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From: Richard Palethorpe <rpalethorpe@suse.de>
To: Roman Gushchin <guro@fb.com>
Cc: "Michal Koutný" <mkoutny@suse.com>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	ltp@lists.linux.it, "Andrew Morton" <akpm@linux-foundation.org>,
	"Shakeel Butt" <shakeelb@google.com>,
	"Christoph Lameter" <cl@linux.com>,
	"Michal Hocko" <mhocko@kernel.org>, "Tejun Heo" <tj@kernel.org>,
	"Vlastimil Babka" <vbabka@suse.cz>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	"Michal Hocko" <mhocko@suse.com>
Subject: Re: [RFC PATCH] mm: memcg/slab: Stop reparented obj_cgroups from charging root
Date: Tue, 20 Oct 2020 13:02:35 +0100	[thread overview]
Message-ID: <87h7qpw1es.fsf@suse.de> (raw)
In-Reply-To: <87k0vlwhzt.fsf@suse.de>

Hello,

Richard Palethorpe <rpalethorpe@suse.de> writes:

> Hello Roman,
>
> Roman Gushchin <guro@fb.com> writes:
>
>> -		page_counter_init(&memcg->memory, NULL);
>> -		page_counter_init(&memcg->swap, NULL);
>> -		page_counter_init(&memcg->kmem, NULL);
>> -		page_counter_init(&memcg->tcpmem, NULL);
>> +		/*
>> +		 * If use_hierarchy == false, consider all page counters direct
>> +		 * descendants of the corresponding root level counters.
>> +		 */
>> +		page_counter_init(&memcg->memory, &root_mem_cgroup->memory);
>> +		page_counter_init(&memcg->swap, &root_mem_cgroup->swap);
>> +		page_counter_init(&memcg->kmem, &root_mem_cgroup->kmem);
>> +		page_counter_init(&memcg->tcpmem, &root_mem_cgroup->tcpmem);
>> +
>>  		/*
>>  		 * Deeper hierachy with use_hierarchy == false doesn't make
>>  		 * much sense so let cgroup subsystem know about this
>
> Perhaps in this case, where the hierarchy is broken, objcgs should also
> be reparented directly to root? Otherwise it will still be possible to
> underflow the counter in a descendant of root which has use_hierarchy=0,
> but also has children.

Sorry ignore me, parent_mem_cgroup already selects root. So in the case
of a broken hierarchy objcgs are reparented directly to root.

-- 
Thank you,
Richard.


  reply	other threads:[~2020-10-20 12:02 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-14 19:07 Richard Palethorpe
2020-10-14 20:08 ` Roman Gushchin
2020-10-16  5:40   ` Richard Palethorpe
2020-10-16  9:47 ` Michal Koutný
2020-10-16 10:41   ` Richard Palethorpe
2020-10-16 15:05     ` Richard Palethorpe
2020-10-16 17:26       ` Michal Koutný
2020-10-16 14:53   ` Johannes Weiner
2020-10-16 17:02     ` Roman Gushchin
2020-10-16 17:15     ` Michal Koutný
2020-10-19  8:45       ` Richard Palethorpe
2020-10-19  9:58         ` [PATCH v3] " Richard Palethorpe
2020-10-19 16:58           ` Shakeel Butt
2020-10-20  5:52             ` Richard Palethorpe
2020-10-20 13:49               ` Richard Palethorpe
2020-10-20 16:56                 ` Shakeel Butt
2020-10-21 20:32                   ` Roman Gushchin
2020-10-20 17:24               ` Michal Koutný
2020-10-22  7:04                 ` Richard Palethorpe
2020-10-22 12:28                   ` [PATCH v4] " Richard Palethorpe
2020-10-22 16:37                     ` Shakeel Butt
2020-10-22 17:25                       ` Roman Gushchin
2020-10-22 23:59                         ` Shakeel Butt
2020-10-23  0:40                           ` Roman Gushchin
2020-10-23 15:44                             ` Johannes Weiner
2020-10-23 16:41                             ` Shakeel Butt
2020-10-26  7:32                             ` Richard Palethorpe
2020-10-26 23:14                               ` Roman Gushchin
2020-10-19 22:28       ` [RFC PATCH] " Roman Gushchin
2020-10-20  6:04         ` Richard Palethorpe
2020-10-20 12:02           ` Richard Palethorpe [this message]
2020-10-20 14:48         ` Richard Palethorpe
2020-10-20 16:27         ` Michal Koutný
2020-10-20 17:07           ` Roman Gushchin
2020-10-20 18:18             ` Johannes Weiner
2020-10-21 19:33               ` Roman Gushchin
2020-10-23 16:30                 ` Johannes Weiner
2020-11-10  1:27                   ` Roman Gushchin
2020-11-10 15:11                     ` Shakeel Butt
2020-11-10 19:13                       ` Roman Gushchin
2020-11-20 17:46                       ` Michal Koutný
2020-11-03 13:22                 ` Michal Hocko
2020-11-03 21:30                   ` Roman Gushchin
2020-10-20 16:55         ` Shakeel Butt
2020-10-20 17:17           ` Roman Gushchin

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