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[PATCH 2/2] mm: multi-gen lru: fix stat count To: Yu Zhao Cc: Steven Rostedt , Masami Hiramatsu , Andrew Morton , Suren Baghdasaryan , Vlastimil Babka , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, opensource.kernel@vivo.com References: <20231018082104.3918770-1-link@vivo.com> <20231018082104.3918770-3-link@vivo.com> From: Huan Yang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SG2PR04CA0192.apcprd04.prod.outlook.com (2603:1096:4:14::30) To PUZPR06MB5676.apcprd06.prod.outlook.com (2603:1096:301:f8::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB5676:EE_|KL1PR06MB6985:EE_ X-MS-Office365-Filtering-Correlation-Id: 83e6445b-13a0-45bb-ed53-08dbd06cd004 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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stat into sc, >>>> we can't get info like nr_dirty\congested in reclaim, and then >>>> control writeback, dirty number and mark as LRUVEC_CONGESTED, or >>>> just bpf trace shrink and get correct sc stat. >>>> >>>> This patch fix this by simple copy code from shrink_inactive_list when >>>> end of shrink list. >>> MGLRU doesn't try to write back dirt file pages in the reclaim path -- >>> it filters them out in sort_folio() and leaves them to the page >> Nice to know this, sort_folio() filters some folio indeed. >> But, I want to know, if we touch some folio in shrink_folio_list(), may some >> folio become dirty or writeback even if sort_folio() filter then? > Good question: in that case MGLRU still doesn't try to write those > folios back because isolate_folio() cleared PG_reclaim and > shrink_folio_list() checks PG_reclaim: Thank you too much. So, MGLRU have many diff between typic LRU reclaim. So, why don't offer MGLRU a own shrink path to avoid so many check of folio? And more think, it's nice to assign a anon/file reclaim hook into anon_vma/address_space? (Each folio, have their own shrink path, don't try check path if it no need.) > > if (folio_test_dirty(folio)) { > /* > * Only kswapd can writeback filesystem folios > * to avoid risk of stack overflow. But avoid > * injecting inefficient single-folio I/O into > * flusher writeback as much as possible: only > * write folios when we've encountered many > * dirty folios, and when we've already scanned > * the rest of the LRU for clean folios and see > * the same dirty folios again (with the reclaim > * flag set). > */ > if (folio_is_file_lru(folio) && > (!current_is_kswapd() || > !folio_test_reclaim(folio) || > !test_bit(PGDAT_DIRTY, &pgdat->flags))) { Thanks