From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267585AbUHMU1s (ORCPT ); Fri, 13 Aug 2004 16:27:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267357AbUHMUZ1 (ORCPT ); Fri, 13 Aug 2004 16:25:27 -0400 Received: from mustang.oldcity.dca.net ([216.158.38.3]:15554 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S267502AbUHMUSS (ORCPT ); Fri, 13 Aug 2004 16:18:18 -0400 Subject: Re: [patch] voluntary-preempt-2.6.8-rc4-O7 From: Lee Revell To: Ingo Molnar Cc: linux-kernel , Felipe Alfaro Solana , Florian Schmidt In-Reply-To: <20040813104817.GI8135@elte.hu> References: <20040726083537.GA24948@elte.hu> <1090832436.6936.105.camel@mindpipe> <20040726124059.GA14005@elte.hu> <20040726204720.GA26561@elte.hu> <20040729222657.GA10449@elte.hu> <20040801193043.GA20277@elte.hu> <20040809104649.GA13299@elte.hu> <20040810132654.GA28915@elte.hu> <20040812235116.GA27838@elte.hu> <1092382825.3450.19.camel@mindpipe> <20040813104817.GI8135@elte.hu> Content-Type: text/plain Message-Id: <1092428329.3450.71.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Fri, 13 Aug 2004 16:18:50 -0400 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2004-08-13 at 06:48, Ingo Molnar wrote: > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc4-O7 > Here's another very common one. I am not sure this one is a problem, but possibly points to areas where the VM (or XFree86) could be improved. preemption latency trace v1.0 ----------------------------- latency: 166 us, entries: 305 (305) process: XFree86/478, uid: 0 nice: 0, policy: 0, rt_priority: 0 =======> 0.000ms (+0.000ms): unmap_page_range (unmap_vmas) 0.000ms (+0.000ms): zap_pmd_range (unmap_page_range) 0.000ms (+0.000ms): zap_pte_range (zap_pmd_range) 0.002ms (+0.001ms): set_page_dirty (zap_pte_range) 0.003ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.003ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.004ms (+0.000ms): __page_cache_release (zap_pte_range) 0.005ms (+0.001ms): free_hot_page (zap_pte_range) 0.005ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.006ms (+0.001ms): set_page_dirty (zap_pte_range) 0.007ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.007ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.007ms (+0.000ms): __page_cache_release (zap_pte_range) 0.008ms (+0.000ms): free_hot_page (zap_pte_range) 0.008ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.009ms (+0.000ms): set_page_dirty (zap_pte_range) 0.009ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.010ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.010ms (+0.000ms): __page_cache_release (zap_pte_range) 0.011ms (+0.000ms): free_hot_page (zap_pte_range) 0.011ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.012ms (+0.000ms): set_page_dirty (zap_pte_range) 0.012ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.013ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.013ms (+0.000ms): __page_cache_release (zap_pte_range) 0.014ms (+0.000ms): free_hot_page (zap_pte_range) 0.014ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.015ms (+0.000ms): set_page_dirty (zap_pte_range) 0.015ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.016ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.016ms (+0.000ms): __page_cache_release (zap_pte_range) 0.016ms (+0.000ms): free_hot_page (zap_pte_range) 0.017ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.017ms (+0.000ms): set_page_dirty (zap_pte_range) 0.018ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.018ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.019ms (+0.000ms): __page_cache_release (zap_pte_range) 0.019ms (+0.000ms): free_hot_page (zap_pte_range) 0.019ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.020ms (+0.000ms): set_page_dirty (zap_pte_range) 0.021ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.021ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.021ms (+0.000ms): __page_cache_release (zap_pte_range) 0.022ms (+0.000ms): free_hot_page (zap_pte_range) 0.022ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.023ms (+0.000ms): free_pages_bulk (free_hot_cold_page) 0.037ms (+0.014ms): do_IRQ (common_interrupt) 0.038ms (+0.000ms): mask_and_ack_8259A (do_IRQ) 0.041ms (+0.003ms): generic_redirect_hardirq (do_IRQ) 0.042ms (+0.000ms): generic_handle_IRQ_event (do_IRQ) 0.042ms (+0.000ms): timer_interrupt (generic_handle_IRQ_event) 0.043ms (+0.000ms): mark_offset_tsc (timer_interrupt) 0.048ms (+0.005ms): do_timer (timer_interrupt) 0.049ms (+0.000ms): update_process_times (do_timer) 0.049ms (+0.000ms): update_one_process (update_process_times) 