From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0F51C433DF for ; Mon, 3 Aug 2020 16:14:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CA50820738 for ; Mon, 3 Aug 2020 16:14:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="fv1qL/3g" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728470AbgHCQO3 (ORCPT ); Mon, 3 Aug 2020 12:14:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726489AbgHCQO2 (ORCPT ); Mon, 3 Aug 2020 12:14:28 -0400 Received: from mail-ej1-x641.google.com (mail-ej1-x641.google.com [IPv6:2a00:1450:4864:20::641]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32F52C06174A for ; Mon, 3 Aug 2020 09:14:28 -0700 (PDT) Received: by mail-ej1-x641.google.com with SMTP id kq25so26273086ejb.3 for ; Mon, 03 Aug 2020 09:14:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=tSBpQmpuiewbS5z6Oz2e+wP+GlWYteCnkz9IfbL1iAw=; b=fv1qL/3gxwgjph8hqIFsTsj2c5q6kMAx3FOxZkVD2XctB9LQxrQI6xNVaWRdun/Inb oHT2YEDBC7kfcQ9qgDe3PTlY2gxHaKUKzjlA5dBBt1X9TYZfoIwoS+BUItvw05uh9OxM F1bJTlNhLLecvhIyzdHzgIIV6jVRW22mXYwtkGXGj2a9S3Z6WKfs4ED1sktjfbZOohLB kLCGPnmSuZ3CgTQqqNGROxrDxrQmumJ07UMBVowJdqbCV7K5N+nAuF9V/VD2y6DkMD3P cxXof+33OVGiA3bUBp62YHZPlPmEHRAOmppBe7qDux6mks6AG/mgvcMyht0RqG2kPy6n CWNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=tSBpQmpuiewbS5z6Oz2e+wP+GlWYteCnkz9IfbL1iAw=; b=V8fqV2RyGPPRKBSLXoc5JOscoKPjlpMGNAoXBSStN+g7DYcUvZSNr8hQTE8+JjWDEj 4dEaDCBJJdKb5bQEGP3OoTiw0llTZMkIkAbvj/HKihbWOIWvBIUmvVXRcSCl9p9hbISp NvzU8Tr7jWQyPU15wrmJid9Q8aAQOjEvEN0UUZth7nezqAJZ4ORBYloKMPxFNJWCk2yT GTjWWmUROaGgtTCRn8ypAXi9+mYDdMDmsdmNORkJicv7pRifV97yU45R6LCtzBGi8kqA RaIhgRF13qd8sRZAupVYO8zNvejyLjI0b2FoP1NSXgav9zbYD+SC1wb9FKula8HCswKU 33yQ== X-Gm-Message-State: AOAM53218RGhQTZcByTsUg/O0zavHmrAXGEhzM7rHucLUs9GfzHXZiX4 RCQoKq83bNSuDiLdZA17eR8= X-Google-Smtp-Source: ABdhPJxyZYxI7TYLkV2fkj5SRAFRT2Mkp7kQi+j94kRyxCt3fSDOBjn0CJ/tBX1fOHlBmjQFdyw9iQ== X-Received: by 2002:a17:906:1c56:: with SMTP id l22mr17063449ejg.84.1596471266894; Mon, 03 Aug 2020 09:14:26 -0700 (PDT) Received: from skbuf ([188.26.57.97]) by smtp.gmail.com with ESMTPSA id m24sm16291795eje.80.2020.08.03.09.14.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2020 09:14:26 -0700 (PDT) Date: Mon, 3 Aug 2020 19:14:23 +0300 From: Vladimir Oltean To: Valentin Schneider Cc: Thomas Gleixner , Kurt Kanzenbach , Alison Wang , catalin.marinas@arm.com, will@kernel.org, paulmck@kernel.org, mw@semihalf.com, leoyang.li@nxp.com, vladimir.oltean@nxp.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Anna-Maria Gleixner , Peter Zijlstra Subject: Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting Message-ID: <20200803161423.fin6365nw5sza4ns@skbuf> References: <20200729033934.22349-1-alison.wang@nxp.com> <877dumbtoi.fsf@kurt> <20200729094943.lsmhsqlnl7rlnl6f@skbuf> <87mu3ho48v.fsf@kurt> <20200730082228.r24zgdeiofvwxijm@skbuf> <873654m9zi.fsf@kurt> <87lfiwm2bj.fsf@nanos.tec.linutronix.de> <20200803114112.mrcuupz4ir5uqlp6@skbuf> <87d047n4oh.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 03, 2020 at 04:47:03PM +0100, Valentin Schneider wrote: > > On 03/08/20 16:13, Thomas Gleixner wrote: > > Vladimir Oltean writes: > >>> 1) When irq accounting is disabled, RT throttling kicks in as > >>> expected. > >>> > >>> 2) With irq accounting the RT throttler does not kick in and the RCU > >>> stall/lockups happen. > >> What is this telling us? > > > > It seems that the fine grained irq time accounting affects the runtime > > accounting in some way which I haven't figured out yet. > > > > With IRQ_TIME_ACCOUNTING, rq_clock_task() will always be incremented by a > lesser-or-equal value than when not having the option; you start with the > same delta_exec but slice some for the IRQ accounting, and leave the rest > for the rq_clock_task() (+paravirt). > > IIUC this means that if you spend e.g. 10% of the time in IRQ and 90% of > the time running the stress-ng RT tasks, despite having RT tasks hogging > the entirety of the "available time" it is still only 90% runtime, which is > below the 95% default and the throttling doesn't happen. > > I don't know if considering IRQ time in some way or another in > sched_rt_runtime_exceeded() really is a way out here. > > > Thanks, > > > > tglx > Not sure it this is relevant at all to the conversation we're having (sorry if it isn't), but FWIW, on my armv7 board, enabling CONFIG_IRQ_TIME_ACCOUNTING makes it completely unable to boot (the log below is just earlyprintk): Starting kernel ... [ 0.000000] Booting Linux on physical CPU 0xf00 [ 0.000000] Linux version 5.8.0-rc7-02154-g1a0b51626a14-dirty (tigrisor@skbuf) (arm-linux-gnueabihf-gcc (Linaro GCC 7.3-2018.05) 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701], GNU ld (Linaro_Binutils-2018.05) 2.28.2.20170706) #383 SMP Mon Aug 3 19:03:50 EEST 2020 [ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: NXP LS1021A-TSN Board [ 0.000000] earlycon: uart8250 at MMIO 0x021c0500 (options '') [ 0.000000] printk: bootconsole [uart8250] enabled [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] efi: UEFI not found. [ 0.000000] Ignoring RAM at 0xb0000000-0xc0000000 [ 0.000000] Consider using a HIGHMEM enabled kernel. [ 0.000000] cma: Reserved 64 MiB at 0xac000000 [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x0000000080000000-0x00000000afffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000080000000-0x00000000afffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000000afffffff] [ 0.000000] percpu: Embedded 20 pages/cpu s51660 r8192 d22068 u81920 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 194880 [ 0.000000] Kernel command line: console=ttyS0,115200 earlycon=uart8250,mmio,0x21c0500 root=/dev/mmcblk0p2 rootwait rw [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear) [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off [ 0.000000] Memory: 687944K/786432K available (12288K kernel code, 1026K rwdata, 6980K rodata, 1024K init, 279K bss, 32952K reserved, 65536K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] rcu: Hierarchical RCU implementation. [ 0.000000] rcu: RCU event tracing is enabled. [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=2. [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 [ 0.000000] random: get_random_bytes called from start_kernel+0x36c/0x54c with crng_init=0 [ 0.000000] timer_probe: no matching timers found [ 0.000000] Console: colour dummy device 80x30 [ 0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns Thanks, -Vladimir From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9B9B1C433DF for ; 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Mon, 03 Aug 2020 09:14:26 -0700 (PDT) Received: from skbuf ([188.26.57.97]) by smtp.gmail.com with ESMTPSA id m24sm16291795eje.80.2020.08.03.09.14.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2020 09:14:26 -0700 (PDT) Date: Mon, 3 Aug 2020 19:14:23 +0300 From: Vladimir Oltean To: Valentin Schneider Subject: Re: [RFC PATCH] arm64: defconfig: Disable fine-grained task level IRQ time accounting Message-ID: <20200803161423.fin6365nw5sza4ns@skbuf> References: <20200729033934.22349-1-alison.wang@nxp.com> <877dumbtoi.fsf@kurt> <20200729094943.lsmhsqlnl7rlnl6f@skbuf> <87mu3ho48v.fsf@kurt> <20200730082228.r24zgdeiofvwxijm@skbuf> <873654m9zi.fsf@kurt> <87lfiwm2bj.fsf@nanos.tec.linutronix.de> <20200803114112.mrcuupz4ir5uqlp6@skbuf> <87d047n4oh.fsf@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200803_121428_288552_CBAF7A86 X-CRM114-Status: GOOD ( 22.92 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: paulmck@kernel.org, Anna-Maria Gleixner , catalin.marinas@arm.com, Alison Wang , linux-kernel@vger.kernel.org, leoyang.li@nxp.com, Peter Zijlstra , vladimir.oltean@nxp.com, Kurt Kanzenbach , Thomas Gleixner , mw@semihalf.com, will@kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Aug 03, 2020 at 04:47:03PM +0100, Valentin Schneider wrote: > > On 03/08/20 