From: Alex Shi <alex.shi@linux.alibaba.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Joonsoo Kim <js1304@gmail.com>,
Shakeel Butt <shakeelb@google.com>,
Hugh Dickins <hughd@google.com>, Michal Hocko <mhocko@suse.com>,
"Kirill A. Shutemov" <kirill@shutemov.name>,
Roman Gushchin <guro@fb.com>,
linux-mm@kvack.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH 15/18] mm: memcontrol: make swap tracking an integral part of memory control
Date: Wed, 22 Apr 2020 21:40:28 +0800 [thread overview]
Message-ID: <66573da2-f863-bf6e-cc48-fb2540148d1d@linux.alibaba.com> (raw)
In-Reply-To: <20200422133001.GE358439@cmpxchg.org>
在 2020/4/22 下午9:30, Johannes Weiner 写道:
> On Wed, Apr 22, 2020 at 11:14:40AM +0800, Alex Shi wrote:
>>
>>
>> 在 2020/4/21 下午10:39, Johannes Weiner 写道:
>>> Hi Alex,
>>>
>>> thanks for your quick review so far, I'll add the tags to the patches.
>>>
>>> On Tue, Apr 21, 2020 at 05:27:30PM +0800, Alex Shi wrote:
>>>>
>>>>
>>>> 在 2020/4/21 上午6:11, Johannes Weiner 写道:
>>>>> The swapaccount=0 boot option will continue to exist, and it will
>>>>> eliminate the page_counter overhead and hide the swap control files,
>>>>> but it won't disable swap slot ownership tracking.
>>>>
>>>> May we add extra explanation for this change to user? and the default
>>>> memsw limitations?
>>>
>>> Can you elaborate what you think is missing and where you would like
>>> to see it documented?
>>>
>> Maybe the following doc change is better after whole patchset?
>> Guess users would would happy to know details of this change.
>
> Thanks, I stole your patch and extended/tweaked it a little. Would you
> mind providing your Signed-off-by:?
My pleasure. :)
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
>
> From 589d3c1b505e6671b4a9b424436c9eda88a0b08c Mon Sep 17 00:00:00 2001
> From: Alex Shi <alex.shi@linux.alibaba.com>
> Date: Wed, 22 Apr 2020 11:14:40 +0800
> Subject: [PATCH] mm: memcontrol: document the new swap control behavior
>
> Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
> ---
> .../admin-guide/cgroup-v1/memory.rst | 19 +++++++------------
> 1 file changed, 7 insertions(+), 12 deletions(-)
>
> diff --git a/Documentation/admin-guide/cgroup-v1/memory.rst b/Documentation/admin-guide/cgroup-v1/memory.rst
> index 0ae4f564c2d6..12757e63b26c 100644
> --- a/Documentation/admin-guide/cgroup-v1/memory.rst
> +++ b/Documentation/admin-guide/cgroup-v1/memory.rst
> @@ -199,11 +199,11 @@ An RSS page is unaccounted when it's fully unmapped. A PageCache page is
> unaccounted when it's removed from radix-tree. Even if RSS pages are fully
> unmapped (by kswapd), they may exist as SwapCache in the system until they
> are really freed. Such SwapCaches are also accounted.
> -A swapped-in page is not accounted until it's mapped.
> +A swapped-in page is accounted after adding into swapcache.
>
> Note: The kernel does swapin-readahead and reads multiple swaps at once.
> -This means swapped-in pages may contain pages for other tasks than a task
> -causing page fault. So, we avoid accounting at swap-in I/O.
> +Since page's memcg recorded into swap whatever memsw enabled, the page will
> +be accounted after swapin.
>
> At page migration, accounting information is kept.
>
> @@ -222,18 +222,13 @@ the cgroup that brought it in -- this will happen on memory pressure).
> But see section 8.2: when moving a task to another cgroup, its pages may
> be recharged to the new cgroup, if move_charge_at_immigrate has been chosen.
>
> -Exception: If CONFIG_MEMCG_SWAP is not used.
> -When you do swapoff and make swapped-out pages of shmem(tmpfs) to
> -be backed into memory in force, charges for pages are accounted against the
> -caller of swapoff rather than the users of shmem.
> -
> -2.4 Swap Extension (CONFIG_MEMCG_SWAP)
> +2.4 Swap Extension
> --------------------------------------
>
> -Swap Extension allows you to record charge for swap. A swapped-in page is
> -charged back to original page allocator if possible.
> +Swap usage is always recorded for each of cgroup. Swap Extension allows you to
> +read and limit it.
>
> -When swap is accounted, following files are added.
> +When CONFIG_SWAP is enabled, following files are added.
>
> - memory.memsw.usage_in_bytes.
> - memory.memsw.limit_in_bytes.
