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Tue, 24 Jan 2023 22:41:43 -0800 (PST) Received: from hyeyoo ([114.29.91.56]) by smtp.gmail.com with ESMTPSA id g12-20020a056a00078c00b0058837da69edsm2711319pfu.128.2023.01.24.22.41.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jan 2023 22:41:42 -0800 (PST) Date: Thu, 26 Jan 2023 00:41:15 +0900 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Michal Hocko Cc: Vlastimil Babka , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Roman Gushchin , Ingo Molnar , Johannes Weiner , Shakeel Butt , Muchun Song , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Dennis Zhou , Tejun Heo Subject: Re: [PATCH mm-unstable] lib/Kconfig.debug: do not enable DEBUG_PREEMPT by default Message-ID: References: <20230121033942.350387-1-42.hyeyoo@gmail.com> <86e68d3b-b029-5e82-5bbc-e0ccc2ae1d36@suse.cz> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="oudKfyDVtxiFA6ja" Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --oudKfyDVtxiFA6ja Content-Type: text/plain; charset=us-ascii Content-Disposition: inline From: Hyeonggon Yoo <42.hyeyoo@gmail.com> To: Michal Hocko Cc: Vlastimil Babka , Andrew Morton , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Roman Gushchin , Ingo Molnar , Johannes Weiner , Shakeel Butt , Muchun Song , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Dennis Zhou , Tejun Heo Bcc: Subject: Re: [PATCH mm-unstable] lib/Kconfig.debug: do not enable DEBUG_PREEMPT by default Reply-To: In-Reply-To: On Mon, Jan 23, 2023 at 09:58:30AM +0100, Michal Hocko wrote: > On Sat 21-01-23 20:54:15, Hyeonggon Yoo wrote: > > On Sat, Jan 21, 2023 at 12:29:44PM +0100, Vlastimil Babka wrote: > > > On 1/21/23 04:39, Hyeonggon Yoo wrote: > > > > In workloads where this_cpu operations are frequently performed, > > > > enabling DEBUG_PREEMPT may result in significant increase in > > > > runtime overhead due to frequent invocation of > > > > __this_cpu_preempt_check() function. > > > > > > > > This can be demonstrated through benchmarks such as hackbench where this > > > > configuration results in a 10% reduction in performance, primarily due to > > > > the added overhead within memcg charging path. > > > > > > > > Therefore, do not to enable DEBUG_PREEMPT by default and make users aware > > > > of its potential impact on performance in some workloads. > > > > > > > > hackbench-process-sockets > > > > debug_preempt no_debug_preempt > > > > Amean 1 0.4743 ( 0.00%) 0.4295 * 9.45%* > > > > Amean 4 1.4191 ( 0.00%) 1.2650 * 10.86%* > > > > Amean 7 2.2677 ( 0.00%) 2.0094 * 11.39%* > > > > Amean 12 3.6821 ( 0.00%) 3.2115 * 12.78%* > > > > Amean 21 6.6752 ( 0.00%) 5.7956 * 13.18%* > > > > Amean 30 9.6646 ( 0.00%) 8.5197 * 11.85%* > > > > Amean 48 15.3363 ( 0.00%) 13.5559 * 11.61%* > > > > Amean 79 24.8603 ( 0.00%) 22.0597 * 11.27%* > > > > Amean 96 30.1240 ( 0.00%) 26.8073 * 11.01%* Hello Michal, thanks for looking at this. > Do you happen to have any perf data collected during those runs? I > would be interested in the memcg side of things. Maybe we can do > something better there. Yes, below is performance data I've collected. 