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2016-05-16Revert "sched: set HMP scheduler's default initial task load to 100%"Joonwoo Park
This reverts commit 28f67e5a50d7c1bfc ("sched: set HMP scheduler's default initial task load to 100%") since 100% of init task load makes too much of power inefficiency on some targets. CRs-fixed: 1006303 Change-Id: I81b4ba8fdc2e2fe1b40f18904964098fa558989b Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: restrict sync wakee placement bias with waker's demandJoonwoo Park
Biasing sync wakee task towards waker CPU's cluster makes sense when the waker's demand is high enough so the wakee also can take advantage of high CPU frequency voted because of waker's load. Placing sync wakee on the low demand waker's CPU can lead placement imbalance which can lead unnecessary migration. Introduce a new tunable "sched_big_waker_task_load" that defines the big waker so scheduler avoid wakee on waker's cluster bias when the waker's load is below the tunable. CRs-fixed: 971295 Change-Id: I1550ede0a71ac8c9be74a7daabe164c6a269a3fb Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org> [joonwoop@codeaurora.org: fixed a minor conflict in include/linux/sched/sysctl.h.]
2016-03-23sched: add preference for waker cluster CPU in wakee task placementJoonwoo Park
If sync wakee task's demand is small it's worth to place the wakee task on waker's cluster for better performance in the sense that waker and wakee are corelated so the wakee should take advantage of waker cluster's frequency which is voted by the waker along with cache locality benefit. While biasing towards the waker's cluster we want to avoid the waker CPU as much as possible as placing the wakee on the waker's CPU can make the waker got preempted and migrated by load balancer. Introduce a new tunable 'sched_small_wakee_task_load' that differentiates eligible small wakee task and place the small wakee tasks on the waker's cluster. CRs-fixed: 971295 Change-Id: I96897d9a72a6f63dca4986d9219c2058cd5a7916 Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org> [joonwoop@codeaurora.org: fixed a minor conflict in include/linux/sched/sysctl.h.]
2016-03-23sched: Take downmigrate threshold into considerationPavankumar Kondeti
If the tasks are run on the higher capacity cluster solely due to the reason that they can not be be fit in the lower capacity cluster, the downmigrate threshold prevents the frequent tasks migrations between the clusters. Change-Id: I234a23ffd907c2476c94d5f6227dab1bb6c9bebb Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
2016-03-23sched: Provide a facility to restrict RT tasks to lower power clusterPavankumar Kondeti
The current CPU selection algorithm for RT tasks looks for the least loaded CPU in all clusters. Stop the search at the lowest possible power cluster based on "sched_restrict_cluster_spill" sysctl tunable. Change-Id: I34fdaefea56e0d1b7e7178d800f1bb86aa0ec01c Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
2016-03-23sched: Revise the inter cluster load balance restrictionsPavankumar Kondeti
The frequency based inter cluster load balance restrictions are not reliable as frequency does not provide a good estimate of the CPU's current load. Replace them with the spill_load and spill_nr_run based checks. The higher capacity cluster is restricted from pulling the tasks from the lower capacity cluster unless all of the lower capacity CPUs are above spill. This behavior can be controlled by a sysctl tunable and it is disabled by default (i.e. no load balance restrictions). Change-Id: I45c09c8adcb61a8a7d4e08beadf2f97f1805fb42 Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org> Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org> [joonwoop@codeaurora.org: fixed merge conflicts due to omitted changes for CONFIG_SCHED_QHMP.]
