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([2601:188:c102:b180:1f8b:71d0:77b1:1f6e]) by smtp.gmail.com with ESMTPSA id 71dfb90a1353d-563667cf148sm10043559e0c.2.2026.01.12.10.03.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 12 Jan 2026 10:04:02 -0800 (PST) From: Waiman Long X-Google-Original-From: Waiman Long Message-ID: Date: Mon, 12 Jan 2026 13:03:47 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 05/33] sched/isolation: Save boot defined domain flags To: Frederic Weisbecker , LKML Cc: =?UTF-8?Q?Michal_Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Chen Ridong , Danilo Krummrich , "David S . 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 , 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 References: <20260101221359.22298-1-frederic@kernel.org> <20260101221359.22298-6-frederic@kernel.org> In-Reply-To: <20260101221359.22298-6-frederic@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: FdVavGc_pkM4Z346PrftyzsLwmpVJsRYl1uowm_L9vc_1768241046 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260112_100419_836959_119B249E X-CRM114-Status: GOOD ( 20.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 1/1/26 5:13 PM, Frederic Weisbecker wrote: > 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 > --- > 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); > } Reviewed-by: Waiman Long