6.1.8-debug-preempt-dirty ========================= Overhead Command Shared Object Symbol + 9.14% hackbench [kernel.vmlinux] [k] check_preemption_disabled + 7.33% hackbench [kernel.vmlinux] [k] copy_user_enhanced_fast_string + 7.32% hackbench [kernel.vmlinux] [k] mod_objcg_state 3.55% hackbench [kernel.vmlinux] [k] refill_obj_stock 3.39% hackbench [kernel.vmlinux] [k] debug_smp_processor_id 2.97% hackbench [kernel.vmlinux] [k] memset_erms 2.55% hackbench [kernel.vmlinux] [k] __check_object_size + 2.36% hackbench [kernel.vmlinux] [k] native_queued_spin_lock_slowpath 1.76% hackbench [kernel.vmlinux] [k] unix_stream_read_generic 1.64% hackbench [kernel.vmlinux] [k] __slab_free 1.58% hackbench [kernel.vmlinux] [k] unix_stream_sendmsg 1.46% hackbench [kernel.vmlinux] [k] memcg_slab_post_alloc_hook 1.35% hackbench [kernel.vmlinux] [k] vfs_write 1.33% hackbench [kernel.vmlinux] [k] vfs_read 1.28% hackbench [kernel.vmlinux] [k] __alloc_skb 1.18% hackbench [kernel.vmlinux] [k] sock_read_iter 1.16% hackbench [kernel.vmlinux] [k] obj_cgroup_charge 1.16% hackbench [kernel.vmlinux] [k] entry_SYSCALL_64 1.14% hackbench [kernel.vmlinux] [k] sock_write_iter 1.12% hackbench [kernel.vmlinux] [k] skb_release_data 1.08% hackbench [kernel.vmlinux] [k] sock_wfree 1.07% hackbench [kernel.vmlinux] [k] cache_from_obj 0.96% hackbench [kernel.vmlinux] [k] unix_destruct_scm 0.95% hackbench [kernel.vmlinux] [k] kmem_cache_free 0.94% hackbench [kernel.vmlinux] [k] __kmem_cache_alloc_node 0.92% hackbench [kernel.vmlinux] [k] kmem_cache_alloc_node 0.89% hackbench [kernel.vmlinux] [k] _raw_spin_lock_irqsave 0.84% hackbench [kernel.vmlinux] [k] __x86_indirect_thunk_array 0.84% hackbench libc.so.6 [.] write 0.81% hackbench [kernel.vmlinux] [k] exit_to_user_mode_prepare 0.76% hackbench libc.so.6 [.] read 0.75% hackbench [kernel.vmlinux] [k] syscall_trace_enter.constprop.0 0.75% hackbench [kernel.vmlinux] [k] preempt_count_add 0.74% hackbench [kernel.vmlinux] [k] cmpxchg_double_slab.constprop.0.isra.0 0.69% hackbench [kernel.vmlinux] [k] get_partial_node 0.69% hackbench [kernel.vmlinux] [k] __virt_addr_valid 0.69% hackbench [kernel.vmlinux] [k] __rcu_read_unlock 0.65% hackbench [kernel.vmlinux] [k] get_obj_cgroup_from_current 0.63% hackbench [kernel.vmlinux] [k] __kmem_cache_free 0.62% hackbench [kernel.vmlinux] [k] entry_SYSRETQ_unsafe_stack 0.60% hackbench [kernel.vmlinux] [k] __rcu_read_lock 0.59% hackbench [kernel.vmlinux] [k] syscall_exit_to_user_mode_prepare 0.54% hackbench [kernel.vmlinux] [k] __unfreeze_partials 0.53% hackbench [kernel.vmlinux] [k] check_stack_object 0.52% hackbench [kernel.vmlinux] [k] entry_SYSCALL_64_after_hwframe 0.51% hackbench [kernel.vmlinux] [k] security_file_permission 0.50% hackbench [kernel.vmlinux] [k] __x64_sys_write 0.49% hackbench [kernel.vmlinux] [k] bpf_lsm_file_permission 0.48% hackbench [kernel.vmlinux] [k] ___slab_alloc 0.46% hackbench [kernel.vmlinux] [k] __check_heap_object