>
next prev parent reply other threads:[~2020-04-22 13:41 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 22:11 [PATCH 00/18] mm: memcontrol: charge swapin pages on instantiation Johannes Weiner
2020-04-20 22:11 ` [PATCH 01/18] mm: fix NUMA node file count error in replace_page_cache() Johannes Weiner
2020-04-21 8:28 ` Alex Shi
2020-04-21 19:13 ` Shakeel Butt
2020-04-22 6:34 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 02/18] mm: memcontrol: fix theoretical race in charge moving Johannes Weiner
2020-04-22 6:36 ` Joonsoo Kim
2020-04-22 16:51 ` Shakeel Butt
2020-04-22 17:42 ` Johannes Weiner
2020-04-22 18:01 ` Shakeel Butt
2020-04-22 18:02 ` Shakeel Butt
2020-04-20 22:11 ` [PATCH 03/18] mm: memcontrol: drop @compound parameter from memcg charging API Johannes Weiner
2020-04-21 9:11 ` Alex Shi
2020-04-22 6:37 ` Joonsoo Kim
2020-04-22 17:30 ` Shakeel Butt
2020-04-20 22:11 ` [PATCH 04/18] mm: memcontrol: move out cgroup swaprate throttling Johannes Weiner
2020-04-21 9:11 ` Alex Shi
2020-04-22 6:37 ` Joonsoo Kim
2020-04-22 22:20 ` Shakeel Butt
2020-04-20 22:11 ` [PATCH 05/18] mm: memcontrol: convert page cache to a new mem_cgroup_charge() API Johannes Weiner
2020-04-21 9:12 ` Alex Shi
2020-04-22 6:40 ` Joonsoo Kim
2020-04-22 12:09 ` Johannes Weiner
2020-04-23 5:25 ` Joonsoo Kim
2020-05-08 16:01 ` Johannes Weiner
2020-05-11 1:57 ` Joonsoo Kim
2020-05-11 7:38 ` Hugh Dickins
2020-05-11 15:06 ` Johannes Weiner
2020-05-11 16:32 ` Hugh Dickins
2020-05-11 18:10 ` Johannes Weiner
2020-05-11 18:12 ` Johannes Weiner
2020-05-11 18:44 ` Hugh Dickins
2020-04-20 22:11 ` [PATCH 06/18] mm: memcontrol: prepare uncharging for removal of private page type counters Johannes Weiner
2020-04-21 9:12 ` Alex Shi
2020-04-22 6:41 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 07/18] mm: memcontrol: prepare move_account " Johannes Weiner
2020-04-21 9:13 ` Alex Shi
2020-04-22 6:41 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 08/18] mm: memcontrol: prepare cgroup vmstat infrastructure for native anon counters Johannes Weiner
2020-04-22 6:42 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 09/18] mm: memcontrol: switch to native NR_FILE_PAGES and NR_SHMEM counters Johannes Weiner
2020-04-22 6:42 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 10/18] mm: memcontrol: switch to native NR_ANON_MAPPED counter Johannes Weiner
2020-04-22 6:51 ` Joonsoo Kim
2020-04-22 12:28 ` Johannes Weiner
2020-04-23 5:27 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 11/18] mm: memcontrol: switch to native NR_ANON_THPS counter Johannes Weiner
2020-04-24 0:29 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 12/18] mm: memcontrol: convert anon and file-thp to new mem_cgroup_charge() API Johannes Weiner
2020-04-24 0:29 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 13/18] mm: memcontrol: drop unused try/commit/cancel charge API Johannes Weiner
2020-04-24 0:30 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 14/18] mm: memcontrol: prepare swap controller setup for integration Johannes Weiner
2020-04-24 0:30 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 15/18] mm: memcontrol: make swap tracking an integral part of memory control Johannes Weiner
2020-04-21 9:27 ` Alex Shi
2020-04-21 14:39 ` Johannes Weiner
2020-04-22 3:14 ` Alex Shi
2020-04-22 13:30 ` Johannes Weiner
2020-04-22 13:40 ` Alex Shi [this message]
2020-04-22 13:43 ` Alex Shi
2020-04-24 0:30 ` Joonsoo Kim
2020-04-24 3:01 ` Johannes Weiner
2020-04-20 22:11 ` [PATCH 16/18] mm: memcontrol: charge swapin pages on instantiation Johannes Weiner
2020-04-21 9:21 ` Alex Shi
2020-04-24 0:44 ` Joonsoo Kim
2020-04-24 2:51 ` Johannes Weiner
2020-04-28 6:49 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 17/18] mm: memcontrol: delete unused lrucare handling Johannes Weiner
2020-04-24 0:46 ` Joonsoo Kim
2020-04-20 22:11 ` [PATCH 18/18] mm: memcontrol: update page->mem_cgroup stability rules Johannes Weiner
2020-04-21 9:20 ` Alex Shi
2020-04-24 0:48 ` Joonsoo Kim
2020-04-21 9:10 ` Hillf Danton
2020-04-21 14:34 ` Johannes Weiner
2020-04-21 9:32 ` [PATCH 00/18] mm: memcontrol: charge swapin pages on instantiation Alex Shi
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