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From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	rostedt <rostedt@goodmis.org>, Ben Segall <bsegall@google.com>,
	Mel Gorman <mgorman@suse.de>, bristot <bristot@redhat.com>,
	Borislav Petkov <bp@alien8.de>, x86 <x86@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Jens Axboe <axboe@kernel.dk>,
	Alasdair Kergon <agk@redhat.com>,
	Mike Snitzer <snitzer@redhat.com>,
	dm-devel@redhat.com, "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Felipe Balbi <balbi@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Tejun Heo <tj@kernel.org>, Zefan Li <lizefan.x@bytedance.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Jason Wessel <jason.wessel@windriver.com>,
	Daniel Thompson <daniel.thompson@linaro.org>,
	Douglas Anderson <dianders@chromium.org>, acme <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Pavel Machek <pavel@ucw.cz>, Will Deacon <will@kernel.org>,
	Waiman Long <longman@redhat.com>,
	Boqun Feng <boqun.feng@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>,
	Davidlohr Bueso <dave@stgolabs.net>, paulmck <paulmck@kernel.org>,
	Josh Triplett <josh@joshtriplett.org>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	"Joel Fernandes, Google" <joel@joelfernandes.org>,
	John Stultz <john.stultz@linaro.org>,
	Stephen Boyd <sboyd@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-block@vger.kernel.org, netdev <netdev@vger.kernel.org>,
	linux-usb@vger.kernel.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	cgroups <cgroups@vger.kernel.org>,
	kgdb-bugreport@lists.sourceforge.net,
	linux-perf-users@vger.kernel.org, linux-pm@vger.kernel.org,
	rcu <rcu@vger.kernel.org>, linux-mm <linux-mm@kvack.org>,
	KVM list <kvm@vger.kernel.org>
Subject: Re: [PATCH 3/6] sched,perf,kvm: Fix preemption condition
Date: Wed, 2 Jun 2021 09:59:07 -0400 (EDT)	[thread overview]
Message-ID: <1873020549.5854.1622642347895.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <20210602133040.398289363@infradead.org>

----- On Jun 2, 2021, at 9:12 AM, Peter Zijlstra peterz@infradead.org wrote:

> When ran from the sched-out path (preempt_notifier or perf_event),
> p->state is irrelevant to determine preemption. You can get preempted
> with !task_is_running() just fine.
> 
> The right indicator for preemption is if the task is still on the
> runqueue in the sched-out path.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> kernel/events/core.c |    7 +++----
> virt/kvm/kvm_main.c  |    2 +-
> 2 files changed, 4 insertions(+), 5 deletions(-)
> 
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8568,13 +8568,12 @@ static void perf_event_switch(struct tas
> 		},
> 	};
> 
> -	if (!sched_in && task->state == TASK_RUNNING)
> +	if (!sched_in && current->on_rq) {

This changes from checking task->state to current->on_rq, but this change
from "task" to "current" is not described in the commit message, which is odd.

Are we really sure that task == current here ?

Thanks,

Mathieu

> 		switch_event.event_id.header.misc |=
> 				PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
> +	}
> 
> -	perf_iterate_sb(perf_event_switch_output,
> -		       &switch_event,
> -		       NULL);
> +	perf_iterate_sb(perf_event_switch_output, &switch_event, NULL);
> }
> 
> /*
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -4869,7 +4869,7 @@ static void kvm_sched_out(struct preempt
> {
> 	struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
> 
> -	if (current->state == TASK_RUNNING) {
> +	if (current->on_rq) {
> 		WRITE_ONCE(vcpu->preempted, true);
> 		WRITE_ONCE(vcpu->ready, true);
>  	}