and attached flamegraph-6.1.8-debug-preempt-dirty.svg. 6.1.8 (no debug preempt) ======================== Overhead Command Shared Object Symbol + 10.96% hackbench [kernel.vmlinux] [k] mod_objcg_state + 8.16% hackbench [kernel.vmlinux] [k] copy_user_enhanced_fast_string 3.29% hackbench [kernel.vmlinux] [k] memset_erms 3.07% hackbench [kernel.vmlinux] [k] __slab_free 2.89% hackbench [kernel.vmlinux] [k] refill_obj_stock 2.82% hackbench [kernel.vmlinux] [k] __check_object_size + 2.72% hackbench [kernel.vmlinux] [k] native_queued_spin_lock_slowpath 1.96% hackbench [kernel.vmlinux] [k] __x86_indirect_thunk_rax 1.88% hackbench [kernel.vmlinux] [k] memcg_slab_post_alloc_hook 1.69% hackbench [kernel.vmlinux] [k] __rcu_read_unlock 1.54% hackbench [kernel.vmlinux] [k] __alloc_skb 1.53% hackbench [kernel.vmlinux] [k] unix_stream_sendmsg 1.46% hackbench [kernel.vmlinux] [k] kmem_cache_free 1.44% hackbench [kernel.vmlinux] [k] vfs_write 1.43% hackbench [kernel.vmlinux] [k] vfs_read 1.33% hackbench [kernel.vmlinux] [k] unix_stream_read_generic 1.31% hackbench [kernel.vmlinux] [k] sock_write_iter 1.27% hackbench [kernel.vmlinux] [k] kmalloc_slab 1.22% hackbench [kernel.vmlinux] [k] __rcu_read_lock 1.20% hackbench [kernel.vmlinux] [k] sock_read_iter 1.18% hackbench [kernel.vmlinux] [k] __entry_text_start 1.15% hackbench [kernel.vmlinux] [k] kmem_cache_alloc_node 1.12% hackbench [kernel.vmlinux] [k] unix_stream_recvmsg 1.10% hackbench [kernel.vmlinux] [k] obj_cgroup_charge 0.98% hackbench [kernel.vmlinux] [k] __kmem_cache_alloc_node 0.97% hackbench libc.so.6 [.] write 0.91% hackbench [kernel.vmlinux] [k] exit_to_user_mode_prepare 0.88% hackbench [kernel.vmlinux] [k] __kmem_cache_free 0.87% hackbench [kernel.vmlinux] [k] syscall_trace_enter.constprop.0 0.86% hackbench [kernel.vmlinux] [k] __kmalloc_node_track_caller 0.84% hackbench libc.so.6 [.] read 0.81% hackbench [kernel.vmlinux] [k] __lock_text_start 0.80% hackbench [kernel.vmlinux] [k] cache_from_obj 0.74% hackbench [kernel.vmlinux] [k] get_obj_cgroup_from_current 0.73% hackbench [kernel.vmlinux] [k] entry_SYSRETQ_unsafe_stack 0.72% hackbench [kernel.vmlinux] [k] unix_destruct_scm 0.70% hackbench [kernel.vmlinux] [k] get_partial_node 0.69% hackbench [kernel.vmlinux] [k] syscall_exit_to_user_mode_prepare 0.65% hackbench [kernel.vmlinux] [k] kfree 0.63% hackbench [kernel.vmlinux] [k] __unfreeze_partials 0.60% hackbench [kernel.vmlinux] [k] cmpxchg_double_slab.constprop.0.isra.0 0.58% hackbench [kernel.vmlinux] [k] skb_release_data 0.56% hackbench [kernel.vmlinux] [k] __virt_addr_valid 0.56% hackbench [kernel.vmlinux] [k] entry_SYSCALL_64_after_hwframe 0.56% hackbench [kernel.vmlinux] [k] __check_heap_object 0.55% hackbench [kernel.vmlinux] [k] sock_wfree 0.54% hackbench [kernel.vmlinux] [k] __audit_syscall_entry 0.53% hackbench [kernel.vmlinux] [k] ___slab_alloc 0.53% hackbench [kernel.vmlinux] [k] check_stack_object 0.52% hackbench [kernel.vmlinux] [k] bpf_lsm_file_permission and attached flamegraph-6.1.8.svg. 