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From: Mike Kravetz <mike.kravetz@oracle.com>
To: Mina Almasry <almasrymina@google.com>,
	rientjes@google.com, shakeelb@google.com
Cc: shuah@kernel.org, gthelen@google.com, akpm@linux-foundation.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org,
	aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [PATCH v10 3/8] hugetlb_cgroup: add reservation accounting for private mappings
Date: Fri, 17 Jan 2020 14:57:59 -0800	[thread overview]
Message-ID: <49e5872e-eecb-4279-bc79-bbc1e132ab5d@oracle.com> (raw)
In-Reply-To: <20200115012651.228058-3-almasrymina@google.com>

On 1/14/20 5:26 PM, Mina Almasry wrote:
> Normally the pointer to the cgroup to uncharge hangs off the struct
> page, and gets queried when it's time to free the page. With
> hugetlb_cgroup reservations, this is not possible. Because it's possible
> for a page to be reserved by one task and actually faulted in by another
> task.
> 
> The best place to put the hugetlb_cgroup pointer to uncharge for
> reservations is in the resv_map. But, because the resv_map has different
> semantics for private and shared mappings, the code patch to
> charge/uncharge shared and private mappings is different. This patch
> implements charging and uncharging for private mappings.
> 
> For private mappings, the counter to uncharge is in
> resv_map->reservation_counter. On initializing the resv_map this is set
> to NULL. On reservation of a region in private mapping, the tasks
> hugetlb_cgroup is charged and the hugetlb_cgroup is placed is
> resv_map->reservation_counter.
> 
> On hugetlb_vm_op_close, we uncharge resv_map->reservation_counter.
> 
> Signed-off-by: Mina Almasry <almasrymina@google.com>

Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>

-- 
Mike Kravetz

  reply	other threads:[~2020-01-17 22:58 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-15  1:26 [PATCH v10 1/8] hugetlb_cgroup: Add hugetlb_cgroup reservation counter Mina Almasry
2020-01-15  1:26 ` [PATCH v10 2/8] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations Mina Almasry
2020-01-17 19:26   ` Mike Kravetz
2020-01-17 19:34     ` Mina Almasry
2020-01-29 21:21   ` David Rientjes
2020-01-30  0:41     ` Mike Kravetz
2020-01-15  1:26 ` [PATCH v10 3/8] hugetlb_cgroup: add reservation accounting for private mappings Mina Almasry
2020-01-17 22:57   ` Mike Kravetz [this message]
2020-01-29 21:28   ` David Rientjes
2020-02-03 23:17     ` Mina Almasry
2020-01-15  1:26 ` [PATCH v10 4/8] hugetlb: disable region_add file_region coalescing Mina Almasry
2020-01-21 18:50   ` Mike Kravetz
2020-01-15  1:26 ` [PATCH v10 5/8] hugetlb_cgroup: add accounting for shared mappings Mina Almasry
2020-01-15  1:26 ` [PATCH v10 6/8] hugetlb_cgroup: support noreserve mappings Mina Almasry
2020-01-15  1:26 ` [PATCH v10 7/8] hugetlb_cgroup: Add hugetlb_cgroup reservation tests Mina Almasry
2020-01-23  9:15   ` Sandipan Das
2020-01-23 20:05     ` Mina Almasry
2020-01-29 21:00     ` David Rientjes
2020-01-30  6:11       ` Sandipan Das
2020-02-03 23:18         ` Mina Almasry
2020-01-15  1:26 ` [PATCH v10 8/8] hugetlb_cgroup: Add hugetlb_cgroup reservation docs Mina Almasry
2020-01-16 22:44 ` [PATCH v10 1/8] hugetlb_cgroup: Add hugetlb_cgroup reservation counter Mike Kravetz
2020-01-29 21:09 ` David Rientjes
2020-02-03 23:16   ` Mina Almasry

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