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MN0PR12MB6079.namprd12.prod.outlook.com (2603:10b6:208:3c9::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7807.26; Mon, 29 Jul 2024 04:50:08 +0000 Received: from IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134]) by IA1PR12MB6434.namprd12.prod.outlook.com ([fe80::dbf7:e40c:4ae9:8134%3]) with mapi id 15.20.7807.026; Mon, 29 Jul 2024 04:50:08 +0000 Message-ID: <5660bd90-3094-418a-8a05-58e222dacfb5@amd.com> Date: Mon, 29 Jul 2024 10:19:57 +0530 User-Agent: Mozilla Thunderbird Subject: Re: Hard and soft lockups with FIO and LTP runs on a large system To: Zhaoyang Huang , "zhaoyang.huang" Cc: Neeraj.Upadhyay@amd.com, akpm@linux-foundation.org, david@redhat.com, kinseyho@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mgorman@suse.de, mjguzik@gmail.com, nikunj@amd.com, vbabka@suse.cz, willy@infradead.org, yuzhao@google.com, steve.kang@unisoc.com References: <893a263a-0038-4b4b-9031-72567b966f73@amd.com> 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PaVyufalap4k03+dKzZkFXfEU+TelyjJTrFEe/nIVO7quE5jMgcHbA/eJ2VX6YHlgLWW1asH1mBJNagEOO43zjGJMYLFymrphP0yTdo7F2L9K3+OLLh6aifOj1IDM0qgGBCXS2SObrij1YpRifycwjmAZ+enU5uXbiGgZ3U3UfYcQHFf4b9QCe26IhKMyBjp6BZljmz5v3rem0fxbhEY1jDbFg2ApLST28PqDEmUfZQxKTOr8q0AWvmwh3AleUo/FW+/L7IcZQkLvOj5HmIx/oOictQ81pbvfvHtAfNwD2eVIC8klOnIVq8fxhftTVLWlNspEw+tkxWDbxlouzKOdEpwlNp/QhVTOJO4XeOYkq6oxS/Ro+nhUE3kgwCPvrycRTGZ86cA1l6513dMLT9S3/+8JYw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, 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 26-Jul-24 8:56 AM, Zhaoyang Huang wrote: > On Thu, Jul 25, 2024 at 6:00 PM zhaoyang.huang > wrote: >> From the callstack of lock holder, it is looks like a scability issue rather than a deadlock. Unlike legacy LRU management, there is no throttling mechanism for global reclaim under mglru so far.Could we apply the similar method to throttle the reclaim when it is too aggresive. I am wondering if this patch which is a rough version could help on this? >> >> diff --git a/mm/vmscan.c b/mm/vmscan.c >> index 2e34de9cd0d4..827036e21f24 100644 >> --- a/mm/vmscan.c >> +++ b/mm/vmscan.c >> @@ -4520,6 +4520,50 @@ static int isolate_folios(struct lruvec *lruvec, struct scan_control *sc, int sw >> return scanned; >> } >> >> +static void lru_gen_throttle(pg_data_t *pgdat, struct scan_control *sc) >> +{ >> + struct lruvec *target_lruvec = mem_cgroup_lruvec(sc->target_mem_cgroup, pgdat); >> + >> + if (current_is_kswapd()) { >> + if (sc->nr.writeback && sc->nr.writeback == sc->nr.taken) >> + set_bit(PGDAT_WRITEBACK, &pgdat->flags); >> + >> + /* Allow kswapd to start writing pages during reclaim.*/ >> + if (sc->nr.unqueued_dirty == sc->nr.file_taken) >> + set_bit(PGDAT_DIRTY, &pgdat->flags); >> + >> + if (sc->nr.immediate) >> + reclaim_throttle(pgdat, VMSCAN_THROTTLE_WRITEBACK); >> + } >> + >> + /* >> + * Tag a node/memcg as congested if all the dirty pages were marked >> + * for writeback and immediate reclaim (counted in nr.congested). >> + * >> + * Legacy memcg will stall in page writeback so avoid forcibly >> + * stalling in reclaim_throttle(). >> + */ >> + if (sc->nr.dirty && (sc->nr.dirty / 2 < sc->nr.congested)) { >> + if (cgroup_reclaim(sc) && writeback_throttling_sane(sc)) >> + set_bit(LRUVEC_CGROUP_CONGESTED, &target_lruvec->flags); >> + >> + if (current_is_kswapd()) >> + set_bit(LRUVEC_NODE_CONGESTED, &target_lruvec->flags); >> + } >> + >> + /* >> + * Stall direct reclaim for IO completions if the lruvec is >> + * node is congested. Allow kswapd to continue until it >> + * starts encountering unqueued dirty pages or cycling through >> + * the LRU too quickly. >> + */ >> + if (!current_is_kswapd() && current_may_throttle() && >> + !sc->hibernation_mode && >> + (test_bit(LRUVEC_CGROUP_CONGESTED, &target_lruvec->flags) || >> + test_bit(LRUVEC_NODE_CONGESTED, &target_lruvec->flags))) >> + reclaim_throttle(pgdat, VMSCAN_THROTTLE_CONGESTED); >> +} >> + >> static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swappiness) >> { >> int type; >> @@ -4552,6 +4596,16 @@ static int evict_folios(struct lruvec *lruvec, struct scan_control *sc, int swap >> retry: >> reclaimed = shrink_folio_list(&list, pgdat, sc, &stat, false); >> sc->nr_reclaimed += reclaimed; >> + sc->nr.dirty += stat.nr_dirty; >> + sc->nr.congested += stat.nr_congested; >> + sc->nr.unqueued_dirty += stat.nr_unqueued_dirty; >> + sc->nr.writeback += stat.nr_writeback; >> + sc->nr.immediate += stat.nr_immediate; >> + sc->nr.taken += scanned; >> + >> + if (type) >> + sc->nr.file_taken += scanned; >> + >> trace_mm_vmscan_lru_shrink_inactive(pgdat->node_id, >> scanned, reclaimed, &stat, sc->priority, >> type ? LRU_INACTIVE_FILE : LRU_INACTIVE_ANON); >> @@ -5908,6 +5962,7 @@ static void shrink_node(pg_data_t *pgdat, struct scan_control *sc) >> >> if (lru_gen_enabled() && root_reclaim(sc)) { >> lru_gen_shrink_node(pgdat, sc); >> + lru_gen_throttle(pgdat, sc); >> return; >> } > Hi Bharata, > This patch arised from a regression Android test case failure which > allocated 1GB virtual memory by each over 8 threads on an 5.5GB RAM > system. This test could pass on legacy LRU management while failing > under MGLRU as a watchdog monitor detected abnormal system-wide > schedule status(watchdog can't be scheduled within 60 seconds). This > patch with a slight change as below got passed in the test whereas has > not been investigated deeply for how it was done. Theoretically, this > patch enrolled the similar reclaim throttle mechanism as legacy do > which could reduce the contention of lruvec->lru_lock. I think this > patch is quite naive for now， but I am hoping it could help you as > your case seems like a scability issue of memory pressure rather than > a deadlock issue. Thank you! > > the change of the applied version(try to throttle the reclaim before > instead of after) > if (lru_gen_enabled() && root_reclaim(sc)) { > + lru_gen_throttle(pgdat, sc); > lru_gen_shrink_node(pgdat, sc); > - lru_gen_throttle(pgdat, sc); > return; > } Thanks Zhaoyang Huang for the patch, will give this a test and report back. Regards, Bharata.