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From: Shrikanth Hegde <sshegde@linux.ibm.com>
To: linux-kernel@vger.kernel.org, mingo@kernel.org,
	peterz@infradead.org, juri.lelli@redhat.com,
	vincent.guittot@linaro.org, yury.norov@gmail.com,
	kprateek.nayak@amd.com, iii@linux.ibm.com, corbet@lwn.net
Cc: sshegde@linux.ibm.com, tglx@kernel.org,
	gregkh@linuxfoundation.org, pbonzini@redhat.com,
	seanjc@google.com, vschneid@redhat.com, huschle@linux.ibm.com,
	rostedt@goodmis.org, dietmar.eggemann@arm.com,
	maddy@linux.ibm.com, srikar@linux.ibm.com, hdanton@sina.com,
	chleroy@kernel.org, vineeth@bitbyteword.org, frederic@kernel.org,
	arighi@nvidia.com, pauld@redhat.com, christian.loehle@arm.com,
	tj@kernel.org, tommaso.cucinotta@gmail.com, maz@kernel.org,
	rafael@kernel.org, rdunlap@infradead.org, kernellwp@gmail.com,
	linux-doc@vger.kernel.org
Subject: [PATCH v5 15/24] virt/steal_monitor: Restore to active on module disable
Date: Thu, 25 Jun 2026 18:16:39 +0530	[thread overview]
Message-ID: <20260625124648.802832-16-sshegde@linux.ibm.com> (raw)
In-Reply-To: <20260625124648.802832-1-sshegde@linux.ibm.com>

When the module is not in use, preferred CPUs must be same
as active CPUs.

Even if one disables the module during high steal time, it
still restores the preferred CPUs to be same as active CPUs
to keep disable path simple.

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
---
v4->v5:
- Modified for steal_monitor

 drivers/virt/steal_monitor/sm_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/virt/steal_monitor/sm_core.c b/drivers/virt/steal_monitor/sm_core.c
index e320559c6576..b1865fcdff93 100644
--- a/drivers/virt/steal_monitor/sm_core.c
+++ b/drivers/virt/steal_monitor/sm_core.c
@@ -23,6 +23,7 @@ static int __init steal_monitor_init(void)
 static void __exit steal_monitor_exit(void)
 {
 	pr_info("steal_monitor is disabled\n");
+	cpumask_copy(&__cpu_preferred_mask, cpu_active_mask);
 }
 
 module_init(steal_monitor_init);
-- 
2.47.3


  parent reply	other threads:[~2026-06-25 12:49 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-25 12:46 [PATCH v5 00/24] sched: Introduce cpu_preferred_mask and steal-driven vCPU backoff Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 01/24] sched/debug: Remove unused schedstats Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 02/24] sched/docs: Document cpu_preferred_mask and Preferred CPU concept Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 03/24] kconfig: Provide PREFERRED_CPU option Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 04/24] cpumask: Introduce cpu_preferred_mask Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 05/24] sysfs: Add preferred CPU file Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 06/24] sched/core: allow only preferred CPUs in is_cpu_allowed Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 07/24] sched/fair: Select preferred CPU at wakeup when possible Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 08/24] sched/fair: load balance only among preferred CPUs Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 09/24] sched/fair: Pull the load on preferred CPU Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 10/24] sched/core: Keep tick on non-preferred CPUs until tasks are out Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 11/24] sched/core: Push current task from non preferred CPU Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 12/24] sched/debug: Add migration stats due to non preferred CPUs Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 13/24] virt/steal_monitor: Add documentation Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 14/24] virt: Introduce steal monitor driver Shrikanth Hegde
2026-06-25 12:46 ` Shrikanth Hegde [this message]
2026-06-25 12:46 ` [PATCH v5 16/24] virt/steal_monitor: Define steal_monitor structure Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 17/24] virt/steal_monitor: Add control knobs for handling steal values Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 18/24] virt/steal_monitor: Compute work at regular intervals Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 19/24] virt/steal_monitor: Provide default method to get systemwide steal time Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 20/24] virt/steal_monitor: Provide default method to inc/dec preferred CPUs Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 21/24] virt/steal_monitor: Provide default method to get num of CPUs for steal ratio Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 22/24] virt/steal_monitor: Act on steal values at regular intervals Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 23/24] virt/steal_monitor: Add direction control Shrikanth Hegde
2026-06-25 12:46 ` [PATCH v5 24/24] virt/steal_monitor: Add design check of preferred subset of active Shrikanth Hegde

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