2016-03-23sched: select task's prev_cpu as the best CPU when it was chosen recentlyJoonwoo Park
Select given task's prev_cpu when the task slept for short period to reduce latency of task placement and migrations. A new tunable /proc/sys/kernel/sched_select_prev_cpu_us introduced to determine whether tasks are eligible to go through fast path. CRs-fixed: 947467 Change-Id: Ia507665b91f4e9f0e6ee1448d8df8994ead9739a [joonwoop@codeaurora.org: fixed conflict in include/linux/sched.h, include/linux/sched/sysctl.h, kernel/sched/core.c and kernel/sysctl.c] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: Add documentation for the revised hmp zone scheduler.Syed Rameez Mustafa
Add documentation for the revised task placement logic for the scheduler. Since the old file sched-hmp.txt is still required, add a new one instead. Change-Id: Ic7e3845c8d6b85b7918cd35c2a0a482a621fe525 Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
2016-03-23sched: set HMP scheduler's default initial task load to 100%Joonwoo Park
Set init_task_load to 100% to allow new tasks to wake up on the best performance CPUs. Change-Id: Ie762a3f629db554fb5cfa8c1d7b8b2391badf573 Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23Revert "sched: Use only partial wait time as task demand"Joonwoo Park
This reverts commit 0e2092e47488 ("sched: Use only partial wait time as task demand") as it causes performance regression. Change-Id: I3917858be98530807c479fc31eb76c0f22b4ea89 Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: auto adjust the upmigrate and downmigrate thresholdsPavankumar Kondeti
The load scale factor of a CPU gets boosted when its max freq is restricted. A task load at the same frequency is scaled higher than normal under this scenario. This results in tasks migrating early to the better capacity CPUs and their residency over there also gets increased as their inflated load would be relatively higher than than the downmigrate threshold. Auto adjust the upmigrate and downmigrate thresholds by a factor equal to rq->max_possible_freq/rq->max_freq of a lower capacity CPU. If the adjusted upmigrate threshold exceeds the window size, it is clipped to the window size. If the adjusted downmigrate threshold decreases the difference between the upmigrate and downmigrate, it is clipped to a value such that the difference between the modified and the original thresholds is same. Change-Id: Ifa70ee5d4ca5fe02789093c7f070c77629907f04 Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
2016-03-23sched: Use only partial wait time as task demandSyed Rameez Mustafa
The scheduler currently either considers a tasks entire wait time as task demand or completely ignores wait time based on the tunable sched_account_wait_time. Both approaches have their limitations, however. The former artificially boosts tasks demand when it may not actually be justified. With the latter, the scheduler runs the risk of never being able to recognize true load (consider two CPU hogs on a single little CPU). To achieve a compromise between these two extremes, change the load tracking algorithm to only consider part of a tasks wait time as its demand. The portion of wait time accounted as demand is determined by each tasks percent load, i.e. a task that waits for 10ms and has 60 % task load, only 6 ms of the wait will contribute to task demand. This approach is more fair as the scheduler now tries to determine how much of its wait time would a task actually have been using the CPU if it had been executing. It ensures that tasks with high demand continue to see most of the benefits of accounting wait time as busy time, however, lower demand tasks don't experience a disproportionately high boost to demand triggering unjustified big CPU usage. Note that this new approach is only applicable to wait time being considered as task demand and not wait time considered as CPU busy time. To achieve the above effect, ensure that anytime a task is waiting, its runtime in every relevant window segment is appropriately adjusted using its pct load. Change-Id: I6a698d6cb1adeca49113c3499029b422daf7871f Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
2016-03-23sched: add scheduling latency tracking procfs nodeJoonwoo Park
Add a new procfs node /proc/sys/kernel/sched_max_latency_us to track the worst scheduling latency. It provides easier way to identify maximum scheduling latency seen across the CPUs. Change-Id: I6e435bbf825c0a4dff2eded4a1256fb93f108d0e [joonwoop@codeaurora.org: fixed conflict in update_stats_wait_end().] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: warn/panic upon excessive scheduling latencyJoonwoo Park
Add new tunables /proc/sys/kernel/sched_latency_warn_threshold_us and /proc/sys/kernel/sched_latency_panic_threshold_us to warn or panic for the cases that tasks are runnable but not scheduled more than configured time. This helps to find out unacceptably high scheduling latency more easily. Change-Id: If077aba6211062cf26ee289970c5abcd1c218c82 [joonwoop@codeaurora.org: fixed conflict in update_stats_wait_end().] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: Add cgroup-based criteria for upmigrationSrivatsa Vaddagiri
It may be desirable to discourage upmigration of tasks belonging to some cgroups. Add a per-cgroup flag (upmigrate_discourage) that discourages upmigration of tasks of a cgroup. Tasks of the cgroup are allowed to upmigrate only under overcommitted scenario. Change-Id: I1780e420af1b6865c5332fb55ee1ee408b74d8ce Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org> [rameezmustafa@codeaurora.org: Use new cgroup APIs] Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
2016-03-23sched: Add userspace interface to set PF_WAKE_UP_IDLESrivatsa Vaddagiri
sched_prefer_idle flag controls whether tasks can be woken to any available idle cpu. It may be desirable to set sched_prefer_idle to 0 so that most tasks wake up to non-idle cpus under mostly_idle threshold and have specialized tasks override this behavior through other means. PF_WAKE_UP_IDLE flag per task provides exactly that. It lets tasks with PF_WAKE_UP_IDLE flag set be woken up to any available idle cpu independent of sched_prefer_idle flag setting. Currently only kernel-space API exists to set PF_WAKE_UP_IDLE flag for a task. This patch adds a user-space API (in /proc filesystem) to set PF_WAKE_UP_IDLE flag for a given task. /proc/[pid]/sched_wake_up_idle file can be written to set or clear PF_WAKE_UP_IDLE flag for a given task. Change-Id: I13a37e740195e503f457ebe291d54e83b230fbeb Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org> [rameezmustafa@codeaurora.org: Port to msm-3.18] Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org> [joonwoop@codeaurora.org: fixed minor conflict in kernel/sched/fair.c] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: Per-cpu prefer_idle flagSrivatsa Vaddagiri
Remove the global sysctl_sched_prefer_idle flag and replace it with a per-cpu prefer_idle flag. The per-cpu flag is expected to same for all cpus in a cluster. It thus provides convenient means to disable packing in one cluster while allowing packing in another cluster. Change-Id: Ie4cc73bb1a55b4eac5697be38e558546161faca1 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
2016-03-23sched: Consider PF_WAKE_UP_IDLE in select_best_cpu()Srivatsa Vaddagiri
sysctl_sched_prefer_idle controls selection of idle cpus for waking tasks. In some cases, waking to idle cpus help performance while in other cases it hurts (as tasks incur latency associated with C-state wakeup). Its ideal if scheduler can adapt prefer_idle behavior based on the task that is waking up, but that's hard for scheduler to figure by itself. PF_WAKE_UP_IDLE hint can be provided by external module/driver in such case to guide scheduler in preferring an idle cpu for select tasks irrespective of sysctl_sched_prefer_idle flag. This patch enhances select_best_cpu() to consider PF_WAKE_UP_IDLE hint. Wakeup posted from any task that has PF_WAKE_UP_IDLE set is a hint for scheduler to prefer idle cpu for waking tasks. Similarly scheduler will attempt to place any task with PF_WAKE_UP_IDLE set on idle cpu when they wakeup. CRs-Fixed: 773101 Change-Id: Ia8bf334d98fd9fd2ff9eda875430497d55d64ce6 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
2016-03-23sched: Add sysctl to enable power aware schedulingOlav Haugan
Add sysctl to enable energy awareness at runtime. This is useful for performance/power tuning/measurements and debugging. In addition this will match up with the Documentation/scheduler/sched-hmp.txt documentation. Change-Id: I0a9185498640d66917b38bf5d55f6c59fc60ad5c Signed-off-by: Olav Haugan <ohaugan@codeaurora.org> [rameezmustafa@codeaurora.org]: Port to msm-3.18] Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org
2016-03-23sched: Avoid frequent task migration due to EA in lbOlav Haugan
