From: Quentin Perret <qperret@google.com>
To: Thara Gopinath <thara.gopinath@linaro.org>
Cc: mingo@redhat.com, peterz@infradead.org, ionela.voinescu@arm.com,
vincent.guittot@linaro.org, rui.zhang@intel.com,
edubezval@gmail.com, linux-kernel@vger.kernel.org,
amit.kachhap@gmail.com, javi.merino@kernel.org,
daniel.lezcano@linaro.org
Subject: Re: [Patch v3 7/7] sched: thermal: Enable tuning of decay period
Date: Tue, 15 Oct 2019 11:14:52 +0100 [thread overview]
Message-ID: <20191015101452.GA237548@google.com> (raw)
In-Reply-To: <1571014705-19646-8-git-send-email-thara.gopinath@linaro.org>
Hi Thara,
On Sunday 13 Oct 2019 at 20:58:25 (-0400), Thara Gopinath wrote:
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 00fcea2..5056c08 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -376,6 +376,13 @@ static struct ctl_table kern_table[] = {
> .mode = 0644,
> .proc_handler = proc_dointvec,
> },
> + {
> + .procname = "sched_thermal_decay_coeff",
> + .data = &sysctl_sched_thermal_decay_coeff,
> + .maxlen = sizeof(unsigned int),
> + .mode = 0644,
> + .proc_handler = proc_dointvec,
Perhaps change this for 'sched_proc_update_handler' with min and max
values ? Otherwise userspace is allowed to write nonsensical values
here. And since sysctl_sched_thermal_decay_coeff is used to shift, this
can lead to an undefined behaviour.
Also, could we take this sysctl out of SCHED_DEBUG ? I expect this to be
used/tuned on production devices where SCHED_DEBUG should theoretically
be off.
Thanks,
Quentin
next prev parent reply other threads:[~2019-10-15 10:15 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-14 0:58 [Patch v3 0/7] Introduce Thermal Pressure Thara Gopinath
2019-10-14 0:58 ` [Patch v3 1/7] sched/pelt.c: Add support to track thermal pressure Thara Gopinath
2019-10-14 13:55 ` Vincent Guittot
2019-10-16 21:15 ` Thara Gopinath
2019-10-14 0:58 ` [Patch v3 2/7] sched: Add infrastructure to store and update instantaneous " Thara Gopinath
2019-10-14 15:50 ` Vincent Guittot
2019-10-16 21:22 ` Thara Gopinath
2019-10-17 8:44 ` Vincent Guittot
2019-10-17 16:40 ` Thara Gopinath
2019-10-18 8:05 ` Vincent Guittot
2019-10-14 0:58 ` [Patch v3 3/7] sched: Initialize per cpu thermal pressure structure Thara Gopinath
2019-10-14 0:58 ` [Patch v3 4/7] sched/fair: Enable CFS periodic tick to update thermal pressure Thara Gopinath
2019-10-14 0:58 ` [Patch v3 5/7] sched/fair: update cpu_capcity to reflect " Thara Gopinath
2019-10-14 0:58 ` [Patch v3 6/7] thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping Thara Gopinath
2019-10-14 0:58 ` [Patch v3 7/7] sched: thermal: Enable tuning of decay period Thara Gopinath
2019-10-15 10:14 ` Quentin Perret [this message]
2019-10-21 21:03 ` Thara Gopinath
2019-10-22 9:03 ` Quentin Perret
2019-10-22 20:36 ` Thara Gopinath
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