linux-kernel - Re: [PATCH -V8 14/16] hugetlb/cgroup: add charge/uncharge calls for HugeTLB alloc/free

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Message-ID: <20120609092301.GF1761@cmpxchg.org>
Date:	Sat, 9 Jun 2012 11:23:01 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
	dhillf@...il.com, rientjes@...gle.com, mhocko@...e.cz,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V8 14/16] hugetlb/cgroup: add charge/uncharge calls for
 HugeTLB alloc/free

On Sat, Jun 09, 2012 at 02:29:59PM +0530, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> 
> This adds necessary charge/uncharge calls in the HugeTLB code.  We do
> hugetlb cgroup charge in page alloc and uncharge in compound page destructor.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
>  mm/hugetlb.c        |   16 +++++++++++++++-
>  mm/hugetlb_cgroup.c |    7 +------
>  2 files changed, 16 insertions(+), 7 deletions(-)
> 
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index bf79131..4ca92a9 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -628,6 +628,8 @@ static void free_huge_page(struct page *page)
>  	BUG_ON(page_mapcount(page));
>  
>  	spin_lock(&hugetlb_lock);
> +	hugetlb_cgroup_uncharge_page(hstate_index(h),
> +				     pages_per_huge_page(h), page);

hugetlb_cgroup_uncharge_page() takes the hugetlb_lock, no?

It's quite hard to review code that is split up like this.  Please
always keep the introduction of new functions in the same patch that
adds the callsite(s).
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