16:13, Thomas Gleixner wrote: > > Vladimir Oltean writes: > >>> 1) When irq accounting is disabled, RT throttling kicks in as > >>> expected. > >>> > >>> 2) With irq accounting the RT throttler does not kick in and the RCU > >>> stall/lockups happen. > >> What is this telling us? > > > > It seems that the fine grained irq time accounting affects the runtime > > accounting in some way which I haven't figured out yet. > > > > With IRQ_TIME_ACCOUNTING, rq_clock_task() will always be incremented by a > lesser-or-equal value than when not having the option; you start with the > same delta_exec but slice some for the IRQ accounting, and leave the rest > for the rq_clock_task() (+paravirt). > > IIUC this means that if you spend e.g. 10% of the time in IRQ and 90% of > the time running the stress-ng RT tasks, despite having RT tasks hogging > the entirety of the "available time" it is still only 90% runtime, which is > below the 95% default and the throttling doesn't happen. > > I don't know if considering IRQ time in some way or another in > sched_rt_runtime_exceeded() really is a way out here. > > > Thanks, > > > > tglx > Not sure it this is relevant at all to the conversation we're having (sorry if it isn't), but FWIW, on my armv7 board, enabling CONFIG_IRQ_TIME_ACCOUNTING makes it completely unable to boot (the log below is just earlyprintk): Starting kernel ... [ 0.000000] Booting Linux on physical CPU 0xf00 [ 0.000000] Linux version 5.8.0-rc7-02154-g1a0b51626a14-dirty (tigrisor@skbuf) (arm-linux-gnueabihf-gcc (Linaro GCC 7.3-2018.05) 7.3.1 20180425 [linaro-7.3-2018.05 revision d29120a424ecfbc167ef90065c0eeb7f91977701], GNU ld (Linaro_Binutils-2018.05) 2.28.2.20170706) #383 SMP Mon Aug 3 19:03:50 EEST 2020 [ 0.000000] CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d [ 0.000000] CPU: div instructions available: patching division code [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] OF: fdt: Machine model: NXP LS1021A-TSN Board [ 0.000000] earlycon: uart8250 at MMIO 0x021c0500 (options '') [ 0.000000] printk: bootconsole [uart8250] enabled [ 0.000000] Memory policy: Data cache writealloc [ 0.000000] efi: UEFI not found. [ 0.000000] Ignoring RAM at 0xb0000000-0xc0000000 [ 0.000000] Consider using a HIGHMEM enabled kernel. [ 0.000000] cma: Reserved 64 MiB at 0xac000000 [ 0.000000] Zone ranges: [ 0.000000] Normal [mem 0x0000000080000000-0x00000000afffffff] [ 0.000000] Movable zone start for each node [ 0.000000] Early memory node ranges [ 0.000000] node 0: [mem 0x0000000080000000-0x00000000afffffff] [ 0.000000] Initmem setup node 0 [mem 0x0000000080000000-0x00000000afffffff] [ 0.000000] percpu: Embedded 20 pages/cpu s51660 r8192 d22068 u81920 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 194880 [ 0.000000] Kernel command line: console=ttyS0,115200 earlycon=uart8250,mmio,0x21c0500 root=/dev/mmcblk0p2 rootwait rw [ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear) [ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear) [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off [ 0.000000] Memory: 687944K/786432K available (12288K kernel code, 1026K rwdata, 6980K rodata, 1024K init, 279K bss, 32952K reserved, 65536K cma-reserved) [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1 [ 0.000000] rcu: Hierarchical RCU implementation. [ 0.000000] rcu: RCU event tracing is enabled. [ 0.000000] rcu: RCU restricting CPUs from NR_CPUS=16 to nr_cpu_ids=2. [ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies. [ 0.000000] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2 [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16 [ 0.000000] random: get_random_bytes called from start_kernel+0x36c/0x54c with crng_init=0 [ 0.000000] timer_probe: no matching timers found [ 0.000000] Console: colour dummy device 80x30 [ 0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns Thanks, -Vladimir _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel