From: Tejun Heo <tj@kernel.org>
To: torvalds@linux-foundation.org, mingo@redhat.com,
peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
bristot@redhat.com, vschneid@redhat.com, ast@kernel.org,
daniel@iogearbox.net, andrii@kernel.org, martin.lau@kernel.org,
joshdon@google.com, brho@google.com, pjt@google.com,
derkling@google.com, haoluo@google.com, dvernet@meta.com,
dschatzberg@meta.com, dskarlat@cs.cmu.edu, riel@surriel.com
Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kernel-team@meta.com
Subject: Re: [PATCH 14/31] sched_ext: Implement BPF extensible scheduler class
Date: Tue, 6 Dec 2022 11:44:19 -1000 [thread overview]
Message-ID: <Y4+3sw9wEUKJ0zh4@slm.duckdns.org> (raw)
In-Reply-To: <20221130082313.3241517-15-tj@kernel.org>
On Tue, Nov 29, 2022 at 10:22:56PM -1000, Tejun Heo wrote:
> + /**
> + * dispatch - Dispatch tasks from the BPF scheduler into dsq's
> + * @cpu: CPU to dispatch tasks for
> + * @prev: previous task being switched out
> + *
> + * Called when a CPU can't find a task to execute after ops.consume().
> + * The operation should dispatch one or more tasks from the BPF
> + * scheduler to the dsq's using scx_bpf_dispatch(). The maximum number
> + * of tasks which can be dispatched in a single call is specified by the
> + * @dispatch_max_batch field of this struct.
> + */
> + void (*dispatch)(s32 cpu, struct task_struct *prev);
> +
> + /**
> + * consume - Consume tasks from the dsq's to the local dsq for execution
> + * @cpu: CPU to consume tasks for
> + *
> + * Called when a CPU's local dsq is empty. The operation should transfer
> + * one or more tasks from the dsq's to the CPU's local dsq using
> + * scx_bpf_consume(). If this function fails to fill the local dsq,
> + * ops.dispatch() will be called.
> + *
> + * This operation is unnecessary if the BPF scheduler always dispatches
> + * either to one of the local dsq's or the global dsq. If implemented,
> + * this operation is also responsible for consuming the global_dsq.
> + */
> + void (*consume)(s32 cpu);
> +
> + /**
> + * consume_final - Final consume call before going idle
> + * @cpu: CPU to consume tasks for
> + *
> + * After ops.consume() and .dispatch(), @cpu still doesn't have a task
> + * to execute and is about to go idle. This operation can be used to
> + * implement more aggressive consumption strategies. Otherwise
> + * equivalent to ops.consume().
> + */
> + void (*consume_final)(s32 cpu);
Doesn't really change the big picture but I ended up merging
ops.consume[_final]() into ops.dispatch() which should make the dispatch
path both simpler and more flexible.
Thanks.
--
tejun
next prev parent reply other threads:[~2022-12-06 21:44 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-30 8:22 [PATCHSET RFC] sched: Implement BPF extensible scheduler class Tejun Heo
2022-11-30 8:22 ` [PATCH 01/31] rhashtable: Allow rhashtable to be used from irq-safe contexts Tejun Heo
2022-11-30 16:35 ` Linus Torvalds
2022-11-30 17:00 ` Tejun Heo
2022-12-06 21:36 ` [PATCH v2 " Tejun Heo
2022-12-09 10:50 ` patchwork-bot+netdevbpf
2022-11-30 8:22 ` [PATCH 02/31] cgroup: Implement cgroup_show_cftypes() Tejun Heo
2022-11-30 8:22 ` [PATCH 03/31] BPF: Add @prog to bpf_struct_ops->check_member() Tejun Heo
2022-11-30 8:22 ` [PATCH 04/31] sched: Allow sched_cgroup_fork() to fail and introduce sched_cancel_fork() Tejun Heo
2022-12-12 11:13 ` Peter Zijlstra
2022-12-12 18:03 ` Tejun Heo
2022-12-12 20:07 ` Peter Zijlstra
2022-12-12 20:12 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 05/31] sched: Add sched_class->reweight_task() Tejun Heo
2022-12-12 11:22 ` Peter Zijlstra
2022-12-12 17:34 ` Tejun Heo
2022-12-12 20:11 ` Peter Zijlstra
2022-12-12 20:15 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 06/31] sched: Add sched_class->switching_to() and expose check_class_changing/changed() Tejun Heo
2022-12-12 11:28 ` Peter Zijlstra
