From patchwork Thu Jul 18 18:17:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Patrick Bellasi X-Patchwork-Id: 11049407 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D5F4E112C for ; Thu, 18 Jul 2019 18:19:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C60F02882F for ; Thu, 18 Jul 2019 18:19:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B99842883B; Thu, 18 Jul 2019 18:19:01 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7686B28870 for ; Thu, 18 Jul 2019 18:18:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391054AbfGRSSR (ORCPT ); Thu, 18 Jul 2019 14:18:17 -0400 Received: from foss.arm.com ([217.140.110.172]:33394 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391043AbfGRSSR (ORCPT ); Thu, 18 Jul 2019 14:18:17 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DABB91516; Thu, 18 Jul 2019 11:18:15 -0700 (PDT) Received: from e110439-lin.cambridge.arm.com (e110439-lin.cambridge.arm.com [10.1.194.43]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 361943F71A; Thu, 18 Jul 2019 11:18:13 -0700 (PDT) From: Patrick Bellasi To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-api@vger.kernel.org, cgroups@vger.kernel.org Cc: Ingo Molnar , Peter Zijlstra , Tejun Heo , "Rafael J . Wysocki" , Vincent Guittot , Viresh Kumar , Paul Turner , Michal Koutny , Quentin Perret , Dietmar Eggemann , Morten Rasmussen , Juri Lelli , Todd Kjos , Joel Fernandes , Steve Muckle , Suren Baghdasaryan , Alessio Balsini Subject: [PATCH v12 1/6] sched/core: uclamp: Extend CPU's cgroup controller Date: Thu, 18 Jul 2019 19:17:43 +0100 Message-Id: <20190718181748.28446-2-patrick.bellasi@arm.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190718181748.28446-1-patrick.bellasi@arm.com> References: <20190718181748.28446-1-patrick.bellasi@arm.com> MIME-Version: 1.0 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The cgroup CPU bandwidth controller allows to assign a specified (maximum) bandwidth to the tasks of a group. However this bandwidth is defined and enforced only on a temporal base, without considering the actual frequency a CPU is running on. Thus, the amount of computation completed by a task within an allocated bandwidth can be very different depending on the actual frequency the CPU is running that task. The amount of computation can be affected also by the specific CPU a task is running on, especially when running on asymmetric capacity systems like Arm's big.LITTLE. With the availability of schedutil, the scheduler is now able to drive frequency selections based on actual task utilization. Moreover, the utilization clamping support provides a mechanism to bias the frequency selection operated by schedutil depending on constraints assigned to the tasks currently RUNNABLE on a CPU. Giving the mechanisms described above, it is now possible to extend the cpu controller to specify the minimum (or maximum) utilization which should be considered for tasks RUNNABLE on a cpu. This makes it possible to better defined the actual computational power assigned to task groups, thus improving the cgroup CPU bandwidth controller which is currently based just on time constraints. Extend the CPU controller with a couple of new attributes uclamp.{min,max} which allow to enforce utilization boosting and capping for all the tasks in a group. Specifically: - uclamp.min: defines the minimum utilization which should be considered i.e. the RUNNABLE tasks of this group will run at least at a minimum frequency which corresponds to the uclamp.min utilization - uclamp.max: defines the maximum utilization which should be considered i.e. the RUNNABLE tasks of this group will run up to a maximum frequency which corresponds to the uclamp.max utilization These attributes: a) are available only for non-root nodes, both on default and legacy hierarchies, while system wide clamps are defined by a generic interface which does not depends on cgroups. This system wide interface enforces constraints on tasks in the root node. b) enforce effective constraints at each level of the hierarchy which are a restriction of the group requests considering its parent's effective constraints. Root group effective constraints are defined by the system wide interface. This mechanism allows each (non-root) level of the hierarchy to: - request whatever clamp values it would like to get - effectively get only up to the maximum amount allowed by its parent c) have higher priority than task-specific clamps, defined via sched_setattr(), thus allowing to control and restrict task requests. Add two new attributes to the cpu controller to collect "requested" clamp values. Allow that at each non-root level of the hierarchy. Validate local consistency by enforcing uclamp.min < uclamp.max. Keep it simple by not caring now about "effective" values computation and propagation along the hierarchy. Signed-off-by: Patrick