From: Vlastimil Babka <vbabka@suse.cz>
To: Roman Gushchin <guro@fb.com>, Yang Shi <shy828301@gmail.com>
Cc: ktkhai@virtuozzo.com, shakeelb@google.com, david@fromorbit.com,
hannes@cmpxchg.org, mhocko@suse.com, akpm@linux-foundation.org,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [v7 PATCH 04/12] mm: vmscan: remove memcg_shrinker_map_size
Date: Wed, 10 Feb 2021 19:14:49 +0100 [thread overview]
Message-ID: <d27223a8-0a00-b670-da5b-205d4c16a2e4@suse.cz> (raw)
In-Reply-To: <20210209204314.GG524633@carbon.DHCP.thefacebook.com>
On 2/9/21 9:43 PM, Roman Gushchin wrote:
> On Tue, Feb 09, 2021 at 09:46:38AM -0800, Yang Shi wrote:
>> Both memcg_shrinker_map_size and shrinker_nr_max is maintained, but actually the
>> map size can be calculated via shrinker_nr_max, so it seems unnecessary to keep both.
>> Remove memcg_shrinker_map_size since shrinker_nr_max is also used by iterating the
>> bit map.
>>
>> Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>
>> Signed-off-by: Yang Shi <shy828301@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
>> ---
>> mm/vmscan.c | 18 +++++++++---------
>> 1 file changed, 9 insertions(+), 9 deletions(-)
>>
>> diff --git a/mm/vmscan.c b/mm/vmscan.c
>> index e4ddaaaeffe2..641077b09e5d 100644
>> --- a/mm/vmscan.c
>> +++ b/mm/vmscan.c
>> @@ -185,8 +185,10 @@ static LIST_HEAD(shrinker_list);
>> static DECLARE_RWSEM(shrinker_rwsem);
>>
>> #ifdef CONFIG_MEMCG
>> +static int shrinker_nr_max;
>>
>> -static int memcg_shrinker_map_size;
>> +#define NR_MAX_TO_SHR_MAP_SIZE(nr_max) \
>> + (DIV_ROUND_UP(nr_max, BITS_PER_LONG) * sizeof(unsigned long))
>
> How about something like this?
>
> static inline int shrinker_map_size(int nr_items)
> {
> return DIV_ROUND_UP(nr_items, BITS_PER_LONG) * sizeof(unsigned long);
> }
>
> I think it look less cryptic.
Yeah that looks nicer so I'm fine with that potential change.
> The rest of the patch looks good to me.
>
> Thanks!
>
next prev parent reply other threads:[~2021-02-10 18:16 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 17:46 [v7 PATCH 0/12] Make shrinker's nr_deferred memcg aware Yang Shi
2021-02-09 17:46 ` [v7 PATCH 01/12] mm: vmscan: use nid from shrink_control for tracepoint Yang Shi
2021-02-09 19:14 ` Shakeel Butt
2021-02-10 16:58 ` Yang Shi
2021-02-09 19:21 ` Roman Gushchin
2021-02-09 17:46 ` [v7 PATCH 02/12] mm: vmscan: consolidate shrinker_maps handling code Yang Shi
2021-02-09 20:27 ` Roman Gushchin
2021-02-10 14:19 ` Shakeel Butt
2021-02-09 17:46 ` [v7 PATCH 03/12] mm: vmscan: use shrinker_rwsem to protect shrinker_maps allocation Yang Shi
2021-02-09 20:33 ` Roman Gushchin
2021-02-09 23:28 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 04/12] mm: vmscan: remove memcg_shrinker_map_size Yang Shi
2021-02-09 20:43 ` Roman Gushchin
2021-02-09 23:31 ` Yang Shi
2021-02-10 18:14 ` Vlastimil Babka [this message]
2021-02-09 17:46 ` [v7 PATCH 05/12] mm: memcontrol: rename shrinker_map to shrinker_info Yang Shi
2021-02-09 20:50 ` Roman Gushchin
2021-02-09 23:33 ` Yang Shi
2021-02-10 0:16 ` Roman Gushchin
2021-02-11 16:47 ` Kirill Tkhai
2021-02-11 17:29 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 06/12] mm: vmscan: add shrinker_info_protected() helper Yang Shi
2021-02-10 0:22 ` Roman Gushchin
2021-02-10 1:07 ` Yang Shi
2021-02-10 1:29 ` Roman Gushchin
2021-02-10 12:12 ` Kirill Tkhai
2021-02-10 18:17 ` Vlastimil Babka
2021-02-12 6:54 ` [mm] bd741fb2ad: WARNING:suspicious_RCU_usage kernel test robot
2021-02-09 17:46 ` [v7 PATCH 07/12] mm: vmscan: use a new flag to indicate shrinker is registered Yang Shi
2021-02-10 0:39 ` Roman Gushchin
2021-02-10 1:12 ` Yang Shi
2021-02-10 1:34 ` Roman Gushchin
2021-02-10 1:55 ` Yang Shi
2021-02-10 18:45 ` Yang Shi
2021-02-10 18:23 ` Vlastimil Babka
2021-02-09 17:46 ` [v7 PATCH 08/12] mm: vmscan: add per memcg shrinker nr_deferred Yang Shi
2021-02-10 1:10 ` Roman Gushchin
2021-02-10 1:25 ` Yang Shi
2021-02-10 1:40 ` Roman Gushchin
2021-02-10 1:57 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 09/12] mm: vmscan: use per memcg nr_deferred of shrinker Yang Shi
2021-02-10 1:27 ` Roman Gushchin
2021-02-10 1:52 ` Yang Shi
2021-02-10 14:36 ` Kirill Tkhai
2021-02-10 16:41 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 10/12] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Yang Shi
2021-02-10 1:23 ` Roman Gushchin
2021-02-09 17:46 ` [v7 PATCH 11/12] mm: memcontrol: reparent nr_deferred when memcg offline Yang Shi
2021-02-10 1:18 ` Roman Gushchin
2021-02-09 17:46 ` [v7 PATCH 12/12] mm: vmscan: shrink deferred objects proportional to priority Yang Shi
2021-02-11 13:10 ` Vlastimil Babka
2021-02-11 17:29 ` Yang Shi
2021-02-11 18:52 ` Vlastimil Babka
2021-02-11 19:15 ` Yang Shi
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