A new tunable exists that allow task migration to be throttled when the scheduler tries to do task migrations due to Energy Awareness (EA). This tunable is only taken into account when migrations occur in the tick path. Extend the usage of the tunable to take into account the load balancer (lb) path also. In addition ensure that the start of task execution on a CPU is updated correctly. If a task is preempted but still runnable on the same CPU the start of execution should not be updated. Only update the start of execution when a task wakes up after sleep or moves to a new CPU. Change-Id: I6b2a8e06d8d2df8e0f9f62b7aba3b4ee4b2c1c4d Signed-off-by: Olav Haugan <ohaugan@codeaurora.org> [rameezmustafa@codeaurora.org]: Port to msm-3.18] Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org [joonwoop@codeaurora.org: fixed conflict in group_classify() and set_task_cpu().] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: Add temperature to cpu_load trace pointOlav Haugan
Add the current CPU temperature to the sched_cpu_load trace point. This will allow us to track the CPU temperature. CRs-Fixed: 764788 Change-Id: Ib2e3559bbbe3fe07a6b7c8115db606828bc36254 Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
2016-03-23sched: Avoid frequent migration of running taskSrivatsa Vaddagiri
Power values for cpus can drop quite considerably when it goes idle. As a result, the best choice for running a single task in a cluster can vary quite rapidly. As the task keeps hopping cpus, other cpus go idle and start being seen as more favorable target for running a task, leading to task migrating almost every scheduler tick! Prevent this by keeping track of when a task started running on a cpu and allowing task migration in tick path (migration_needed()) on account of energy efficiency reasons only if the task has run sufficiently long (as determined by sysctl_sched_min_runtime variable). Note that currently sysctl_sched_min_runtime setting is considered only in scheduler_tick()->migration_needed() path and not in idle_balance() path. In other words, a task could be migrated to another cpu which did a idle_balance(). This limitation should not affect high-frequency migrations seen typically (when a single high-demand task runs on high-performance cpu). CRs-Fixed: 756570 Change-Id: I96413b7a81b623193c3bbcec6f3fa9dfec367d99 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org> [joonwoop@codeaurora.org: fixed conflict in set_task_cpu() and __schedule().] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: Provide knob to prefer mostly_idle over idle cpusSrivatsa Vaddagiri
sysctl_sched_prefer_idle lets the scheduler bias selection of idle cpus over mostly idle cpus for tasks. This knob could be useful to control balance between power and performance. Change-Id: Ide6eef684ef94ac8b9927f53c220ccf94976fe67 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
2016-03-23sched: make sched_cpu_high_irqload a runtime tunableSteve Muckle
It may be desirable to be able to alter the scehd_cpu_high_irqload setting easily, so make it a runtime tunable value. Change-Id: I832030eec2aafa101f0f435a4fd2d401d447880d Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
2016-03-23sched: trace: extend sched_cpu_load to print irqloadSteve Muckle
The irqload is used in determining whether CPUs are mostly idle so it is useful to know this value while viewing scheduler traces. Change-Id: Icbb74fc1285be878f254ae54886bdb161b14a270 Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
2016-03-23sched: Packing support until a frequency thresholdSrivatsa Vaddagiri
Add another dimension for task packing based on frequency. This patch adds a per-cpu tunable, rq->mostly_idle_freq, which when set will result in tasks being packed on a single cpu in cluster as long as cluster frequency is less than set threshold. Change-Id: I318e9af6c8788ddf5dfcda407d621449ea5343c0 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
2016-03-23sched: per-cpu mostly_idle thresholdSrivatsa Vaddagiri
sched_mostly_idle_load and sched_mostly_idle_nr_run knobs help pack tasks on cpus to some extent. In some cases, it may be desirable to have different packing limits for different cpus. For example, pack to a higher limit on high-performance cpus compared to power-efficient cpus. This patch removes the global mostly_idle tunables and makes them per-cpu, thus letting task packing behavior to be controlled in a fine-grained manner. Change-Id: Ifc254cda34b928eae9d6c342ce4c0f64e531e6c2 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
2016-03-23sched: Add API to set task's initial task loadSrivatsa Vaddagiri
Add a per-task attribute, init_load_pct, that is used to initialize newly created children's initial task load. This helps important applications launch their child tasks on cpus with highest capacity. Change-Id: Ie9665fd2aeb15203f95fd7f211c50bebbaa18727 Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org> [joonwoop@codeaurora.org: fixed conflict int init_new_task_load. se.avg.runnable_avg_sum has deprecated.] Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