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

WARNING: multiple messages have this Message-ID (diff)
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>, Pavel Machek <pavel@ucw.cz>,
	Mike Snitzer <snitzer@redhat.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	kgdb-bugreport@lists.sourceforge.net,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>, Ben Segall <bsegall@google.com>,
	linux-mm <linux-mm@kvack.org>,
	dm-devel@redhat.com, Paolo Bonzini <pbonzini@redhat.com>,
	Zefan Li <lizefan.x@bytedance.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"Joel Fernandes, Google" <joel@joelfernandes.org>,
	netdev <netdev@vger.kernel.org>, Jiri Olsa <jolsa@redhat.com>,
	Alasdair Kergon <agk@redhat.com>,
	Daniel Thompson <daniel.thompson@linaro.org>,
	Davidlohr Bueso <dave@stgolabs.net>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	KVM list <kvm@vger.kernel.org>, Will Deacon <will@kernel.org>,
	cgroups <cgroups@vger.kernel.org>, x86 <x86@kernel.org>,
	Ingo Molnar <mingo@redhat.com>, Mel Gorman <mgorman@suse.de>,
	Jakub Kicinski <kuba@kernel.org>, paulmck <paulmck@kernel.org>,
	linux-pm@vger.kernel.org, Boqun Feng <boqun.feng@gmail.com>,
	Jason Wessel <jason.wessel@windriver.com>,
	Josh Triplett <josh@joshtriplett.org>,
	rostedt <rostedt@goodmis.org>,
	linux-block@vger.kernel.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	Borislav Petkov <bp@alien8.de>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Waiman Long <longman@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>, acme <acme@kernel.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Jens Axboe <axboe@kernel.dk>, Felipe Balbi <balbi@kernel.org>,
	Stephen Boyd <sboyd@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Douglas Anderson <dianders@chromium.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-perf-users@vger.kernel.org,
	Johannes Weiner <hannes@cmpxchg.org>, Tejun Heo <tj@kernel.org>,
	John Stultz <john.stultz@linaro.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	rcu <rcu@vger.kernel.org>, bristot <bristot@redhat.com>,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [dm-devel] [PATCH 3/6] sched, perf, kvm: Fix preemption condition
Date: Wed, 2 Jun 2021 09:59:07 -0400 (EDT)	[thread overview]
Message-ID: <1873020549.5854.1622642347895.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <20210602133040.398289363@infradead.org>

----- On Jun 2, 2021, at 9:12 AM, Peter Zijlstra peterz@infradead.org wrote:

> When ran from the sched-out path (preempt_notifier or perf_event),
> p->state is irrelevant to determine preemption. You can get preempted
> with !task_is_running() just fine.
> 
> The right indicator for preemption is if the task is still on the
> runqueue in the sched-out path.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> kernel/events/core.c |    7 +++----
> virt/kvm/kvm_main.c  |    2 +-
> 2 files changed, 4 insertions(+), 5 deletions(-)
> 
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8568,13 +8568,12 @@ static void perf_event_switch(struct tas
> 		},
> 	};
> 
> -	if (!sched_in && task->state == TASK_RUNNING)
> +	if (!sched_in && current->on_rq) {

This changes from checking task->state to current->on_rq, but this change
from "task" to "current" is not described in the commit message, which is odd.

Are we really sure that task == current here ?

Thanks,

Mathieu

> 		switch_event.event_id.header.misc |=
> 				PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
> +	}
> 
> -	perf_iterate_sb(perf_event_switch_output,
> -		       &switch_event,
> -		       NULL);
> +	perf_iterate_sb(perf_event_switch_output, &switch_event, NULL);
> }
> 
> /*
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -4869,7 +4869,7 @@ static void kvm_sched_out(struct preempt
> {
> 	struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
> 
> -	if (current->state == TASK_RUNNING) {
> +	if (current->on_rq) {
> 		WRITE_ONCE(vcpu->preempted, true);
> 		WRITE_ONCE(vcpu->ready, true);
>  	}

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

--
dm-devel mailing list
dm-devel@redhat.com
https://listman.redhat.com/mailman/listinfo/dm-devel


WARNING: multiple messages have this Message-ID (diff)
From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	rostedt <rostedt@goodmis.org>, Ben Segall <bsegall@google.com>,
	Mel Gorman <mgorman@suse.de>, bristot <bristot@redhat.com>,
	Borislav Petkov <bp@alien8.de>, x86 <x86@kernel.org>,
	"H. Peter Anvin" <hpa@zytor.com>, Jens Axboe <axboe@kernel.dk>,
	Alasdair Kergon <agk@redhat.com>,
	Mike Snitzer <snitzer@redhat.com>,
	dm-devel@redhat.com, "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Felipe Balbi <balbi@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Tejun Heo <tj@kernel.org>, Zefan Li <liz>
Subject: Re: [PATCH 3/6] sched,perf,kvm: Fix preemption condition
Date: Wed, 2 Jun 2021 09:59:07 -0400 (EDT)	[thread overview]
Message-ID: <1873020549.5854.1622642347895.JavaMail.zimbra@efficios.com> (raw)
In-Reply-To: <20210602133040.398289363@infradead.org>

