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Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Guenter Roeck , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Anna-Maria Behnsen , Ingo Molnar , Thomas Gleixner , Chen Ridong , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-hwmon@vger.kernel.org, rcu@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Costa Shulyupin , Qiliang Yuan , Waiman Long Subject: [PATCH 01/23] sched/isolation: Add HK_TYPE_KERNEL_NOISE_BOOT & HK_TYPE_MANAGED_IRQ_BOOT Date: Mon, 20 Apr 2026 23:03:29 -0400 Message-ID: <20260421030351.281436-2-longman@redhat.com> In-Reply-To: <20260421030351.281436-1-longman@redhat.com> References: <20260421030351.281436-1-longman@redhat.com> Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Since commit 4fca0e550d50 ("sched/isolation: Save boot defined domain flags"), HK_TYPE_DOMAIN_BOOT was added to record the boot time "isolcpus{=domain}" setting. As we are going to make the HK_TYPE_MANAGED_IRQ and HK_TYPE_KERNEL_NOISE housekeeping cpumasks runtime modifiable, we need some additional cpumasks to record the boot time settings to make sure that those housekeeping cpumasks will always be a subset of their boot time equivalents. Introduce the new HK_TYPE_KERNEL_NOISE_BOOT and HK_TYPE_MANAGED_IRQ_BOOT housekeeping types to do that. Signed-off-by: Waiman Long --- include/linux/sched/isolation.h | 16 ++++++++++++++-- kernel/sched/isolation.c | 16 +++++++++------- 2 files changed, 23 insertions(+), 9 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index dc3975ff1b2e..d1707f121e20 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -14,10 +14,22 @@ enum hk_type { * is always a subset of HK_TYPE_DOMAIN_BOOT. */ HK_TYPE_DOMAIN, - /* Inverse of boot-time isolcpus=managed_irq argument */ - HK_TYPE_MANAGED_IRQ, + /* Inverse of boot-time nohz_full= or isolcpus=nohz arguments */ + HK_TYPE_KERNEL_NOISE_BOOT, + /* + * A subset of HK_TYPE_KERNEL_NOISE_BOOT as it may excludes some + * additional isolated CPUs at run time. + */ HK_TYPE_KERNEL_NOISE, + + /* Inverse of boot-time isolcpus=managed_irq argument */ + HK_TYPE_MANAGED_IRQ_BOOT, + /* + * A subset of HK_TYPE_MANAGED_IRQ_BOOT as it may excludes some + * additional isolated CPUs at run time. + */ + HK_TYPE_MANAGED_IRQ, HK_TYPE_MAX, /* diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index a947d75b43f1..9ec9ae510dc7 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -12,10 +12,12 @@ #include "sched.h" enum hk_flags { - HK_FLAG_DOMAIN_BOOT = BIT(HK_TYPE_DOMAIN_BOOT), - HK_FLAG_DOMAIN = BIT(HK_TYPE_DOMAIN), - HK_FLAG_MANAGED_IRQ = BIT(HK_TYPE_MANAGED_IRQ), - HK_FLAG_KERNEL_NOISE = BIT(HK_TYPE_KERNEL_NOISE), + HK_FLAG_DOMAIN_BOOT = BIT(HK_TYPE_DOMAIN_BOOT), + HK_FLAG_DOMAIN = BIT(HK_TYPE_DOMAIN), + HK_FLAG_KERNEL_NOISE_BOOT = BIT(HK_TYPE_KERNEL_NOISE_BOOT), + HK_FLAG_KERNEL_NOISE = BIT(HK_TYPE_KERNEL_NOISE), + HK_FLAG_MANAGED_IRQ_BOOT = BIT(HK_TYPE_MANAGED_IRQ_BOOT), + HK_FLAG_MANAGED_IRQ = BIT(HK_TYPE_MANAGED_IRQ), }; DEFINE_STATIC_KEY_FALSE(housekeeping_overridden); @@ -315,7 +317,7 @@ static int __init housekeeping_nohz_full_setup(char *str) { unsigned long flags; - flags = HK_FLAG_KERNEL_NOISE; + flags = HK_FLAG_KERNEL_NOISE | HK_FLAG_KERNEL_NOISE_BOOT; return housekeeping_setup(str, flags); } @@ -334,7 +336,7 @@ static int __init housekeeping_isolcpus_setup(char *str) */ if (!strncmp(str, "nohz,", 5)) { str += 5; - flags |= HK_FLAG_KERNEL_NOISE; + flags |= HK_FLAG_KERNEL_NOISE | HK_FLAG_KERNEL_NOISE_BOOT; continue; } @@ -346,7 +348,7 @@ static int __init housekeeping_isolcpus_setup(char *str) if (!strncmp(str, "managed_irq,", 12)) { str += 12; - flags |= HK_FLAG_MANAGED_IRQ; + flags |= HK_FLAG_MANAGED_IRQ | HK_FLAG_MANAGED_IRQ_BOOT; continue; } -- 2.53.0