2016-03-23sched: Document HMP schedulerSrivatsa Vaddagiri
Documentation on HMP scheduler design. Change-Id: I594e55531dafa5cf8f41ba34e1ae5bed0473c18a Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>
2015-05-19sched/dl/Documentation: Split Section 3Luca Abeni
Introduce 4 subsections to make Section 3 more readable. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-10-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Clarify the relationship between tasks' deadlines ↵Luca Abeni
and absolute scheduling deadlines Clarify what is the relationship between tasks' parameters and scheduling parameters, explaining how to set the scheduling parameters so that all the absolute deadlines of a task are respected. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-9-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Add some referencesLuca Abeni
Add a description of the Dhall's effect, some discussion about schedulability tests for global EDF, and references to real-time literature. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-8-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Add some notes on EDF schedulabilityLuca Abeni
Add a short discussion about sufficient and necessary schedulability tests, and add a simple example showing that if D_i != P_i then density based tests are only sufficient. Also add some references to scientific papers on schedulability tests for EDF that are both necessary and sufficient, and on their computational complexity. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-7-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Clarify indexing notationLuca Abeni
The "_i" index is used in this document to to denote a particular task, so "sum_i", "max_i" and "min_i" might be confusing. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-6-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Use consistent namingLuca Abeni
The name "C_i" was used (without previously defining it) instead of "WCET_i". Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-5-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Fix typosLuca Abeni
Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-4-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Switch to American EnglishLuca Abeni
This file previously mixed American and British English; switch to American for consistency. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-3-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-19sched/dl/Documentation: Correct the definition of density as C_i/min{D_i,P_i}Zhiqiang Zhang
C_i/min{D_i,T_i}, where T_i is not referred before, should be substituted with C_i/min{D_i,P_i}. Signed-off-by: Zhiqiang Zhang <zhangzhiqiang.zhang@huawei.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: henrik@austad.us Cc: juri.lelli@gmail.com Cc: raistlin@linux.it Link: http://lkml.kernel.org/r/1431954032-16473-2-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-04-04docs/completion.txt: Various tweaks and correctionsJonathan Corbet
Mostly language improvements to the new completions.txt document, but there is also a semantic correction in the description of completion_done() at the very end. Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2015-04-04doc: completion: context, scope and language fixesNicholas Mc Guire
Fix for imprecise/wrong statements on context in which wait_for_completion*() can be called, updated notes on "going out of scope" problems and some language fixups. Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2015-01-30doc: brief user documentation for completionNicholas Mc Guire
Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at> [jc: cleaned up some spurious blank lines] Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2014-09-16Documentation/scheduler/sched-deadline.txt: Add minimal main() appendixJuri Lelli
Add an appendix providing a simple self-contained code snippet showing how SCHED_DEADLINE reservations can be created by application developers. Signed-off-by: Juri Lelli <juri.lelli@arm.com> Reviewed-by: Henrik Austad <henrik@austad.us> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dario Faggioli <raistlin@linux.it> Cc: Juri Lelli <juri.lelli@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1410256636-26171-6-git-send-email-juri.lelli@arm.com [ Fixed some whitespace inconsistencies. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-09-16Documentation/scheduler/sched-deadline.txt: Add tests suite appendixJuri Lelli