Bellasi Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Tejun Heo --- Changes in v12: Message-ID: <20190715133801.yohhd2hywzsv3uyf@e110439-lin> - track requested cgroup's percentage to mask conversion rounding to userspace - introduce UCLAMP_PERCENT_{SHIFT,SCALE} to avoid hardcoded constants - s/uclamp_scale_from_percent()/capacity_from_percent()/ - move range check from cpu_uclamp_{min,max}_write() to capacity_from_percent() Message-ID: <20190718152327.vmnds3kpagh2xz2r@e110439-lin> - fix percentage's decimals format string --- Documentation/admin-guide/cgroup-v2.rst | 34 +++++ init/Kconfig | 22 +++ kernel/sched/core.c | 175 +++++++++++++++++++++++- kernel/sched/sched.h | 8 ++ 4 files changed, 238 insertions(+), 1 deletion(-) diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst index 3b29005aa981..5f1c266131b0 100644 --- a/Documentation/admin-guide/cgroup-v2.rst +++ b/Documentation/admin-guide/cgroup-v2.rst @@ -951,6 +951,13 @@ controller implements weight and absolute bandwidth limit models for normal scheduling policy and absolute bandwidth allocation model for realtime scheduling policy. +In all the above models, cycles distribution is defined only on a temporal +base and it does not account for the frequency at which tasks are executed. +The (optional) utilization clamping support allows to hint the schedutil +cpufreq governor about the minimum desired frequency which should always be +provided by a CPU, as well as the maximum desired frequency, which should not +be exceeded by a CPU. + WARNING: cgroup2 doesn't yet support control of realtime processes and the cpu controller can only be enabled when all RT processes are in the root cgroup. Be aware that system management software may already @@ -1016,6 +1023,33 @@ All time durations are in microseconds. Shows pressure stall information for CPU. See Documentation/accounting/psi.rst for details. + cpu.uclamp.min + A read-write single value file which exists on non-root cgroups. + The default is "0", i.e. no utilization boosting. + + The requested minimum utilization (protection) as a percentage + rational number, e.g. 12.34 for 12.34%. + + This interface allows reading and setting minimum utilization clamp + values similar to the sched_setattr(2). This minimum utilization + value is used to clamp the task specific minimum utilization clamp. + + The requested minimum utilization (protection) is always capped by + the current value for the maximum utilization (limit), i.e. + `cpu.uclamp.max`. + + cpu.uclamp.max + A read-write single value file which exists on non-root cgroups. + The default is "max". i.e. no utilization capping + + The requested maximum utilization (limit) as a percentage rational + number, e.g. 98.76 for 98.76%. + + This interface allows reading and setting maximum utilization clamp + values similar to the sched_setattr(2). This maximum utilization + value is used to clamp the task specific maximum utilization clamp. + + Memory ------ diff --git a/init/Kconfig b/init/Kconfig index bd7d650d4a99..ac285cfa78b6 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -928,6 +928,28 @@ config RT_GROUP_SCHED endif #CGROUP_SCHED +config UCLAMP_TASK_GROUP + bool "Utilization clamping per group of tasks" + depends on CGROUP_SCHED + depends on UCLAMP_TASK + default n + help + This feature enables the scheduler to track the clamped utilization + of each CPU based on RUNNABLE tasks currently scheduled on that CPU. + + When this option is enabled, the user can specify a min and max + CPU bandwidth which is allowed for each single task in a group. + The max bandwidth allows to clamp the maximum frequency a task + can use, while the min bandwidth allows to define a minimum + frequency a task will always use. + + When task group based utilization clamping is enabled, an eventually + specified task-specific clamp value is constrained by the cgroup + specified clamp value. Both minimum and maximum task clamping cannot + be bigger than the corresponding clamping defined at task group level. + + If in doubt, say N. + config CGROUP_PIDS bool "PIDs controller" help diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2b037f195473..fcc32afe53cb 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1149,8 +1149,12 @@ static void __init init_uclamp(void) /* System defaults allow max clamp values for both indexes */ uclamp_se_set(&uc_max, uclamp_none(UCLAMP_MAX), false); - for_each_clamp_id(clamp_id) + for_each_clamp_id(clamp_id) { uclamp_default[clamp_id] = uc_max; +#ifdef CONFIG_UCLAMP_TASK_GROUP + root_task_group.uclamp_req[clamp_id] = uc_max; +#endif + } } #else /* CONFIG_UCLAMP_TASK */ @@ -6727,6 +6731,19 @@ void ia64_set_curr_task(int cpu, struct task_struct *p) /* task_group_lock serializes the addition/removal of task groups */ static DEFINE_SPINLOCK(task_group_lock); +static inline void alloc_uclamp_sched_group(struct task_group *tg, + struct task_group *parent) +{ +#ifdef