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Wed, 02 Sep 2026 17:43:34 +0000 X-Mizu-Trace-ID: ea98a50b791055b0 X-Migadu-Flow: FLOW_OUT From: Shakeel Butt To: Andrew Morton Cc: Michal Hocko , Johannes Weiner , Roman Gushchin , Muchun Song , David Hildenbrand , Lorenzo Stoakes , Kairui Song , Qi Zheng , Barry Song , Axel Rasmussen , tjmercier@google.com, Meta kernel team , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 6/8] memcg: remove the per-node soft limit tree fields Date: Wed, 2 Sep 2026 10:43:09 -0700 Message-ID: <20260902174311.1772372-7-shakeel.butt@linux.dev> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260902174311.1772372-1-shakeel.butt@linux.dev> References: <20260902174311.1772372-1-shakeel.butt@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 6CCEB40007 X-Stat-Signature: d7jr6enesy7pjz8a1537c74yige4ch9g X-HE-Tag: 1788371016-60093 X-HE-Meta: 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 ZuQSdRsc S3l/WOEBIDaoZ6hn+91G6LSQgFENYgo2+rsDNpDivUNtxC6ivf5o5/eRkbBiUy981pAB4gTBBPCjkUrTSQZcrp/08iwPuL6zyYV9AP3ocwlBrBOmlnkZZNP+V6+0IwTCCzkaNJ2gDwNxB9NchmGG/JpQRpAI8cZyxCFHmGIvEDNncMe8t7gkAtoMBEAXdC2+kFQybAwzHq8+V+tk3m6s0V4VaDddQrk8HRVdrhm0zgSvsV6aSq65x4rBvR+qCq52ZsFNLNud+HH1AlnTpIv4/Knrnyu12USBIQ3OXsr0Exab5rEBi++2V/HvObA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: tree_node, usage_in_excess and on_tree only existed for the soft limit rbtree. They also doubled as the buffer between the read-mostly head of struct mem_cgroup_per_node and its update-often tail, so replace them with the explicit padding that CONFIG_MEMCG_V1=n already used. Signed-off-by: Shakeel Butt Acked-by: Michal Hocko Acked-by: Lorenzo Stoakes (ARM) --- include/linux/memcontrol.h | 13 ------------- 1 file changed, 13 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 11c1fa88d6fd..1eababed16f5 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -95,20 +95,7 @@ struct mem_cgroup_per_node { struct lruvec_stats *lruvec_stats; struct shrinker_info __rcu *shrinker_info; -#ifdef CONFIG_MEMCG_V1 - /* - * Memcg-v1 only stuff in middle as buffer between read mostly fields - * and update often fields to avoid false sharing. If v1 stuff is - * not present, an explicit padding is needed. - */ - - struct rb_node tree_node; /* RB tree node */ - unsigned long usage_in_excess;/* Set to the value by which */ - /* the soft limit is exceeded*/ - bool on_tree; -#else CACHELINE_PADDING(_pad1_); -#endif /* Fields which get updated often at the end. */ struct lruvec lruvec; -- 2.53.0-Meta