Add an appendix briefly describing tools that can be used to test SCHED_DEADLINE (and the scheduler in general). Links to where source code of the tools is hosted are also provided. Signed-off-by: Juri Lelli <juri.lelli@arm.com> Reviewed-by: Henrik Austad <henrik@austad.us> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dario Faggioli <raistlin@linux.it> Cc: Juri Lelli <juri.lelli@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1410256636-26171-5-git-send-email-juri.lelli@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-09-16Documentation/scheduler/sched-deadline.txt: Improve and clarify AC bitsLuca Abeni
Admission control is of key importance for SCHED_DEADLINE, since it guarantees system schedulability (or tells us something about the degree of guarantees we can provide to the user). This patch improves and clarifies bits and pieces regarding AC, both for UP and SMP systems. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Juri Lelli <juri.lelli@arm.com> Reviewed-by: Henrik Austad <henrik@austad.us> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dario Faggioli <raistlin@linux.it> Cc: Juri Lelli <juri.lelli@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1410256636-26171-4-git-send-email-juri.lelli@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-09-16Documentation/scheduler/sched-deadline.txt: Rewrite section 4 introJuri Lelli
Section 4 intro was still describing the old interface. Rewrite it. Signed-off-by: Juri Lelli <juri.lelli@arm.com> Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Reviewed-by: Henrik Austad <henrik@austad.us> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dario Faggioli <raistlin@linux.it> Cc: Juri Lelli <juri.lelli@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1410256636-26171-3-git-send-email-juri.lelli@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-09-16Documentation/scheduler/sched-deadline.txt: Fix terminology and improve clarityLuca Abeni
Several small changes regarding SCHED_DEADLINE documentation that fix terminology and improve clarity and readability: - "current runtime" becomes "remaining runtime" - readablity of an equation is improved by introducing more spacing - clarify when admission control will certainly fail - new URL for CBS technical report - substitue "smallest" with "earliest" Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Juri Lelli <juri.lelli@arm.com> Reviewed-by: Henrik Austad <henrik@austad.us> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dario Faggioli <raistlin@linux.it> Cc: Juri Lelli <juri.lelli@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1410256636-26171-2-git-send-email-juri.lelli@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-04-07asm/system.h: clean asm/system.h from docsDavid Howells
Clean asm/system.h from docs as nothing should refer to that header anymore. Signed-off-by: David Howells <dhowells@redhat.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-02-10Documentation/: update 00-INDEX filesHenrik Austad
Some of the 00-INDEX files are somewhat outdated and some folders does not contain 00-INDEX at all. Only outdated (with the notably exception of spi) indexes are touched here, the 169 folders without 00-INDEX has not been touched. New 00-INDEX - spi/* was added in a series of commits dating back to 2006 Added files (missing in (*/)00-INDEX) - dmatest.txt was added by commit 851b7e16a07d ("dmatest: run test via debugfs") - this_cpu_ops.txt was added by commit a1b2a555d637 ("percpu: add documentation on this_cpu operations") - ww-mutex-design.txt was added by commit 040a0a371005 ("mutex: Add support for wound/wait style locks") - bcache.txt was added by commit cafe56359144 ("bcache: A block layer cache") - kernel-per-CPU-kthreads.txt was added by commit 49717cb40410 ("kthread: Document ways of reducing OS jitter due to per-CPU kthreads") - phy.txt was added by commit ff764963479a ("drivers: phy: add generic PHY framework") - block/null_blk was added by commit 12f8f4fc0314 ("null_blk: documentation") - module-signing.txt was added by commit 3cafea307642 ("Add Documentation/module-signing.txt file") - assoc_array.txt was added by commit 3cb989501c26 ("Add a generic associative array implementation.") - arm/IXP4xx was part of the initial repo - arm/cluster-pm-race-avoidance.txt was added by commit 7fe31d28e839 ("ARM: mcpm: introduce helpers for platform coherency exit/setup") - arm/firmware.txt was added by commit 7366b92a77fc ("ARM: Add interface for registering and calling firmware-specific operations") - arm/kernel_mode_neon.txt was added by commit 