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Thu, 16 Jan 2025 11:10:46 GMT Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D3A0B58079; Thu, 16 Jan 2025 11:10:27 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 445BE58060; Thu, 16 Jan 2025 11:10:24 +0000 (GMT) Received: from [9.171.16.18] (unknown [9.171.16.18]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 16 Jan 2025 11:10:23 +0000 (GMT) Message-ID: <7f370dd2-a1d2-4b35-ac40-0380633846fc@linux.ibm.com> Date: Thu, 16 Jan 2025 16:40:21 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC] mm/swap.c: Enable promotion of unmapped MGLRU page cache pages To: Matthew Wilcox Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Gregory Price , Yu Zhao , Ritesh Harjani , "Aneesh Kumar K . V" , David Hildenbrand , Huang Ying , Johannes Weiner References: <20250115120625.3785-1-donettom@linux.ibm.com> Content-Language: en-US From: Donet Tom In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: SqP7buP1WG16iLM_7Rk9QcdiRyFL5-qx X-Proofpoint-GUID: Dj56wYbv7PoRPMmmMtSejMOsy1vMkQC8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-16_04,2025-01-16_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 malwarescore=0 impostorscore=0 mlxscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 suspectscore=0 clxscore=1015 mlxlogscore=837 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501160082 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 4DA2420011 X-Stat-Signature: tfs45x5gb6asgro8bx6ucr67ri1fw1d7 X-Rspam-User: X-HE-Tag: 1737025855-285891 X-HE-Meta: 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 WolorLtl KmQQMaEvPfPz0dc1N/OBxRo0Vd6QL9UW9qRT2tzUQGXx9HG89WVWdnX16evlV4qUI12H4x8uVmPubHdwIbxlfVjee+kns8WIeQx3HL3oRavnysuczIUnYbqH9lvh85Ka0ZECy32k0HkqA6w+w08Fhzx6zn245pZBO2HcRnL3IxhOm6Ber5S9b2WJhssMU6o6J4HnreRs7ujxWVbjt5cKJPkgOsJrViR11iTwPcy4B6k0GizTkESbXCrNfn0LVGmRaanIHBRdWDkUp9kIcMs8h7dlK3QrfBxCICkRVGQ+ev/SyoUuWFCEurn5AXRLjGHiolMXazmvsZsNcb6g= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000097, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 1/15/25 18:55, Matthew Wilcox wrote: > On Wed, Jan 15, 2025 at 06:06:25AM -0600, Donet Tom wrote: >> An MGLRU page cache page is eligible for promotion when: >> >> 1. Memory Tiering and pagecache_promotion_enabled are enabled >> 2. It resides in a lower memory tier. >> 3. It is referenced. >> 4. It is part of the working set. >> 5. It belongs to the active list. >> For MGLRU, the youngest generation and the youngest generation - 1 >> are treated as the active list. > ... why do you only promote folios if they belong to a memcg? I missed adding non memcg folios for promotion . I will add them too. > >> +promo_candid: >> + if (!folio_test_isolated(folio) && >> + (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) && >> + numa_pagecache_promotion_enabled) { >> + memcg = folio_memcg(folio); >> + if (memcg) { >> + lruvec = mem_cgroup_lruvec(memcg, folio_pgdat(folio)); >> + gen = folio_lru_gen(folio); >> + >> + if ((gen < MAX_NR_GENS) && lru_gen_is_active(lruvec, gen)) >> + promotion_candidate(folio); >> + } > Should there be an 'else' clause here? Or should it be: > > lruvec = mem_cgroup_lruvec(memcg, folio_pgdat(folio)); > gen = folio_lru_gen(folio); > if ((gen < MAX_NR_GENS) && lru_gen_is_active(lruvec, gen)) > promotion_candidate(folio); > Yes, there should be an else block to handle the promotion of non memcg folios. Does this approach look correct to you?         } while (!try_cmpxchg(&folio->flags, &old_flags, new_flags)); + +promo_candid: +       if (!folio_test_isolated(folio) && +               (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) && +               numa_pagecache_promotion_enabled) { +               pgdat = folio_pgdat(folio); +               gen = folio_lru_gen(folio); + +               if (mem_cgroup_disabled()) +                       lruvec = &pgdat->__lruvec; +               else { +                       memcg = folio_memcg(folio); +                       lruvec = mem_cgroup_lruvec(memcg, pgdat); +               } + +               if ((gen < MAX_NR_GENS) && lru_gen_is_active(lruvec, gen)) +                       promotion_candidate(folio); +       }  }