From: Tejun Heo <tj@kernel.org>
To: Andrea Righi <andrea.righi@canonical.com>
Cc: 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,
linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
kernel-team@meta.com
Subject: Re: [PATCH 28/32] sched_ext: Implement core-sched support
Date: Fri, 21 Apr 2023 04:31:23 -1000 [thread overview]
Message-ID: <ZEKeO7CI_ESpZS2H@slm.duckdns.org> (raw)
In-Reply-To: <ZEGY28sZgvEL7ssi@righiandr-XPS-13-7390>
Hello, Andrea.
On Thu, Apr 20, 2023 at 09:56:11PM +0200, Andrea Righi wrote:
> On Fri, Mar 17, 2023 at 11:33:29AM -1000, Tejun Heo wrote:
> ...
> >
> > +static int balance_scx(struct rq *rq, struct task_struct *prev,
> > + struct rq_flags *rf)
> > +{
> > + int ret;
> > +
> > + ret = balance_one(rq, prev, rf, true);
> > +
> > + /*
> > + * When core-sched is enabled, this ops.balance() call will be followed
> > + * by put_prev_scx() and pick_task_scx() on this CPU and pick_task_scx()
> > + * on the SMT siblings. Balance the siblings too.
> > + */
> > + if (sched_core_enabled(rq)) {
> > + const struct cpumask *smt_mask = cpu_smt_mask(cpu_of(rq));
>
> balance_scx() should be a no-op if CONFIG_SCHED_SMT is undefined or we
> may get a build error here.
>
> For example with a minimal ppc64le config (and CONFIG_SCHED_SMT off) I
> can reproduce this:
>
> ./arch/powerpc/include/asm/smp.h:139:22: error: implicit declaration of function 'cpu_smt_mask'; did you mean 'cpu_cpu_mask'? [-Werror=implicit-function-declaration]
>
> So maybe have something like this (or similar):
>
> #ifdef CONFIG_SCHED_SMT
> ...
> #else
> static inline int balance_scx(struct rq *rq, struct task_struct *prev,
> struct rq_flags *rf)
> {
> return 0
> }
> #endif
Will fix.
Thank you.
--
tejun
next prev parent reply other threads:[~2023-04-21 14:31 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-17 21:33 [PATCHSET v3] sched: Implement BPF extensible scheduler class Tejun Heo
2023-03-17 21:33 ` [PATCH 01/32] cgroup: Implement cgroup_show_cftypes() Tejun Heo
2023-03-17 21:33 ` [PATCH 02/32] sched: Encapsulate task attribute change sequence into a helper macro Tejun Heo
2023-03-17 21:33 ` [PATCH 03/32] sched: Restructure sched_class order sanity checks in sched_init() Tejun Heo
2023-03-17 21:33 ` [PATCH 04/32] sched: Allow sched_cgroup_fork() to fail and introduce sched_cancel_fork() Tejun Heo
2023-03-17 21:33 ` [PATCH 05/32] sched: Add sched_class->reweight_task() Tejun Heo
2023-03-17 21:33 ` [PATCH 06/32] sched: Add sched_class->switching_to() and expose check_class_changing/changed() Tejun Heo
2023-03-17 21:33 ` [PATCH 07/32] sched: Factor out cgroup weight conversion functions Tejun Heo
2023-03-17 21:33 ` [PATCH 08/32] sched: Expose css_tg(), __setscheduler_prio() and SCHED_CHANGE_BLOCK() Tejun Heo
2023-03-17 21:33 ` [PATCH 09/32] sched: Enumerate CPU cgroup file types Tejun Heo
2023-03-17 21:33 ` [PATCH 10/32] sched: Add @reason to sched_class->rq_{on|off}line() Tejun Heo
2023-03-17 21:33 ` [PATCH 11/32] sched: Add normal_policy() Tejun Heo
2023-03-17 21:33 ` [PATCH 12/32] sched_ext: Add boilerplate for extensible scheduler class Tejun Heo
2023-03-17 21:33 ` [PATCH 13/32] sched_ext: Implement BPF " Tejun Heo
2023-03-17 21:33 ` [PATCH 14/32] sched_ext: Add scx_example_simple and scx_example_qmap example schedulers Tejun Heo
2023-03-17 21:33 ` [PATCH 15/32] sched_ext: Add sysrq-S which disables the BPF scheduler Tejun Heo
2023-03-17 21:33 ` [PATCH 16/32] sched_ext: Implement runnable task stall watchdog Tejun Heo
2023-03-17 21:33 ` [PATCH 17/32] sched_ext: Allow BPF schedulers to disallow specific tasks from joining SCHED_EXT Tejun Heo
2023-03-17 21:33 ` [PATCH 18/32] sched_ext: Allow BPF schedulers to switch all eligible tasks into sched_ext Tejun Heo
2023-03-17 21:33 ` [PATCH 19/32] sched_ext: Implement scx_bpf_kick_cpu() and task preemption support Tejun Heo
2023-03-17 21:33 ` [PATCH 20/32] sched_ext: Make watchdog handle ops.dispatch() looping stall Tejun Heo
2023-03-17 21:33 ` [PATCH 21/32] sched_ext: Add task state tracking operations Tejun Heo
2023-03-17 21:33 ` [PATCH 22/32] sched_ext: Implement tickless support Tejun Heo
2023-03-17 21:33 ` [PATCH 23/32] sched_ext: Track tasks that are subjects of the in-flight SCX operation Tejun Heo
2023-03-17 21:33 ` [PATCH 24/32] sched_ext: Add cgroup support Tejun Heo
2023-04-20 20:02 ` Andrea Righi
2023-04-21 14:32 ` Tejun Heo
2023-03-17 21:33 ` [PATCH 25/32] sched_ext: Implement SCX_KICK_WAIT Tejun Heo
2023-03-17 21:33 ` [PATCH 26/32] sched_ext: Implement sched_ext_ops.cpu_acquire/release() Tejun Heo
2023-03-17 21:33 ` [PATCH 27/32] sched_ext: Implement sched_ext_ops.cpu_online/offline() Tejun Heo
2023-03-17 21:33 ` [PATCH 28/32] sched_ext: Implement core-sched support Tejun Heo
2023-04-20 19:56 ` Andrea Righi
2023-04-21 14:31 ` Tejun Heo [this message]
2023-03-17 21:33 ` [PATCH 29/32] sched_ext: Add vtime-ordered priority queue to dispatch_q's Tejun Heo
2023-03-17 21:33 ` [PATCH 30/32] sched_ext: Documentation: scheduler: Document extensible scheduler class Tejun Heo
2023-03-18 2:05 ` Bagas Sanjaya
2023-03-17 21:33 ` [PATCH 31/32] sched_ext: Add a basic, userland vruntime scheduler Tejun Heo
2023-03-17 21:33 ` [PATCH 32/32] sched_ext: Add a rust userspace hybrid example scheduler Tejun Heo
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