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fill=3D"rgb(243,156= ,24)" rx=3D"2" ry=3D"2" />=0A=0A= =0A=0Asock_read_iter (3,462,357,602,934 samples, 43.09%)= =0Asock_read_it= er=0A=0A=0A__rcu_read_unlock (4,889,710,082 samples, = 0.06%)=0A=0A=0A=0A__rcu_read_lock (2,140,548,424 samples, 0.0= 3%)=0A=0A=0A=0Acheck_preemption_disabled (2,667,105,877 sa= mples, 0.03%)=0A=0A=0A=0Ado_syscall_64 (3,665,861,404,744= samples, 45.62%)=0Ado_syscall_64=0A=0A=0Aenqueue_task (4,= 395,000,992 samples, 0.05%)=0A=0A=0A=0A__rcu_read_lock (2,1= 41,707,748 samples, 0.03%)=0A=0A=0A=0Asecondary_startup_64_n= o_verify (2,065,092,133 samples, 0.03%)=0A=0A=0A=0Amaybe_= add_creds (13,744,692,174 samples, 0.17%)=0A=0A=0A=0Anewidle= _balance (1,935,774,463 samples, 0.02%)= =0A=0A=0A=0Acgroup_r= stat_updated (2,220,372,679 samples, 0.03%)=0A=0A=0A=0Aobj_cgr= oup_uncharge_pages (17,951,844,287 samples, 0.22%)=0A=0A=0A=0A__get_user_8 (1,914,018,974 samples, 0.02%)=0A=0A=0A=0Apreempt_count_add (8,443,831,331 samples, 0.11%)=0A=0A=0A=0Apsi_group_change (3,262,094,103 samples, 0.04%)=0A=0A=0A=0A__update_load_avg_cfs_rq (2,184,804,238 samples, 0.03%)=0A=0A=0A=0Aswitch_mm_irqs_off (2,195,031,131 samples, 0.03%)=0A=0A=0A<= g >=0Aget_partial_node (85,275,559,709 samples, 1.06%)=0A=0A= =0A=0A__cond_resched (3,232,307,243 samples, 0.04%)=0A=0A= =0A=0A__x86_indirect_thunk_array (1,086,324,146 samples, 0.01%)<= /title><rect x=3D"740.7" y=3D"197" width=3D"0.1" height=3D"15.0" fill=3D"rg= b(235,224,0)" rx=3D"2" ry=3D"2" />=0A<text x=3D"743.68" y=3D"207.5" ></tex= t>=0A</g>=0A<g >=0A<title>schedule (26,234,945,696 samples, 0.33%)<= rect x=3D"1115.3" y=3D"197" width=3D"3.8" height=3D"15.0" fill=3D"rgb(245,2= 25,40)" rx=3D"2" ry=3D"2" />=0A=0A= =0A=0Asimple_copy_to_iter (285,573,561,935 samples, 3.55%)</= title><rect x=3D"543.2" y=3D"181" width=3D"42.0" height=3D"15.0" fill=3D"rg= b(218,18,35)" rx=3D"2" ry=3D"2" />=0A<text x=3D"546.24" y=3D"191.5" >sim..= </text>=0A</g>=0A<g >=0A<title>unix_write_space (49,400,352,742 samples, 0.= 61%)=0A=0A=0A=0Aset_next_buddy (1,409,918,961 samples, 0.02= %)=0A=0A=0A=0Attwu_do_activate (13,656,667,117 samples, = 0.17%)=0A= =0A=0A=0Anative_sched_clock (1,276,525,079 samples, 0= =2E02%)=0A=0A=0A=0A__switch_to_asm (7,202,763,481 samples, = 0.09%)=0A=0A=0A=0Amemset_erms (152,119,556,134 samples,= 1.89%)=0Am..=0A=0A=0A__mod_memcg_lruvec_state (8,573,144,1= 80 samples, 0.11%)=0A=0A=0A=0A_raw_spin_lock (956,343,675 s= amples, 0.01%)=0A=0A=0A=0A__mod_memcg_state (11,920,801,3= 16 samples, 0.15%)=0A=0A=0A=0Akfree_skbmem (4,956,692,932 = samples, 0.06%)=0A=0A=0A=0Aupdate_curr (3,263,002,931 sampl= es, 0.04%)=0A=0A=0A=0A__calc_delta (2,591,075,388 samples, = 0.03%)=0A=0A=0A=0Aswitch_mm_irqs_off (684,862,063 samples, 0= =2E01%)=0A=0A=0A=0Aautoremove_wake_function (135,008,262= ,096 samples, 1.68%)=0A=0A=0A=0Aenqueue_task (17,811,815,= 795 samples, 0.22%)=0A=0A=0A=0Acpuidle_enter_state (974= ,711,438 samples, 0.01%)=0A=0A=0A=0Acheck_preempt_wakeup = (8,439,729,545 samples, 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