2022-12-12 17:59 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 07/31] sched: Factor out cgroup weight conversion functions Tejun Heo
2022-11-30 8:22 ` [PATCH 08/31] sched: Expose css_tg() and __setscheduler_prio() in kernel/sched/sched.h Tejun Heo
2022-12-12 11:49 ` Peter Zijlstra
2022-12-12 17:47 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 09/31] sched: Enumerate CPU cgroup file types Tejun Heo
2022-11-30 8:22 ` [PATCH 10/31] sched: Add @reason to sched_class->rq_{on|off}line() Tejun Heo
2022-12-12 11:57 ` Peter Zijlstra
2022-12-12 18:06 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 11/31] sched: Add @reason to sched_move_task() Tejun Heo
2022-12-12 12:00 ` Peter Zijlstra
2022-12-12 17:54 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 12/31] sched: Add normal_policy() Tejun Heo
2022-11-30 8:22 ` [PATCH 13/31] sched_ext: Add boilerplate for extensible scheduler class Tejun Heo
2022-11-30 8:22 ` [PATCH 14/31] sched_ext: Implement BPF " Tejun Heo
2022-12-02 17:08 ` Barret Rhoden
2022-12-02 18:01 ` Tejun Heo
2022-12-06 21:42 ` Tejun Heo
2022-12-06 21:44 ` Tejun Heo [this message]
2022-12-11 22:33 ` Julia Lawall
2022-12-12 2:15 ` Tejun Heo
2022-12-12 6:03 ` Julia Lawall
2022-12-12 6:08 ` Tejun Heo
2022-12-12 12:31 ` Peter Zijlstra
2022-12-12 20:03 ` Tejun Heo
2022-12-12 12:53 ` Peter Zijlstra
2022-12-12 21:33 ` Tejun Heo
2022-12-13 10:55 ` Peter Zijlstra
2022-12-13 18:12 ` Tejun Heo
2022-12-13 18:40 ` Rik van Riel
2022-12-13 23:20 ` Josh Don
2022-12-13 10:57 ` Peter Zijlstra
2022-12-13 17:32 ` Tejun Heo
2022-11-30 8:22 ` [PATCH 15/31] sched_ext: [TEMPORARY] Add temporary workaround kfunc helpers Tejun Heo
2022-11-30 8:22 ` [PATCH 16/31] sched_ext: Add scx_example_dummy and scx_example_qmap example schedulers Tejun Heo
2022-11-30 8:22 ` [PATCH 17/31] sched_ext: Add sysrq-S which disables the BPF scheduler Tejun Heo
2022-11-30 8:23 ` [PATCH 18/31] sched_ext: Implement runnable task stall watchdog Tejun Heo
2022-11-30 8:23 ` [PATCH 19/31] sched_ext: Allow BPF schedulers to disallow specific tasks from joining SCHED_EXT Tejun Heo
2022-11-30 8:23 ` [PATCH 20/31] sched_ext: Allow BPF schedulers to switch all eligible tasks into sched_ext Tejun Heo
2022-11-30 8:23 ` [PATCH 21/31] sched_ext: Implement scx_bpf_kick_cpu() and task preemption support Tejun Heo
2022-11-30 8:23 ` [PATCH 22/31] sched_ext: Add task state tracking operations Tejun Heo
2022-11-30 8:23 ` [PATCH 23/31] sched_ext: Implement tickless support Tejun Heo
2022-11-30 8:23 ` [PATCH 24/31] sched_ext: Add cgroup support Tejun Heo
2022-11-30 8:23 ` [PATCH 25/31] sched_ext: Implement SCX_KICK_WAIT Tejun Heo
2022-11-30 8:23 ` [PATCH 26/31] sched_ext: Implement sched_ext_ops.cpu_acquire/release() Tejun Heo
2022-11-30 8:23 ` [PATCH 27/31] sched_ext: Implement sched_ext_ops.cpu_online/offline() Tejun Heo
2022-11-30 8:23 ` [PATCH 28/31] sched_ext: Add Documentation/scheduler/sched-ext.rst Tejun Heo
2022-12-12 4:01 ` Bagas Sanjaya
2022-12-12 6:28 ` Tejun Heo
2022-12-12 13:07 ` Bagas Sanjaya
2022-12-12 17:30 ` Tejun Heo
2022-12-12 12:39 ` Peter Zijlstra
2022-12-12 17:16 ` Tejun Heo
2022-11-30 8:23 ` [PATCH 29/31] sched_ext: Add a basic, userland vruntime scheduler Tejun Heo
2022-11-30 8:23 ` [PATCH 30/31] BPF: [TEMPORARY] Nerf BTF scalar value check Tejun Heo
2022-11-30 8:23 ` [PATCH 31/31] sched_ext: Add a rust userspace hybrid example scheduler Tejun Heo
2022-12-12 14:03 ` Peter Zijlstra
2022-12-12 21:05 ` Peter Oskolkov
2022-12-13 11:02 ` Peter Zijlstra
2022-12-13 18:24 ` Peter Oskolkov
2022-12-12 22:00 ` Tejun Heo
2022-12-12 22:18 ` Josh Don
2022-12-13 11:30 ` Peter Zijlstra
2022-12-13 20:33 ` Tejun Heo
2022-12-14 2:00 ` Josh Don
2022-12-12 9:37 ` [PATCHSET RFC] sched: Implement BPF extensible scheduler class Peter Zijlstra
2022-12-12 17:27 ` Tejun Heo
2022-12-12 10:14 ` Peter Zijlstra
2022-12-14 2:11 ` Josh Don
2022-12-14 8:55 ` Peter Zijlstra
2022-12-14 22:23 ` Tejun Heo
2022-12-14 23:20 ` Barret Rhoden
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