2afd0a05241d ("ARM: 7825/1: document the use of NEON in kernel mode") - arm/tcm.txt was added by commit bc581770cfdd ("ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3") - arm/vlocks.txt was added by commit 9762f12d3e05 ("ARM: mcpm: Add baremetal voting mutexes") - blackfin/gptimers-example.c, Makefile was added by commit 4b60779d5ea7 ("Blackfin: add an example showing how to use the gptimers API") - devicetree/usage-model.txt was added by commit 31134efc681a ("dt: Linux DT usage model documentation") - fb/api.txt was added by commit fb21c2f42879 ("fbdev: Add FOURCC-based format configuration API") - fb/sm501.txt was added by commit e6a049807105 ("video, sm501: add edid and commandline support") - fb/udlfb.txt was added by commit 96f8d864afd6 ("fbdev: move udlfb out of staging.") - filesystems/Makefile was added by commit 1e0051ae48a2 ("Documentation/fs/: split txt and source files") - filesystems/nfs/nfsd-admin-interfaces.txt was added by commit 8a4c6e19cfed ("nfsd: document kernel interfaces for nfsd configuration") - ide/warm-plug-howto.txt was added by commit f74c91413ec6 ("ide: add warm-plug support for IDE devices (take 2)") - laptops/Makefile was added by commit d49129accc21 ("Documentation/laptop/: split txt and source files") - leds/leds-blinkm.txt was added by commit b54cf35a7f65 ("LEDS: add BlinkM RGB LED driver, documentation and update MAINTAINERS") - leds/ledtrig-oneshot.txt was added by commit 5e417281cde2 ("leds: add oneshot trigger") - leds/ledtrig-transient.txt was added by commit 44e1e9f8e705 ("leds: add new transient trigger for one shot timer activation") - m68k/README.buddha was part of the initial repo - networking/LICENSE.(qla3xxx|qlcnic|qlge) was added by commits 40839129f779, c4e84bde1d59, 5a4faa873782 - networking/Makefile was added by commit 3794f3e812ef ("docsrc: build Documentation/ sources") - networking/i40evf.txt was added by commit 105bf2fe6b32 ("i40evf: add driver to kernel build system") - networking/ipsec.txt was added by commit b3c6efbc36e2 ("xfrm: Add file to document IPsec corner case") - networking/mac80211-auth-assoc-deauth.txt was added by commit 3cd7920a2be8 ("mac80211: add auth/assoc/deauth flow diagram") - networking/netlink_mmap.txt was added by commit 5683264c3981 ("netlink: add documentation for memory mapped I/O") - networking/nf_conntrack-sysctl.txt was added by commit c9f9e0e1597f ("netfilter: doc: add nf_conntrack sysctl api documentation") lan) - networking/team.txt was added by commit 3d249d4ca7d0 ("net: introduce ethernet teaming device") - networking/vxlan.txt was added by commit d342894c5d2f ("vxlan: virtual extensible lan") - power/runtime_pm.txt was added by commit 5e928f77a09a ("PM: Introduce core framework for run-time PM of I/O devices (rev. 17)") - power/charger-manager.txt was added by commit 3bb3dbbd56ea ("power_supply: Add initial Charger-Manager driver") - RCU/lockdep-splat.txt was added by commit d7bd2d68aa2e ("rcu: Document interpretation of RCU-lockdep splats") - s390/kvm.txt was added by 5ecee4b (KVM: s390: API documentation) - s390/qeth.txt was added by commit b4d72c08b358 ("qeth: bridgeport support - basic control") - scheduler/sched-bwc.txt was added by commit 88ebc08ea9f7 ("sched: Add documentation for bandwidth control") - scsi/advansys.txt was added by commit 4bd6d7f35661 ("[SCSI] advansys: Move documentation to Documentation/scsi") - scsi/bfa.txt was added by commit 1ec90174bdb4 ("[SCSI] bfa: add readme file") - scsi/bnx2fc.txt was added by commit 12b8fc10eaf4 ("[SCSI] bnx2fc: Add driver documentation") - scsi/cxgb3i.txt was added by commit c3673464ebc0 ("[SCSI] cxgb3i: Add cxgb3i iSCSI driver.") - scsi/hpsa.txt was added by commit 992ebcf14f3c ("[SCSI] hpsa: Add hpsa.txt to Documentation/scsi") - scsi/link_power_management_policy.txt was added by commit ca77329fb713 ("[libata] Link power management infrastructure") - scsi/osd.txt was added by commit 78e0c621deca ("[SCSI] osd: Documentation for OSD library") - scsi/scsi-parameter.txt was created/moved by commit 163475fb111c ("Documentation: move SCSI parameters to their own text file") - serial/driver was part of the initial repo - serial/n_gsm.txt was added by commit 323e84122ec6 ("n_gsm: add a documentation") - timers/Makefile was added by commit 3794f3e812ef ("docsrc: build Documentation/ sources") - virt/kvm/s390.txt was added by commit d9101fca3d57 ("KVM: s390: diagnose call documentation") - vm/split_page_table_lock was added by commit 49076ec2ccaf ("mm: dynamically allocate page->ptl if it cannot be embedded to struct page") - w1/slaves/w1_ds28e04 was added by commit