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From: Matthew Wilcox <willy@infradead.org>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: viro@zeniv.linux.org.uk, hannes@cmpxchg.org, mhocko@kernel.org,
	vdavydov.dev@gmail.com, akpm@linux-foundation.org,
	tglx@linutronix.de, pombredanne@nexb.com,
	stummala@codeaurora.org, gregkh@linuxfoundation.org,
	sfr@canb.auug.org.au, guro@fb.com, mka@chromium.org,
	penguin-kernel@I-love.SAKURA.ne.jp, chris@chris-wilson.co.uk,
	longman@redhat.com, minchan@kernel.org, hillf.zj@alibaba-inc.com,
	ying.huang@intel.com, mgorman@techsingularity.net,
	shakeelb@google.com, jbacik@fb.com, linux@roeck-us.net,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 03/10] mm: Assign memcg-aware shrinkers bitmap to memcg
Date: Wed, 21 Mar 2018 07:56:25 -0700	[thread overview]
Message-ID: <20180321145625.GA4780@bombadil.infradead.org> (raw)
In-Reply-To: <152163850081.21546.6969747084834474733.stgit@localhost.localdomain>

On Wed, Mar 21, 2018 at 04:21:40PM +0300, Kirill Tkhai wrote:
> +++ b/include/linux/memcontrol.h
> @@ -151,6 +151,11 @@ struct mem_cgroup_thresholds {
>  	struct mem_cgroup_threshold_ary *spare;
>  };
>  
> +struct shrinkers_map {
> +	struct rcu_head rcu;
> +	unsigned long *map[0];
> +};
> +
>  enum memcg_kmem_state {
>  	KMEM_NONE,
>  	KMEM_ALLOCATED,
> @@ -182,6 +187,9 @@ struct mem_cgroup {
>  	unsigned long low;
>  	unsigned long high;
>  
> +	/* Bitmap of shrinker ids suitable to call for this memcg */
> +	struct shrinkers_map __rcu *shrinkers_map;
> +
>  	/* Range enforcement for interrupt charges */
>  	struct work_struct high_work;
>  

Why use your own bitmap here?  Why not use an IDA which can grow and
shrink automatically without you needing to play fun games with RCU?

  reply	other threads:[~2018-03-21 14:56 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-21 13:21 [PATCH 00/10] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n)) Kirill Tkhai
2018-03-21 13:21 ` [PATCH 01/10] mm: Assign id to every memcg-aware shrinker Kirill Tkhai
2018-03-24 18:40   ` Vladimir Davydov
2018-03-26 15:09     ` Kirill Tkhai
2018-03-26 15:14       ` Matthew Wilcox
2018-03-26 15:38         ` Kirill Tkhai
2018-03-27  9:15       ` Vladimir Davydov
2018-03-27 15:09         ` Kirill Tkhai
2018-03-27 15:48           ` Vladimir Davydov
2018-03-28 10:30             ` Kirill Tkhai
2018-03-28 11:02               ` Vladimir Davydov
2018-03-21 13:21 ` [PATCH 02/10] mm: Maintain memcg-aware shrinkers in mcg_shrinkers array Kirill Tkhai
2018-03-24 18:45   ` Vladimir Davydov
2018-03-26 15:20     ` Kirill Tkhai
2018-03-26 15:34       ` Matthew Wilcox
2018-03-27  9:18       ` Vladimir Davydov
2018-03-27 15:30         ` Kirill Tkhai
2018-03-21 13:21 ` [PATCH 03/10] mm: Assign memcg-aware shrinkers bitmap to memcg Kirill Tkhai
2018-03-21 14:56   ` Matthew Wilcox [this message]
2018-03-21 15:12     ` Kirill Tkhai
2018-03-21 15:26       ` Matthew Wilcox
2018-03-21 15:43         ` Kirill Tkhai
2018-03-21 16:20           ` Matthew Wilcox
2018-03-21 16:42             ` Kirill Tkhai
2018-03-21 17:54               ` Matthew Wilcox
2018-03-22 16:39                 ` Kirill Tkhai
2018-03-23  9:06   ` kbuild test robot
2018-03-23  9:06     ` kbuild test robot
2018-03-23 11:26     ` Kirill Tkhai
2018-03-24 19:25   ` Vladimir Davydov
2018-03-26 15:29     ` Kirill Tkhai
2018-03-27 10:00       ` Vladimir Davydov
2018-03-27 15:17         ` Kirill Tkhai
2018-03-21 13:21 ` [PATCH 04/10] fs: Propagate shrinker::id to list_lru Kirill Tkhai
2018-03-24 18:50   ` Vladimir Davydov
2018-03-26 15:29     ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 05/10] list_lru: Add memcg argument to list_lru_from_kmem() Kirill Tkhai
2018-04-02  3:17   ` [lkp-robot] [list_lru] 42658d54ce: BUG:unable_to_handle_kernel kernel test robot
2018-04-02  3:17     ` kernel test robot
2018-04-02  3:17     ` kernel test robot
2018-04-02  8:51     ` Kirill Tkhai
2018-04-02  8:51       ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 06/10] list_lru: Pass dst_memcg argument to memcg_drain_list_lru_node() Kirill Tkhai
2018-03-24 19:32   ` Vladimir Davydov
2018-03-26 15:30     ` Kirill Tkhai
2018-03-28 14:49       ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 07/10] list_lru: Pass lru " Kirill Tkhai
2018-03-21 13:22 ` [PATCH 08/10] mm: Set bit in memcg shrinker bitmap on first list_lru item apearance Kirill Tkhai
2018-03-24 19:45   ` Vladimir Davydov
2018-03-26 15:31     ` Kirill Tkhai
2018-03-21 13:22 ` [PATCH 09/10] mm: Iterate only over charged shrinkers during memcg shrink_slab() Kirill Tkhai
2018-03-24 20:11   ` Vladimir Davydov
2018-03-26 15:33     ` Kirill Tkhai
2018-03-21 13:23 ` [PATCH 10/10] mm: Clear shrinker bit if there are no objects related to memcg Kirill Tkhai
2018-03-24 20:33   ` Vladimir Davydov
2018-03-26 15:37     ` Kirill Tkhai
2018-03-21 13:23 ` [PATCH 00/10] Improve shrink_slab() scalability (old complexity was O(n^2), new is O(n)) Kirill Tkhai

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