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Wed, 22 Nov 2023 13:02:05 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Wed, 22 Nov 2023 13:02:04 +0300 From: Dmitry Rokosov To: , , , , , , , CC: , , , , , , Dmitry Rokosov Subject: [PATCH v2 1/2] mm: memcg: print out cgroup name in the memcg tracepoints Date: Wed, 22 Nov 2023 13:01:55 +0300 Message-ID: <20231122100156.6568-2-ddrokosov@salutedevices.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20231122100156.6568-1-ddrokosov@salutedevices.com> References: <20231122100156.6568-1-ddrokosov@salutedevices.com> MIME-Version: 1.0 X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181525 [Nov 22 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: ddrokosov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 3 0.3.3 e5c6a18a9a9bff0226d530c5b790210c0bd117c8, {Tracking_from_domain_doesnt_match_to}, salutedevices.com:7.1.1;127.0.0.199:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1;100.64.160.123:7.1.2, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/22 05:48:00 #22499758 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on fry.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (fry.vger.email [0.0.0.0]); Wed, 22 Nov 2023 02:02:26 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783258006643729894 X-GMAIL-MSGID: 1783258006643729894 Sometimes it is necessary to understand in which memcg tracepoint event occurred. The function cgroup_name() is a useful tool for this purpose. To integrate cgroup_name() into the existing memcg tracepoints, this patch introduces a new tracepoint template for the begin() and end() events, utilizing static __array() to store the cgroup name. Signed-off-by: Dmitry Rokosov --- include/trace/events/vmscan.h | 77 +++++++++++++++++++++++++++++------ mm/vmscan.c | 10 ++--- 2 files changed, 70 insertions(+), 17 deletions(-) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index d2123dd960d5..9b49cd120ae9 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -141,19 +141,47 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_direct_reclaim_b ); #ifdef CONFIG_MEMCG -DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin, - TP_PROTO(int order, gfp_t gfp_flags), +DECLARE_EVENT_CLASS(mm_vmscan_memcg_reclaim_begin_template, - TP_ARGS(order, gfp_flags) + TP_PROTO(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg), + + TP_ARGS(order, gfp_flags, memcg), + + TP_STRUCT__entry( + __field(int, order) + __field(unsigned long, gfp_flags) + __array(char, name, NAME_MAX + 1) + ), + + TP_fast_assign( + __entry->order = order; + __entry->gfp_flags = (__force unsigned long)gfp_flags; + cgroup_name(memcg->css.cgroup, + __entry->name, + sizeof(__entry->name)); + ), + + TP_printk("order=%d gfp_flags=%s memcg=%s", + __entry->order, + show_gfp_flags(__entry->gfp_flags), + __entry->name) ); -DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_softlimit_reclaim_begin, +DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin, - TP_PROTO(int order, gfp_t gfp_flags), + TP_PROTO(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg), - TP_ARGS(order, gfp_flags) + TP_ARGS(order, gfp_flags, memcg) +); + +DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template, mm_vmscan_memcg_softlimit_reclaim_begin, + + TP_PROTO(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg), + + TP_ARGS(order, gfp_flags, memcg) ); + #endif /* CONFIG_MEMCG */ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template, @@ -181,19 +209,44 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_direct_reclaim_end ); #ifdef CONFIG_MEMCG -DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_reclaim_end, - TP_PROTO(unsigned long