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From: Muchun Song <muchun.song@linux.dev>
To: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@kernel.org>,
	Roman Gushchin <roman.gushchin@linux.dev>,
	Qi Zheng <qi.zheng@linux.dev>, Alexandre Ghiti <alex@ghiti.fr>,
	Joshua Hahn <joshua.hahnjy@gmail.com>,
	Harry Yoo <harry@kernel.org>,
	Meta kernel team <kernel-team@meta.com>,
	linux-mm@kvack.org, cgroups@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	kernel test robot <oliver.sang@intel.com>
Subject: Re: [PATCH 1/4] memcg: store node_id instead of pglist_data pointer
Date: Wed, 20 May 2026 14:13:47 +0800	[thread overview]
Message-ID: <0B4974B5-FB9B-47CD-956A-B13BCF278163@linux.dev> (raw)
In-Reply-To: <20260520053123.2709959-2-shakeel.butt@linux.dev>



> On May 20, 2026, at 13:31, Shakeel Butt <shakeel.butt@linux.dev> wrote:
> 
> The struct obj_stock_pcp stores a pointer to pglist_data for the slab
> stats cached on the cpu. On 64-bit machines, this costs 8 bytes. The
> pointer is not strictly required: NODE_DATA() can recover it from the
> node id. Replace cached_pgdat with int16_t node_id and use NUMA_NO_NODE
> as the "no stats cached" sentinel.
> 
> At the moment all the archs limit MAX_NUMNODES to 1024 so int16_t is
> plenty; a BUILD_BUG_ON() makes sure we notice if that ever changes.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
> Tested-by: kernel test robot <oliver.sang@intel.com>

Acked-by: Muchun Song <muchun.song@linux.dev>

Thanks.


  parent reply	other threads:[~2026-05-20  6:14 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-20  5:31 [PATCH 0/4] memcg: shrink obj_stock_pcp and cache multiple objcgs Shakeel Butt
2026-05-20  5:31 ` [PATCH 1/4] memcg: store node_id instead of pglist_data pointer Shakeel Butt
2026-05-20  6:01   ` Harry Yoo
2026-05-20  6:13   ` Muchun Song [this message]
2026-05-20  5:31 ` [PATCH 2/4] memcg: uint16_t for nr_bytes in obj_stock_pcp Shakeel Butt
2026-05-20  6:41   ` Harry Yoo
2026-05-20  7:01   ` Harry Yoo
2026-05-21  1:01     ` Shakeel Butt
2026-05-20 13:20   ` David Laight
2026-05-21  1:03     ` Shakeel Butt
2026-05-20  5:31 ` [PATCH 3/4] memcg: int16_t for cached slab stats Shakeel Butt
2026-05-20  7:25   ` Harry Yoo
2026-05-20  5:31 ` [PATCH 4/4] memcg: multi objcg charge support Shakeel Butt
2026-05-20  9:35   ` Harry Yoo
2026-05-21  1:05     ` Shakeel Butt
2026-05-21  1:43       ` Harry Yoo
2026-05-21 20:19         ` Shakeel Butt
2026-05-21  3:22       ` Joshua Hahn

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