fbf7f7b4e2ae ("w1: Add 1-wire slave device driver for DS28E04-100") - w1/masters/omap-hdq was added by commit e0a29382c6f5 ("hdq: documentation for OMAP HDQ") - x86/early-microcode.txt was added by commit 0d91ea86a895 ("x86, doc: Documentation for early microcode loading") - x86/earlyprintk.txt was added by commit a1aade478862 ("x86/doc: mini-howto for using earlyprintk=dbgp") - x86/entry_64.txt was added by commit 8b4777a4b50c ("x86-64: Document some of entry_64.S") - x86/pat.txt was added by commit d27554d874c7 ("x86: PAT documentation") Moved files - arm/kernel_user_helpers.txt was moved out of arch/arm/kernel by commit 37b8304642c7 ("ARM: kuser: move interface documentation out of the source code") - efi-stub.txt was moved out of x86/ and down into Documentation/ in commit 4172fe2f8a47 ("EFI stub documentation updates") - laptops/hpfall.c was moved out of hwmon/ and into laptops/ in commit efcfed9bad88 ("Move hp_accel to drivers/platform/x86") - commit 5616c23ad9cd ("x86: doc: move x86-generic documentation from Doc/x86/i386"): * x86/usb-legacy-support.txt * x86/boot.txt * x86/zero_page.txt - power/video_extension.txt was moved to acpi in commit 70e66e4df191 ("ACPI / video: move video_extension.txt to Documentation/acpi") Removed files (left in 00-INDEX) - memory.txt was removed by commit 00ea8990aadf ("memory.txt: remove stray information") - gpio.txt was moved to gpio/ in commit fd8e198cfcaa ("Documentation: gpiolib: document new interface") - networking/DLINK.txt was removed by commit 168e06ae26dd ("drivers/net: delete old parallel port de600/de620 drivers") - serial/hayes-esp.txt was removed by commit f53a2ade0bb9 ("tty: esp: remove broken driver") - s390/TAPE was removed by commit 9e280f669308 ("[S390] remove tape block docu") - vm/locking was removed by commit 57ea8171d2bc ("mm: documentation: remove hopelessly out-of-date locking doc") - laptops/acer-wmi.txt was remvoed by commit 020036678e81 ("acer-wmi: Delete out-of-date documentation") Typos/misc issues - rpc-server-gss.txt was added as knfsd-rpcgss.txt in commit 030d794bf498 ("SUNRPC: Use gssproxy upcall for server RPCGSS authentication.") - commit b88cf73d9278 ("net: add missing entries to Documentation/networking/00-INDEX") * generic-hdlc.txt was added as generic_hdlc.txt * spider_net.txt was added as spider-net.txt - w1/master/mxc-w1 was added as mxc_w1 by commit a5fd9139f74c ("w1: add 1-wire master driver for i.MX27 / i.MX31") - s390/zfcpdump.txt was added as zfcpdump by commit 6920c12a407e ("[S390] Add Documentation/s390/00-INDEX.") Signed-off-by: Henrik Austad <henrik@austad.us> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [rcu bits] Acked-by: Rob Landley <rob@landley.net> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Rob Herring <robh+dt@kernel.org> Cc: David S. Miller <davem@davemloft.net> Cc: Mark Brown <broonie@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Gleb Natapov <gleb@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Len Brown <len.brown@intel.com> Cc: James Bottomley <JBottomley@parallels.com> Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-01-28sched/deadline: Add sched_dl documentationDario Faggioli
Add in Documentation/scheduler/ some hints about the design choices, the usage and the future possible developments of the sched_dl scheduling class and of the SCHED_DEADLINE policy. Reviewed-by: Henrik Austad <henrik@austad.us> Signed-off-by: Dario Faggioli <raistlin@linux.it> Signed-off-by: Juri Lelli <juri.lelli@gmail.com> [ Re-wrote sections 2 and 3. ] Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1390821615-23247-1-git-send-email-juri.lelli@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-11-12Merge tag 'h8300-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging Pull h8300 platform removal from Guenter Roeck: "The patch series has been in -next for more than one relase cycle. I did get a number of Acks, and no objections. H8/300 has been dead for several years, the kernel for it has not compiled for ages, and recent versions of gcc for it are broken. Remove support for it" * tag 'h8300-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging: CREDITS: Add Yoshinori Sato for h8300 fs/minix: Drop dependency on H8300 Drop remaining references to H8/300 architecture Drop MAINTAINERS entry for H8/300 watchdog: Drop references to H8300 architecture net/ethernet: Drop H8/300 Ethernet driver net/ethernet: smsc9194: Drop conditional code for H8/300 ide: Drop H8/300 driver Drop support for Renesas H8/300 (h8300) architecture
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-19 23:40:55 +0000