nr_reclaimed), +DECLARE_EVENT_CLASS(mm_vmscan_memcg_reclaim_end_template, - TP_ARGS(nr_reclaimed) + TP_PROTO(unsigned long nr_reclaimed, const struct mem_cgroup *memcg), + + TP_ARGS(nr_reclaimed, memcg), + + TP_STRUCT__entry( + __field(unsigned long, nr_reclaimed) + __array(char, name, NAME_MAX + 1) + ), + + TP_fast_assign( + __entry->nr_reclaimed = nr_reclaimed; + cgroup_name(memcg->css.cgroup, + __entry->name, + sizeof(__entry->name)); + ), + + TP_printk("nr_reclaimed=%lu memcg=%s", + __entry->nr_reclaimed, + __entry->name) ); -DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_reclaim_end, +DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template, mm_vmscan_memcg_reclaim_end, - TP_PROTO(unsigned long nr_reclaimed), + TP_PROTO(unsigned long nr_reclaimed, const struct mem_cgroup *memcg), - TP_ARGS(nr_reclaimed) + TP_ARGS(nr_reclaimed, memcg) ); + +DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template, mm_vmscan_memcg_softlimit_reclaim_end, + + TP_PROTO(unsigned long nr_reclaimed, const struct mem_cgroup *memcg), + + TP_ARGS(nr_reclaimed, memcg) +); + #endif /* CONFIG_MEMCG */ TRACE_EVENT(mm_shrink_slab_start, diff --git a/mm/vmscan.c b/mm/vmscan.c index 1080209a568b..45780952f4b5 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -7088,8 +7088,8 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg, sc.gfp_mask = (gfp_mask & GFP_RECLAIM_MASK) | (GFP_HIGHUSER_MOVABLE & ~GFP_RECLAIM_MASK); - trace_mm_vmscan_memcg_softlimit_reclaim_begin(sc.order, - sc.gfp_mask); + trace_mm_vmscan_memcg_softlimit_reclaim_begin(sc.order, sc.gfp_mask, + memcg); /* * NOTE: Although we can get the priority field, using it @@ -7100,7 +7100,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg, */ shrink_lruvec(lruvec, &sc); - trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed); + trace_mm_vmscan_memcg_softlimit_reclaim_end(sc.nr_reclaimed, memcg); *nr_scanned = sc.nr_scanned; @@ -7134,13 +7134,13 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg, struct zonelist *zonelist = node_zonelist(numa_node_id(), sc.gfp_mask); set_task_reclaim_state(current, &sc.reclaim_state); - trace_mm_vmscan_memcg_reclaim_begin(0, sc.gfp_mask); + trace_mm_vmscan_memcg_reclaim_begin(0, sc.gfp_mask, memcg); noreclaim_flag = memalloc_noreclaim_save(); nr_reclaimed = do_try_to_free_pages(zonelist, &sc); memalloc_noreclaim_restore(noreclaim_flag); - trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed); 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Wed, 22 Nov 2023 13:02:06 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Wed, 22 Nov 2023 13:02:05 +0300 From: Dmitry Rokosov To: , , , , , , , CC: , , , , , , Dmitry Rokosov Subject: [PATCH v2 2/2] mm: memcg: introduce new event to trace shrink_memcg Date: Wed, 22 Nov 2023 13:01:56 +0300 Message-ID: <20231122100156.6568-3-ddrokosov@salutedevices.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20231122100156.6568-1-ddrokosov@salutedevices.com> References: <20231122100156.6568-1-ddrokosov@salutedevices.com> MIME-Version: 1.0 X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181525 [Nov 22 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: ddrokosov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 3 0.3.3 e5c6a18a9a9bff0226d530c5b790210c0bd117c8, {Tracking_from_domain_doesnt_match_to}, salutedevices.com:7.1.1;127.0.0.199:7.1.2;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1;p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1;100.64.160.123:7.1.2, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/22 05:48:00 #22499758 X-KSMG-AntiVirus-Status: Clean, skipped X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Wed, 22 Nov 2023 02:02:37 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1783258065002063315 