From: Greg KH <gregkh@linuxfoundation.org>
To: Shrikanth Hegde <sshegde@linux.ibm.com>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, tglx@linutronix.de,
yury.norov@gmail.com, maddy@linux.ibm.com, srikar@linux.ibm.com,
pbonzini@redhat.com, seanjc@google.com, kprateek.nayak@amd.com,
vschneid@redhat.com, iii@linux.ibm.com, huschle@linux.ibm.com,
rostedt@goodmis.org, dietmar.eggemann@arm.com,
christophe.leroy@csgroup.eu
Subject: Re: [PATCH 16/17] sysfs: Provide write method for paravirt
Date: Mon, 24 Nov 2025 18:04:48 +0100 [thread overview]
Message-ID: <2025112409-rockstar-shortcake-1892@gregkh> (raw)
In-Reply-To: <20251119124449.1149616-17-sshegde@linux.ibm.com>
On Wed, Nov 19, 2025 at 06:14:48PM +0530, Shrikanth Hegde wrote:
> This is a debug patch which could be used to set the range of CPUs as
> paravirt.
>
> One could make use of this for quick testing of this infra instead of writing
> arch specific code. This allows checking some corner cases by providing custom
> cpumasks which isn't possible with arch method.
>
> echo 100-200,600-700 > /sys/devices/system/cpu/paravirt
> cat /sys/devices/system/cpu/paravirt
> 100-200,600-700
>
> echo > /sys/devices/system/cpu/paravirt
> cat /sys/devices/system/cpu/paravirt
>
> Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
> ---
> This is currently not meant be merged, since paravirt sysfs file is meant
> to be Read-Only. Hence the documentation hasn't changed. If this method is
> really helpful, then can consider including it depending on the
> discussion.
As you added this to this series, if it is picked up, it WILL be merged
:(
Please try a "Nacked-by:" or something else to keep patches from being
applied. Or better yet, send them as a totally separate series.
thanks,
greg k-h
next prev parent reply other threads:[~2025-11-24 17:04 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-19 12:44 [PATCH 00/17] Paravirt CPUs and push task for less vCPU preemption Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 01/17] sched/docs: Document cpu_paravirt_mask and Paravirt CPU concept Shrikanth Hegde
2025-11-19 21:48 ` Hillf Danton
2025-11-20 14:54 ` Shrikanth Hegde
2025-11-20 22:56 ` Hillf Danton
2025-11-19 12:44 ` [PATCH 02/17] cpumask: Introduce cpu_paravirt_mask Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 03/17] sched/core: Dont allow to use CPU marked as paravirt Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 04/17] sched/debug: Remove unused schedstats Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 05/17] sched/fair: Add paravirt movements for proc sched file Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 06/17] sched/fair: Pass current cpu in select_idle_sibling Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 07/17] sched/fair: Don't consider paravirt CPUs for wakeup and load balance Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 08/17] sched/rt: Don't select paravirt CPU for wakeup and push/pull rt task Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 09/17] sched/core: Add support for nohz_full CPUs Shrikanth Hegde
2025-11-21 3:16 ` K Prateek Nayak
2025-11-21 4:40 ` Shrikanth Hegde
2025-11-24 4:36 ` K Prateek Nayak
2025-11-19 12:44 ` [PATCH 10/17] sched/core: Push current task from paravirt CPU Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 11/17] sysfs: Add paravirt CPU file Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 12/17] powerpc: method to initialize ec and vp cores Shrikanth Hegde
2025-11-21 8:29 ` kernel test robot
2025-11-21 10:14 ` kernel test robot
2025-11-19 12:44 ` [PATCH 13/17] powerpc: enable/disable paravirt CPUs based on steal time Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 14/17] powerpc: process steal values at fixed intervals Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 15/17] powerpc: add debugfs file for controlling handling on steal values Shrikanth Hegde
2025-11-19 12:44 ` [PATCH 16/17] sysfs: Provide write method for paravirt Shrikanth Hegde
2025-11-24 17:04 ` Greg KH [this message]
2025-11-24 17:24 ` Steven Rostedt
2025-11-25 2:49 ` Shrikanth Hegde
2025-11-25 15:52 ` Steven Rostedt
2025-11-25 16:02 ` Konstantin Ryabitsev
2025-11-25 16:08 ` Steven Rostedt
2025-11-19 12:44 ` [PATCH 17/17] sysfs: disable arch handling if paravirt file being written Shrikanth Hegde
2025-11-24 17:05 ` [PATCH 00/17] Paravirt CPUs and push task for less vCPU preemption Greg KH
2025-11-25 2:39 ` Shrikanth Hegde
2025-11-25 7:48 ` Christophe Leroy (CS GROUP)
2025-11-25 8:48 ` Shrikanth Hegde
2025-11-27 10:44 ` Shrikanth Hegde
2025-12-04 13:28 ` Ilya Leoshkevich
2025-12-05 5:30 ` Shrikanth Hegde
2025-12-15 17:39 ` Yury Norov
2025-12-18 5:22 ` Shrikanth Hegde
2025-12-08 4:47 ` K Prateek Nayak
2025-12-08 9:57 ` Shrikanth Hegde
2025-12-08 17:58 ` K Prateek Nayak
2026-03-26 6:11 ` Shrikanth Hegde
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