CONFIG_UCLAMP_TASK_GROUP + int clamp_id; + + for_each_clamp_id(clamp_id) { + uclamp_se_set(&tg->uclamp_req[clamp_id], + uclamp_none(clamp_id), false); + } +#endif +} + static void sched_free_group(struct task_group *tg) { free_fair_sched_group(tg); @@ -6750,6 +6767,8 @@ struct task_group *sched_create_group(struct task_group *parent) if (!alloc_rt_sched_group(tg, parent)) goto err; + alloc_uclamp_sched_group(tg, parent); + return tg; err: @@ -6970,6 +6989,132 @@ static void cpu_cgroup_attach(struct cgroup_taskset *tset) sched_move_task(task); } +#ifdef CONFIG_UCLAMP_TASK_GROUP + +#define _POW10(exp) ((unsigned int)1e##exp) +#define POW10(exp) _POW10(exp) + +struct uclamp_request { +#define UCLAMP_PERCENT_SHIFT 2 +#define UCLAMP_PERCENT_SCALE (100 * POW10(UCLAMP_PERCENT_SHIFT)) + s64 percent; + u64 util; + int ret; +}; + +static inline struct uclamp_request +capacity_from_percent(char *buf) +{ + struct uclamp_request req = { + .percent = UCLAMP_PERCENT_SCALE, + .util = SCHED_CAPACITY_SCALE, + .ret = 0, + }; + + buf = strim(buf); + if (strncmp("max", buf, 4)) { + req.ret = cgroup_parse_float(buf, UCLAMP_PERCENT_SHIFT, + &req.percent); + if (req.ret) + return req; + if (req.percent > UCLAMP_PERCENT_SCALE) { + req.ret = -ERANGE; + return req; + } + + req.util = req.percent << SCHED_CAPACITY_SHIFT; + req.util = DIV_ROUND_CLOSEST_ULL(req.util, UCLAMP_PERCENT_SCALE); + } + + return req; +} + +static ssize_t cpu_uclamp_min_write(struct kernfs_open_file *of, + char *buf, size_t nbytes, + loff_t off) +{ + struct uclamp_request req; + struct task_group *tg; + + req = capacity_from_percent(buf); + if (req.ret) + return req.ret; + + rcu_read_lock(); + + tg = css_tg(of_css(of)); + if (tg->uclamp_req[UCLAMP_MIN].value != req.util) + uclamp_se_set(&tg->uclamp_req[UCLAMP_MIN], req.util, false); + + /* Keep track of the actual requested value */ + tg->uclamp_pct[UCLAMP_MIN] = req.percent; + + rcu_read_unlock(); + + return nbytes; +} + +static ssize_t cpu_uclamp_max_write(struct kernfs_open_file *of, + char *buf, size_t nbytes, + loff_t off) +{ + struct uclamp_request req; + struct task_group *tg; + + req = capacity_from_percent(buf); + if (req.ret) + return req.ret; + + rcu_read_lock(); + + tg = css_tg(of_css(of)); + if (tg->uclamp_req[UCLAMP_MAX].value != req.util) + uclamp_se_set(&tg->uclamp_req[UCLAMP_MAX], req.util, false); + + /* Keep track of the actual requested value */ + tg->uclamp_pct[UCLAMP_MAX] = req.percent; + + rcu_read_unlock(); + + return nbytes; +} + +static inline void cpu_uclamp_print(struct seq_file *sf, + enum uclamp_id clamp_id) +{ + struct task_group *tg; + u64 util_clamp; + u64 percent; + u32 rem; + + rcu_read_lock(); + tg = css_tg(seq_css(sf)); + util_clamp = tg->uclamp_req[clamp_id].value; + rcu_read_unlock(); + + if (util_clamp == SCHED_CAPACITY_SCALE) { + seq_puts(sf, "max\n"); + return; + } + + percent = tg->uclamp_pct[clamp_id]; + percent = div_u64_rem(percent, POW10(UCLAMP_PERCENT_SHIFT), &rem); + seq_printf(sf, "%llu.%0*u\n", percent, UCLAMP_PERCENT_SHIFT, rem); +} + +static int cpu_uclamp_min_show(struct seq_file *sf, void *v) +{ + cpu_uclamp_print(sf, UCLAMP_MIN); + return 0; +} + +static int cpu_uclamp_max_show(struct seq_file *sf, void *v) +{ + cpu_uclamp_print(sf, UCLAMP_MAX); + return 0; +} +#endif /* CONFIG_UCLAMP_TASK_GROUP */ + #ifdef CONFIG_FAIR_GROUP_SCHED static int cpu_shares_write_u64(struct cgroup_subsys_state *css, struct cftype *cftype, u64 shareval) @@ -7314,6 +7459,20 @@ static struct cftype cpu_legacy_files[] = { .read_u64 = cpu_rt_period_read_uint, .write_u64 = cpu_rt_period_write_uint, }, +#endif +#ifdef CONFIG_UCLAMP_TASK_GROUP + { + .name = "uclamp.min", + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = cpu_uclamp_min_show, + .write = cpu_uclamp_min_write, + }, + { + .name = "uclamp.max", + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = cpu_uclamp_max_show, + .write = cpu_uclamp_max_write, + }, #endif { } /* Terminate */ }; @@ -7481,6 +7640,20 @@ static struct cftype cpu_files[] = { .seq_show = cpu_max_show, .write = cpu_max_write, }, +#endif +#ifdef CONFIG_UCLAMP_TASK_GROUP + { + .name = "uclamp.min", + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = cpu_uclamp_min_show, + .write = cpu_uclamp_min_write, + }, + { + .name = "uclamp.max", + .flags = CFTYPE_NOT_ON_ROOT, + .seq_show = cpu_uclamp_max_show, + .write = cpu_uclamp_max_write, + }, #endif { } /* terminate */ }; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 802b1f3405f2..f10557a2dea7 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -393,6 +393,14 @@ struct task_group { #endif struct cfs_bandwidth cfs_bandwidth; + +#ifdef CONFIG_UCLAMP_TASK_GROUP + /* The two decimal precision [%] value requested from user-space */ + unsigned int uclamp_pct[UCLAMP_CNT]; + /* Clamp values requested for a task group */ + struct uclamp_se uclamp_req[UCLAMP_CNT]; +#endif + }; #ifdef CONFIG_FAIR_GROUP_SCHED