0.050ms (+0.000ms): run_local_timers (update_process_times) 0.050ms (+0.000ms): raise_softirq (update_process_times) 0.050ms (+0.000ms): scheduler_tick (update_process_times) 0.051ms (+0.000ms): sched_clock (scheduler_tick) 0.052ms (+0.001ms): task_timeslice (scheduler_tick) 0.052ms (+0.000ms): update_wall_time (do_timer) 0.052ms (+0.000ms): update_wall_time_one_tick (update_wall_time) 0.053ms (+0.000ms): generic_note_interrupt (do_IRQ) 0.053ms (+0.000ms): end_8259A_irq (do_IRQ) 0.054ms (+0.000ms): enable_8259A_irq (do_IRQ) 0.055ms (+0.001ms): do_softirq (do_IRQ) 0.055ms (+0.000ms): __do_softirq (do_softirq) 0.056ms (+0.000ms): wake_up_process (do_softirq) 0.056ms (+0.000ms): try_to_wake_up (wake_up_process) 0.056ms (+0.000ms): task_rq_lock (try_to_wake_up) 0.057ms (+0.000ms): activate_task (try_to_wake_up) 0.057ms (+0.000ms): sched_clock (activate_task) 0.058ms (+0.000ms): recalc_task_prio (activate_task) 0.058ms (+0.000ms): effective_prio (recalc_task_prio) 0.058ms (+0.000ms): enqueue_task (activate_task) 0.059ms (+0.000ms): preempt_schedule (try_to_wake_up) 0.060ms (+0.000ms): preempt_schedule (zap_pte_range) 0.060ms (+0.000ms): set_page_dirty (zap_pte_range) 0.060ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.061ms (+0.000ms): preempt_schedule (zap_pte_range) 0.061ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.061ms (+0.000ms): __page_cache_release (zap_pte_range) 0.062ms (+0.000ms): preempt_schedule (__page_cache_release) 0.062ms (+0.000ms): free_hot_page (zap_pte_range) 0.063ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.063ms (+0.000ms): preempt_schedule (zap_pte_range) 0.064ms (+0.000ms): set_page_dirty (zap_pte_range) 0.064ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.064ms (+0.000ms): preempt_schedule (zap_pte_range) 0.065ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.065ms (+0.000ms): __page_cache_release (zap_pte_range) 0.066ms (+0.000ms): preempt_schedule (__page_cache_release) 0.066ms (+0.000ms): free_hot_page (zap_pte_range) 0.066ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.067ms (+0.000ms): preempt_schedule (zap_pte_range) 0.067ms (+0.000ms): set_page_dirty (zap_pte_range) 0.068ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.068ms (+0.000ms): preempt_schedule (zap_pte_range) 0.068ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.069ms (+0.000ms): __page_cache_release (zap_pte_range) 0.069ms (+0.000ms): preempt_schedule (__page_cache_release) 0.070ms (+0.000ms): free_hot_page (zap_pte_range) 0.070ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.071ms (+0.000ms): preempt_schedule (zap_pte_range) 0.071ms (+0.000ms): set_page_dirty (zap_pte_range) 0.071ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.072ms (+0.000ms): preempt_schedule (zap_pte_range) 0.072ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.072ms (+0.000ms): __page_cache_release (zap_pte_range) 0.073ms (+0.000ms): preempt_schedule (__page_cache_release) 0.073ms (+0.000ms): free_hot_page (zap_pte_range) 0.073ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.074ms (+0.000ms): preempt_schedule (zap_pte_range) 0.074ms (+0.000ms): set_page_dirty (zap_pte_range) 0.075ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.075ms (+0.000ms): preempt_schedule (zap_pte_range) 0.075ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.076ms (+0.000ms): __page_cache_release (zap_pte_range) 0.076ms (+0.000ms): preempt_schedule (__page_cache_release) 0.077ms (+0.000ms): free_hot_page (zap_pte_range) 0.077ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.078ms (+0.000ms): preempt_schedule (zap_pte_range) 0.078ms (+0.000ms): set_page_dirty (zap_pte_range) 0.078ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.079ms (+0.000ms): preempt_schedule (zap_pte_range) 0.079ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.079ms (+0.000ms): __page_cache_release (zap_pte_range) 0.080ms (+0.000ms): preempt_schedule (__page_cache_release) 0.080ms (+0.000ms): free_hot_page (zap_pte_range) 0.081ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.081ms (+0.000ms): preempt_schedule (zap_pte_range) 0.082ms (+0.000ms): set_page_dirty (zap_pte_range) 0.082ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.082ms (+0.000ms): preempt_schedule (zap_pte_range) 0.083ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.083ms (+0.000ms): __page_cache_release (zap_pte_range) 0.084ms (+0.000ms): preempt_schedule (__page_cache_release) 0.084ms (+0.000ms): free_hot_page (zap_pte_range) 0.084ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.085ms (+0.000ms): preempt_schedule (zap_pte_range) 0.085ms (+0.000ms): set_page_dirty (zap_pte_range) 0.086ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.086ms (+0.000ms): preempt_schedule (zap_pte_range) 0.086ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.087ms (+0.000ms): __page_cache_release (zap_pte_range) 0.087ms (+0.000ms): preempt_schedule (__page_cache_release) 0.088ms (+0.000ms): free_hot_page (zap_pte_range) 0.088ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.088ms (+0.000ms): preempt_schedule (zap_pte_range) 0.089ms (+0.000ms): set_page_dirty (zap_pte_range) 0.089ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.090ms (+0.000ms): preempt_schedule (zap_pte_range) 0.090ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.090ms (+0.000ms): __page_cache_release (zap_pte_range) 0.091ms (+0.000ms): preempt_schedule (__page_cache_release) 0.091ms (+0.000ms): free_hot_page (zap_pte_range) 0.091ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.092ms (+0.000ms): preempt_schedule (zap_pte_range) 0.092ms (+0.000ms): set_page_dirty (zap_pte_range) 0.093ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.093ms (+0.000ms): preempt_schedule (zap_pte_range) 0.093ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.094ms (+0.000ms): __page_cache_release (zap_pte_range) 0.094ms (+0.000ms): preempt_schedule (__page_cache_release) 0.095ms (+0.000ms): free_hot_page (zap_pte_range) 0.095ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.096ms (+0.000ms): preempt_schedule (zap_pte_range) 0.096ms (+0.000ms): set_page_dirty (zap_pte_range) 0.096ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.097ms (+0.000ms): preempt_schedule (zap_pte_range) 0.097ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.097ms (+0.000ms): __page_cache_release (zap_pte_range) 0.098ms (+0.000ms): preempt_schedule (__page_cache_release) 0.098ms (+0.000ms): free_hot_page (zap_pte_range) 0.099ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.099ms (+0.000ms): preempt_schedule (zap_pte_range) 0.100ms (+0.000ms): set_page_dirty (zap_pte_range) 0.100ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.100ms (+0.000ms): preempt_schedule (zap_pte_range) 0.101ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.101ms (+0.000ms): __page_cache_release (zap_pte_range) 0.102ms (+0.000ms): preempt_schedule (__page_cache_release) 0.102ms (+0.000ms): free_hot_page (zap_pte_range) 0.102ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.103ms (+0.000ms): preempt_schedule (zap_pte_range) 0.103ms (+0.000ms): set_page_dirty (zap_pte_range) 0.104ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.104ms (+0.000ms): preempt_schedule (zap_pte_range) 0.104ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.105ms (+0.000ms): __page_cache_release (zap_pte_range) 0.105ms (+0.000ms): preempt_schedule (__page_cache_release) 0.106ms (+0.000ms): free_hot_page (zap_pte_range) 0.106ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.106ms (+0.000ms): preempt_schedule (zap_pte_range) 0.107ms (+0.000ms): set_page_dirty (zap_pte_range) 0.107ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.108ms (+0.000ms): preempt_schedule (zap_pte_range) 0.108ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.108ms (+0.000ms): __page_cache_release (zap_pte_range) 0.109ms (+0.000ms): preempt_schedule (__page_cache_release) 0.109ms (+0.000ms): free_hot_page (zap_pte_range) 0.110ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.110ms (+0.000ms): preempt_schedule (zap_pte_range) 0.110ms (+0.000ms): set_page_dirty (zap_pte_range) 0.111ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.111ms (+0.000ms): preempt_schedule (zap_pte_range) 0.111ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.112ms (+0.000ms): __page_cache_release (zap_pte_range) 0.112ms (+0.000ms): preempt_schedule (__page_cache_release) 0.113ms (+0.000ms): free_hot_page (zap_pte_range) 0.113ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.114ms (+0.000ms): preempt_schedule (zap_pte_range) 0.114ms (+0.000ms): set_page_dirty (zap_pte_range) 0.114ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.115ms (+0.000ms): preempt_schedule (zap_pte_range) 0.115ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.115ms (+0.000ms): __page_cache_release (zap_pte_range) 0.116ms (+0.000ms): preempt_schedule (__page_cache_release) 0.116ms (+0.000ms): free_hot_page (zap_pte_range) 0.117ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.117ms (+0.000ms): free_pages_bulk (free_hot_cold_page) 0.128ms (+0.011ms): preempt_schedule (free_pages_bulk) 0.129ms (+0.000ms): preempt_schedule (zap_pte_range) 0.129ms (+0.000ms): set_page_dirty (zap_pte_range) 0.130ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.130ms (+0.000ms): preempt_schedule (zap_pte_range) 0.130ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.131ms (+0.000ms): __page_cache_release (zap_pte_range) 0.131ms (+0.000ms): preempt_schedule (__page_cache_release) 0.132ms (+0.000ms): free_hot_page (zap_pte_range) 0.132ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.132ms (+0.000ms): preempt_schedule (zap_pte_range) 0.133ms (+0.000ms): set_page_dirty (zap_pte_range) 0.133ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.134ms (+0.000ms): preempt_schedule (zap_pte_range) 0.134ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.134ms (+0.000ms): __page_cache_release (zap_pte_range) 0.135ms (+0.000ms): preempt_schedule (__page_cache_release) 0.135ms (+0.000ms): free_hot_page (zap_pte_range) 0.135ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.136ms (+0.000ms): preempt_schedule (zap_pte_range) 0.136ms (+0.000ms): set_page_dirty (zap_pte_range) 0.137ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.137ms (+0.000ms): preempt_schedule (zap_pte_range) 0.137ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.138ms (+0.000ms): __page_cache_release (zap_pte_range) 0.138ms (+0.000ms): preempt_schedule (__page_cache_release) 0.139ms (+0.000ms): free_hot_page (zap_pte_range) 0.139ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.139ms (+0.000ms): preempt_schedule (zap_pte_range) 0.140ms (+0.000ms): set_page_dirty (zap_pte_range) 0.140ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.141ms (+0.000ms): preempt_schedule (zap_pte_range) 0.141ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.141ms (+0.000ms): __page_cache_release (zap_pte_range) 0.142ms (+0.000ms): preempt_schedule (__page_cache_release) 0.142ms (+0.000ms): free_hot_page (zap_pte_range) 0.142ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.143ms (+0.000ms): preempt_schedule (zap_pte_range) 0.144ms (+0.000ms): set_page_dirty (zap_pte_range) 0.144ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.145ms (+0.000ms): preempt_schedule (zap_pte_range) 0.145ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.145ms (+0.000ms): __page_cache_release (zap_pte_range) 0.146ms (+0.000ms): preempt_schedule (__page_cache_release) 0.146ms (+0.000ms): free_hot_page (zap_pte_range) 0.146ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.147ms (+0.000ms): preempt_schedule (zap_pte_range) 0.147ms (+0.000ms): set_page_dirty (zap_pte_range) 0.148ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.148ms (+0.000ms): preempt_schedule (zap_pte_range) 0.148ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.149ms (+0.000ms): __page_cache_release (zap_pte_range) 0.149ms (+0.000ms): preempt_schedule (__page_cache_release) 0.149ms (+0.000ms): free_hot_page (zap_pte_range) 0.150ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.150ms (+0.000ms): preempt_schedule (zap_pte_range) 0.151ms (+0.000ms): set_page_dirty (zap_pte_range) 0.151ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.152ms (+0.000ms): preempt_schedule (zap_pte_range) 0.152ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.152ms (+0.000ms): __page_cache_release (zap_pte_range) 0.153ms (+0.000ms): preempt_schedule (__page_cache_release) 0.153ms (+0.000ms): free_hot_page (zap_pte_range) 0.153ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.154ms (+0.000ms): preempt_schedule (zap_pte_range) 0.154ms (+0.000ms): set_page_dirty (zap_pte_range) 0.155ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.155ms (+0.000ms): preempt_schedule (zap_pte_range) 0.155ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.155ms (+0.000ms): __page_cache_release (zap_pte_range) 0.156ms (+0.000ms): preempt_schedule (__page_cache_release) 0.156ms (+0.000ms): free_hot_page (zap_pte_range) 0.157ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.157ms (+0.000ms): preempt_schedule (zap_pte_range) 0.158ms (+0.000ms): set_page_dirty (zap_pte_range) 0.158ms (+0.000ms): page_remove_rmap (zap_pte_range) 0.159ms (+0.000ms): preempt_schedule (zap_pte_range) 0.159ms (+0.000ms): free_page_and_swap_cache (zap_pte_range) 0.159ms (+0.000ms): __page_cache_release (zap_pte_range) 0.160ms (+0.000ms): preempt_schedule (__page_cache_release) 0.160ms (+0.000ms): free_hot_page (zap_pte_range) 0.160ms (+0.000ms): free_hot_cold_page (zap_pte_range) 0.161ms (+0.000ms): preempt_schedule (zap_pte_range) 0.161ms (+0.000ms): check_preempt_timing (touch_preempt_timing)