gone). Note that
>> > when unlimited, we flip bits, do a transversal, but there is no mention
>> > to the static branch.
> My little brain still doesn't get this. I wasn't concerned about static
> branches. I was worried about memcg_can_account_kmem which will return
> false now, doesn't it.
>

Yes, it will. If I got you right, you are concerned because I said that
can't happen. But it will.

But I never said that can't happen. I said (ok, I meant) the static
branches can't be disabled.
 
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