linux-kernel - Re: [PATCH] uprobes: Add mem_cgroup_charge_anon() into uprobe_write

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Message-ID: <20140521100506.GC29630@linux.vnet.ibm.com>
Date:	Wed, 21 May 2014 15:35:06 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	David Long <dave.long@...aro.org>,
	Hugh Dickins <hughd@...gle.com>, Michal Hocko <mhocko@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uprobes: Add mem_cgroup_charge_anon() into
 uprobe_write_opcode()

* Oleg Nesterov <oleg@...hat.com> [2014-05-05 17:13:20]:

> Hugh says:
> 
>     The one I noticed was that it forgets all about memcg (because
>     it was copied from KSM, and there the replacement page has already
>     been charged to a memcg). See how mm/memory.c do_anonymous_page()
>     does a mem_cgroup_charge_anon().
> 
> Hopefully not a big problem, uprobes is a system-wide thing and only
> root can insert the probes. But I agree, should be fixed anyway.
> 
> Add mem_cgroup_{un,}charge_anon() into uprobe_write_opcode(). To simplify
> the error handling (and avoid the new "uncharge" label) the patch also
> moves anon_vma_prepare() up before we alloc/charge the new page.
> 
> While at it fix the comment about ->mmap_sem, it is held for write.
> 
> Suggested-by: Hugh Dickins <hughd@...gle.com>
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Acked-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

-- 
Thanks and Regards
Srikar Dronamraju

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