X-GMAIL-MSGID: 1783258065002063315 The shrink_memcg flow plays a crucial role in memcg reclamation. Currently, it is not possible to trace this point from non-direct reclaim paths. However, direct reclaim has its own tracepoint, so there is no issue there. In certain cases, when debugging memcg pressure, developers may need to identify all potential requests for memcg reclamation including kswapd(). The patchset introduces the tracepoints mm_vmscan_memcg_shrink_{begin|end}() to address this problem. Example of output in the kswapd context (non-direct reclaim): kswapd0-39 [001] ..... 240.356378: mm_vmscan_memcg_shrink_begin: order=0 gfp_flags=GFP_KERNEL memcg=test kswapd0-39 [001] ..... 240.356396: mm_vmscan_memcg_shrink_end: nr_reclaimed=0 memcg=test kswapd0-39 [001] ..... 240.356420: mm_vmscan_memcg_shrink_begin: order=0 gfp_flags=GFP_KERNEL memcg=test kswapd0-39 [001] ..... 240.356454: mm_vmscan_memcg_shrink_end: nr_reclaimed=1 memcg=test kswapd0-39 [001] ..... 240.356479: mm_vmscan_memcg_shrink_begin: order=0 gfp_flags=GFP_KERNEL memcg=test kswapd0-39 [001] ..... 240.356506: mm_vmscan_memcg_shrink_end: nr_reclaimed=4 memcg=test kswapd0-39 [001] ..... 240.356525: mm_vmscan_memcg_shrink_begin: order=0 gfp_flags=GFP_KERNEL memcg=test kswapd0-39 [001] ..... 240.356593: mm_vmscan_memcg_shrink_end: nr_reclaimed=11 memcg=test kswapd0-39 [001] ..... 240.356614: mm_vmscan_memcg_shrink_begin: order=0 gfp_flags=GFP_KERNEL memcg=test kswapd0-39 [001] ..... 240.356738: mm_vmscan_memcg_shrink_end: nr_reclaimed=25 memcg=test kswapd0-39 [001] ..... 240.356790: mm_vmscan_memcg_shrink_begin: order=0 gfp_flags=GFP_KERNEL memcg=test kswapd0-39 [001] ..... 240.357125: mm_vmscan_memcg_shrink_end: nr_reclaimed=53 memcg=test Signed-off-by: Dmitry Rokosov --- include/trace/events/vmscan.h | 14 ++++++++++++++ mm/vmscan.c | 11 +++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h index 9b49cd120ae9..cb39b4f0dca9 100644 --- a/include/trace/events/vmscan.h +++ b/include/trace/events/vmscan.h @@ -182,6 +182,13 @@ DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template, mm_vmscan_memcg_softlimit_r TP_ARGS(order, gfp_flags, memcg) ); +DEFINE_EVENT(mm_vmscan_memcg_reclaim_begin_template, mm_vmscan_memcg_shrink_begin, + + TP_PROTO(int order, gfp_t gfp_flags, const struct mem_cgroup *memcg), + + TP_ARGS(order, gfp_flags, memcg) +); + #endif /* CONFIG_MEMCG */ DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template, @@ -247,6 +254,13 @@ DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template, mm_vmscan_memcg_softlimit_rec TP_ARGS(nr_reclaimed, memcg) ); +DEFINE_EVENT(mm_vmscan_memcg_reclaim_end_template, mm_vmscan_memcg_shrink_end, + + TP_PROTO(unsigned long nr_reclaimed, const struct mem_cgroup *memcg), + + TP_ARGS(nr_reclaimed, memcg) +); + #endif /* CONFIG_MEMCG */ TRACE_EVENT(mm_shrink_slab_start, diff --git a/mm/vmscan.c b/mm/vmscan.c index 45780952f4b5..6d89b39d9a91 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -6461,6 +6461,12 @@ static void shrink_node_memcgs(pg_data_t *pgdat, struct scan_control *sc) */ cond_resched(); +#ifdef CONFIG_MEMCG + trace_mm_vmscan_memcg_shrink_begin(sc->order, + sc->gfp_mask, + memcg); +#endif + mem_cgroup_calculate_protection(target_memcg, memcg); if (mem_cgroup_below_min(target_memcg, memcg)) { @@ -6491,6 +6497,11 @@ static void shrink_node_memcgs(pg_data_t *pgdat, struct scan_control *sc) shrink_slab(sc->gfp_mask, pgdat->node_id, memcg, sc->priority); +#ifdef CONFIG_MEMCG + trace_mm_vmscan_memcg_shrink_end(sc->nr_reclaimed - reclaimed, + memcg); +#endif + /* Record the group's reclaim efficiency */ if (!sc->proactive) vmpressure(sc->gfp_mask, memcg, false,