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Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 05/33] sched/isolation: Save boot defined domain flags Date: Sun, 25 Jan 2026 23:45:12 +0100 Message-ID: <20260125224541.50226-6-frederic@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20260125224541.50226-1-frederic@kernel.org> References: <20260125224541.50226-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 708B94000E X-Stat-Signature: jz6r6fs3hrh1ubohdsn7sytorj4ky9fs X-HE-Tag: 1769381193-130787 X-HE-Meta: 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 KLOz/Q6w /WOj981KxoeFn4Y5mcaTVaZdkhkaIBlhyPqpM9RXsMbje7ke4NArifg0ed/l9dsENO7Dlyx2MDQWaQlcDfIlOVe1L5gW+4pC89/xbvVi0CwnKRaBNHDqkLBCu3ddSKl3aiBKros5LIscs2K1RxQwVCsT6pVMdx9/hCqtwNHtBz6KeBllRtkW8GDfMGXsd/90ZtynYHCWTgedSo8Liky94BhpDJuMNhkfkHrh41hPm4ggOHNZlW0z3g7FVsWY7b3hmwbZpq6BxI8JxpWAnKVFjuTywILwVj/nDv6Ld X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: HK_TYPE_DOMAIN will soon integrate not only boot defined isolcpus= CPUs but also cpuset isolated partitions. Housekeeping still needs a way to record what was initially passed to isolcpus= in order to keep these CPUs isolated after a cpuset isolated partition is modified or destroyed while containing some of them. Create a new HK_TYPE_DOMAIN_BOOT to keep track of those. Signed-off-by: Frederic Weisbecker Reviewed-by: Phil Auld Reviewed-by: Waiman Long --- include/linux/sched/isolation.h | 4 ++++ kernel/sched/isolation.c | 5 +++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.h index d8501f4709b5..c7cf6934489c 100644 --- a/include/linux/sched/isolation.h +++ b/include/linux/sched/isolation.h @@ -7,8 +7,12 @@ #include enum hk_type { + /* Inverse of boot-time isolcpus= argument */ + 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, HK_TYPE_MAX, diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c index 3ad0d6df6a0a..11a623fa6320 100644 --- a/kernel/sched/isolation.c +++ b/kernel/sched/isolation.c @@ -11,6 +11,7 @@ #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), @@ -239,7 +240,7 @@ static int __init housekeeping_isolcpus_setup(char *str) if (!strncmp(str, "domain,", 7)) { str += 7; - flags |= HK_FLAG_DOMAIN; + flags |= HK_FLAG_DOMAIN | HK_FLAG_DOMAIN_BOOT; continue; } @@ -269,7 +270,7 @@ static int __init housekeeping_isolcpus_setup(char *str) /* Default behaviour for isolcpus without flags */ if (!flags) - flags |= HK_FLAG_DOMAIN; + flags |= HK_FLAG_DOMAIN | HK_FLAG_DOMAIN_BOOT; return housekeeping_setup(str, flags); } -- 2.51.1