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Sat, 31 Oct 2026 10:12:54 +0000 X-Mizu-Trace-ID: 3800c739b860db0f X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset=us-ascii X-Archived-By: Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3901.100.1.1.12\)) Subject: Re: [PATCH v5 4/6] mm/vmscan: pass scan_control to the vmscan tracepoints From: Muchun Song In-Reply-To: <20261031090041.58574-5-ridong.chen@linux.dev> Date: Sat, 31 Oct 2026 18:12:27 +0800 Cc: Steven Rostedt , Masami Hiramatsu , Andrew Morton , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Dave Chinner , Mathieu Desnoyers , Qi Zheng , Kairui Song , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , David Hildenbrand , Lorenzo Stoakes , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" , bpf@vger.kernel.org, Ridong Chen , "open list:BPF [MISC]:Keyword:(?:b|_)bpf(?:b|_) ) Content-Transfer-Encoding: 7bit Message-Id: References: <20261031090041.58574-1-ridong.chen@linux.dev> <20261031090041.58574-5-ridong.chen@linux.dev> To: Ridong Chen X-Mailer: Apple Mail (2.3901.100.1.1.12) X-Stat-Signature: sx4f63f11wkjpbtjaidckmii9uuai1dk X-Rspamd-Queue-Id: 8AAE9C0003 X-Rspam-User: X-Rspamd-Server: rspam12 X-Spam-Status: No, score=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-HE-Tag: 1793441577-62282 X-HE-Meta: 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 T5/k1ma5 iTdJKwGzIsiWwv2ujz6Y9aKuXW0xWOO9RoxB+OhK1pUK5KFoPFDeiX9bhzH3USdR1G9hgkHVVY6NVlryS1ZZxXtZEuoocIalQo7lUYGVu8yE0JL0Ynk1BxokWitRhQTDo05wh/uyeJ9H8tZPM6xOi0WvN3mnBdkkgi5yGoY1L5Lrl9ph74gekQKvoqmVFM0edY/Je1F5+L5k1bpYzSdWXIXjcqVe95wQdmvVCZ1yTRDsuXbA50aX2xQgaZrbI0Joq+VkjDh70aHa/ju3x3pnxh1wicwg9D15/JAOKtcIoAWLR3NYE697gujJ7RYPdNjOJJ4WKrHXFlzqorIDhBCjhGnJEPLmKGZmqN+tcQIZi6Lj3a1T/GB1mCTKWJOUFdgoZ3Ok3P1z5FyUeDoJPOVkpcJC8NPz1DMHoqa/8iJ3DDZUrHasuCh/t4KqYNlytvtU/w7Z16R2Fbk2Ymc/VM1WItZT6kkoQPC0qoAJq Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 > On Oct 31, 2026, at 17:00, Ridong Chen wrote: > > From: Ridong Chen > > Several vmscan tracepoints spell out reclaim state as individual > arguments, all of which the caller already holds in struct scan_control. > Now that the struct is visible from the trace header, pass sc directly > and pick the fields out in TP_fast_assign instead of spelling them out > at every callsite: > > - mm_vmscan_direct_reclaim_begin, mm_vmscan_memcg_reclaim_begin and > mm_vmscan_node_reclaim_begin: gfp_mask and order. > > - mm_vmscan_lru_isolate, mm_vmscan_lru_shrink_inactive and > mm_vmscan_lru_shrink_active: reclaim_idx, order and priority. > > - mm_vmscan_reclaim_pages: nr_scanned. nr_reclaimed stays a separate > argument: it is the return value of shrink_folio_list(), which does > not update sc->nr_reclaimed. > > - mm_vmscan_balance_pgdat_end: order and nr_reclaimed. highest_zoneidx > stays a separate argument: it is a balance_pgdat() parameter, and > sc.reclaim_idx may differ from it by the time the end event fires. > > No functional change. The tracefs event format (TP_STRUCT__entry and > TP_printk) is unchanged, so tracefs-based consumers are unaffected. > BPF programs attached via raw_tp/tp_btf see the new TP_PROTO and need > to be adjusted; tracepoints are not a stable ABI (see > Documentation/bpf/bpf_design_QA.rst). > > Signed-off-by: Ridong Chen Acked-by: Muchun Song Thanks