linux-kernel - Re: [PATCH stable 4.6+] radix-tree: account nodes to memcg only if explicitly requested

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Message-ID: <20160803035139.GB31125@kroah.com>
Date:	Wed, 3 Aug 2016 05:51:39 +0200
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Vladimir Davydov <vdavydov@...tuozzo.com>
Cc:	stable@...r.kernel.org, Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH stable 4.6+] radix-tree: account nodes to memcg only if
 explicitly requested

On Tue, Aug 02, 2016 at 03:45:34PM +0300, Vladimir Davydov wrote:
> Radix trees may be used not only for storing page cache pages, so
> unconditionally accounting radix tree nodes to the current memory cgroup
> is bad: if a radix tree node is used for storing data shared among
> different cgroups we risk pinning dead memory cgroups forever. So let's
> only account radix tree nodes if it was explicitly requested by passing
> __GFP_ACCOUNT to INIT_RADIX_TREE. Currently, we only want to account
> page cache entries, so mark mapping->page_tree so.
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Acked-by: Michal Hocko <mhocko@...e.com>
> Cc: <stable@...r.kernel.org>  [4.6+]
> ---
>  fs/inode.c       |  2 +-
>  lib/radix-tree.c | 14 ++++++++++----
>  2 files changed, 11 insertions(+), 5 deletions(-)

Is this patch in Linus's tree already?

confused,

greg k-h