linux-kernel - Re: [PATCH] mm: account pmd page tables to the process

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Message-ID: <20150114182700.GG2253@moon>
Date:	Wed, 14 Jan 2015 21:27:00 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>, linux-mm@...ck.org,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: account pmd page tables to the process

On Wed, Jan 14, 2015 at 06:51:56PM +0200, Kirill A. Shutemov wrote:
> Dave noticed that unprivileged process can allocate significant amount
> of memory -- >500 MiB on x86_64 -- and stay unnoticed by oom-killer and
> memory cgroup. The trick is to allocate a lot of PMD page tables. Linux
> kernel doesn't account PMD tables to the process, only PTE.
> 
> The use-cases below use few tricks to allocate a lot of PMD page tables
> while keeping VmRSS and VmPTE low. oom_score for the process will be 0.

Reviewed-by: Cyrill Gorcunov <gorcunov@...nvz.org>
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