----- On Jun 2, 2021, at 9:12 AM, Peter Zijlstra peterz@infradead.org wrote:

> When ran from the sched-out path (preempt_notifier or perf_event),
> p->state is irrelevant to determine preemption. You can get preempted
> with !task_is_running() just fine.
> 
> The right indicator for preemption is if the task is still on the
> runqueue in the sched-out path.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> kernel/events/core.c |    7 +++----
> virt/kvm/kvm_main.c  |    2 +-
> 2 files changed, 4 insertions(+), 5 deletions(-)
> 
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -8568,13 +8568,12 @@ static void perf_event_switch(struct tas
> 		},
> 	};
> 
> -	if (!sched_in && task->state == TASK_RUNNING)
> +	if (!sched_in && current->on_rq) {

This changes from checking task->state to current->on_rq, but this change
from "task" to "current" is not described in the commit message, which is odd.

Are we really sure that task == current here ?

Thanks,

Mathieu

> 		switch_event.event_id.header.misc |=
> 				PERF_RECORD_MISC_SWITCH_OUT_PREEMPT;
> +	}
> 
> -	perf_iterate_sb(perf_event_switch_output,
> -		       &switch_event,
> -		       NULL);
> +	perf_iterate_sb(perf_event_switch_output, &switch_event, NULL);
> }
> 
> /*
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -4869,7 +4869,7 @@ static void kvm_sched_out(struct preempt
> {
> 	struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
> 
> -	if (current->state == TASK_RUNNING) {
> +	if (current->on_rq) {
> 		WRITE_ONCE(vcpu->preempted, true);
> 		WRITE_ONCE(vcpu->ready, true);
>  	}

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com

  reply	other threads:[~2021-06-02 13:59 UTC|newest]

Thread overview: 94+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02 13:12 [PATCH 0/6] sched: Cleanup task_struct::state Peter Zijlstra
2021-06-02 13:12 ` Peter Zijlstra
2021-06-02 13:12 ` [dm-devel] " Peter Zijlstra
2021-06-02 13:12 ` [PATCH 1/6] sched: Unbreak wakeups Peter Zijlstra
2021-06-02 13:12   ` Peter Zijlstra
2021-06-02 13:12   ` [dm-devel] " Peter Zijlstra
2021-06-02 13:58   ` Greg Kroah-Hartman
2021-06-02 13:58     ` Greg Kroah-Hartman
2021-06-02 13:58     ` [dm-devel] " Greg Kroah-Hartman
2021-06-02 14:47   ` Will Deacon
2021-06-02 14:47     ` Will Deacon
2021-06-02 14:47     ` [dm-devel] " Will Deacon
2021-06-02 19:43   ` Davidlohr Bueso
2021-06-02 19:43     ` Davidlohr Bueso
2021-06-02 19:43     ` [dm-devel] " Davidlohr Bueso
2021-06-02 13:12 ` [PATCH 2/6] sched: Introduce task_is_running() Peter Zijlstra
2021-06-02 13:12   ` Peter Zijlstra
2021-06-02 13:12   ` [dm-devel] " Peter Zijlstra
2021-06-02 14:59   ` Will Deacon
2021-06-02 14:59     ` Will Deacon
2021-06-02 14:59     ` [dm-devel] " Will Deacon
2021-06-02 16:46     ` Peter Zijlstra
2021-06-02 16:46       ` Peter Zijlstra
2021-06-02 16:46       ` [dm-devel] " Peter Zijlstra
2021-06-02 23:15   ` Davidlohr Bueso
2021-06-02 23:15     ` Davidlohr Bueso
2021-06-02 23:15     ` [dm-devel] " Davidlohr Bueso
2021-06-02 13:12 ` [PATCH 3/6] sched,perf,kvm: Fix preemption condition Peter Zijlstra
2021-06-02 13:12   ` Peter Zijlstra
2021-06-02 13:12   ` [dm-devel] " Peter Zijlstra
2021-06-02 13:59   ` Mathieu Desnoyers [this message]
2021-06-02 13:59     ` Mathieu Desnoyers
2021-06-02 13:59     ` [dm-devel] [PATCH 3/6] sched, perf, kvm: " Mathieu Desnoyers
2021-06-02 13:59     ` [PATCH 3/6] sched,perf,kvm: " Mathieu Desnoyers
2021-06-02 14:10     ` Peter Zijlstra
2021-06-02 14:10       ` Peter Zijlstra
2021-06-02 14:10       ` [dm-devel] [PATCH 3/6] sched, perf, kvm: " Peter Zijlstra
2021-06-02 14:30       ` [PATCH 3/6] sched,perf,kvm: " Mark Rutland
2021-06-02 14:30         ` Mark Rutland
2021-06-02 14:30         ` [dm-devel] [PATCH 3/6] sched, perf, kvm: " Mark Rutland
2021-06-02 14:15   ` [PATCH 3/6] sched,perf,kvm: " Mathieu Desnoyers
2021-06-02 14:15     ` Mathieu Desnoyers
2021-06-02 14:15     ` [dm-devel] [PATCH 3/6] sched, perf, kvm: " Mathieu Desnoyers
2021-06-02 14:15     ` [PATCH 3/6] sched,perf,kvm: " Mathieu Desnoyers
2021-06-02 14:23     ` Peter Zijlstra
2021-06-02 14:23       ` Peter Zijlstra
2021-06-02 14:23       ` [dm-devel] [PATCH 3/6] sched, perf, kvm: " Peter Zijlstra
2021-06-02 13:12 ` [PATCH 4/6] sched: Add get_current_state() Peter Zijlstra
2021-06-02 13:12   ` Peter Zijlstra
2021-06-02 13:12   ` [dm-devel] " Peter Zijlstra
2021-06-02 14:01   ` Mathieu Desnoyers
2021-06-02 14:01     ` Mathieu Desnoyers
2021-06-02 14:01     ` [dm-devel] " Mathieu Desnoyers
2021-06-02 14:01     ` Mathieu Desnoyers
2021-06-02 14:12     ` Peter Zijlstra
2021-06-02 14:12       ` Peter Zijlstra
2021-06-02 14:12       ` [dm-devel] " Peter Zijlstra
2021-06-02 15:02   ` Will Deacon
2021-06-02 15:02     ` Will Deacon
2021-06-02 15:02     ` [dm-devel] " Will Deacon
2021-06-02 13:12 ` [PATCH 5/6] sched,timer: Use __set_current_state() Peter Zijlstra
2021-06-02 13:12   ` Peter Zijlstra
2021-06-02 13:12   ` [dm-devel] " Peter Zijlstra
2021-06-02 15:06   ` Will Deacon
2021-06-02 15:06     ` Will Deacon
2021-06-02 15:06     ` [dm-devel] " Will Deacon
2021-06-02 19:54   ` Davidlohr Bueso
2021-06-02 19:54     ` Davidlohr Bueso
2021-06-02 19:54     ` [dm-devel] " Davidlohr Bueso
2021-06-03  6:39     ` Peter Zijlstra
2021-06-03  6:39       ` [dm-devel] " Peter Zijlstra
2021-06-03  6:39     ` Peter Zijlstra
2021-06-18 20:42   ` Thomas Gleixner
2021-06-18 20:42     ` Thomas Gleixner
2021-06-18 20:42     ` [dm-devel] " Thomas Gleixner
2021-06-02 13:12 ` [PATCH 6/6] sched: Change task_struct::state Peter Zijlstra
2021-06-02 13:12   ` Peter Zijlstra
2021-06-02 13:12   ` [dm-devel] " Peter Zijlstra
2021-06-02 14:06   ` Mathieu Desnoyers
2021-06-02 14:06     ` Mathieu Desnoyers
2021-06-02 14:06     ` [dm-devel] " Mathieu Desnoyers
2021-06-02 14:06     ` Mathieu Desnoyers
2021-06-02 14:20     ` Peter Zijlstra
2021-06-02 14:20       ` Peter Zijlstra
2021-06-02 14:20       ` [dm-devel] " Peter Zijlstra
2021-06-02 15:10   ` Will Deacon
2021-06-02 15:10     ` Will Deacon
2021-06-02 15:10     ` [dm-devel] " Will Deacon
2021-06-07 10:45   ` Daniel Thompson
2021-06-07 10:45     ` Daniel Thompson
2021-06-07 10:45     ` [dm-devel] " Daniel Thompson
2021-06-07 11:10     ` Peter Zijlstra
2021-06-07 11:10       ` Peter Zijlstra
2021-06-07 11:10       ` [dm-devel] " Peter Zijlstra

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