From: Nitesh Narayan Lal <nitesh@redhat.com>
To: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
linux-pci@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
frederic@kernel.org, mtosatti@redhat.com, sassmann@redhat.com,
jesse.brandeburg@intel.com, lihong.yang@intel.com,
helgaas@kernel.org, nitesh@redhat.com,
jeffrey.t.kirsher@intel.com, jacob.e.keller@intel.com,
jlelli@redhat.com, hch@infradead.org, bhelgaas@google.com,
mike.marciniszyn@intel.com, dennis.dalessandro@intel.com,
thomas.lendacky@amd.com, jerinj@marvell.com,
mathias.nyman@intel.com, jiri@nvidia.com, mingo@redhat.com,
peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org
Subject: [PATCH v2 2/4] sched/isolation: Extend nohz_full to isolate managed IRQs
Date: Wed, 23 Sep 2020 14:11:24 -0400 [thread overview]
Message-ID: <20200923181126.223766-3-nitesh@redhat.com> (raw)
In-Reply-To: <20200923181126.223766-1-nitesh@redhat.com>
Extend nohz_full feature set to include isolation from managed IRQS. This
is required specifically for setups that only uses nohz_full and still
requires isolation for maintaining lower latency for the listed CPUs.
Having this change will ensure that the kernel functions that were using
HK_FLAG_MANAGED_IRQ to derive cpumask for pinning various jobs/IRQs do not
enqueue anything on the CPUs listed under nohz_full.
Suggested-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
---
kernel/sched/isolation.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 5a6ea03f9882..9df9598a9e39 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -141,7 +141,7 @@ static int __init housekeeping_nohz_full_setup(char *str)
unsigned int flags;
flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU |
- HK_FLAG_MISC | HK_FLAG_KTHREAD;
+ HK_FLAG_MISC | HK_FLAG_KTHREAD | HK_FLAG_MANAGED_IRQ;
return housekeeping_setup(str, flags);
}
--
2.18.2
next prev parent reply other threads:[~2020-09-23 18:18 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 18:11 [PATCH v2 0/4] isolation: limit msix vectors based on housekeeping CPUs Nitesh Narayan Lal
2020-09-23 18:11 ` [PATCH v2 1/4] sched/isolation: API to get housekeeping online CPUs Nitesh Narayan Lal
2020-09-24 8:40 ` peterz
2020-09-24 12:09 ` Frederic Weisbecker
2020-09-24 12:23 ` Nitesh Narayan Lal
2020-09-24 12:24 ` Peter Zijlstra
2020-09-24 12:11 ` Frederic Weisbecker
2020-09-24 12:26 ` Nitesh Narayan Lal
2020-09-24 12:46 ` Peter Zijlstra
2020-09-24 13:45 ` Nitesh Narayan Lal
2020-09-24 20:47 ` Bjorn Helgaas
2020-09-24 21:52 ` Nitesh Narayan Lal
2020-09-23 18:11 ` Nitesh Narayan Lal [this message]
2020-09-23 18:11 ` [PATCH v2 3/4] i40e: limit msix vectors based on housekeeping CPUs Nitesh Narayan Lal
2020-09-23 18:11 ` [PATCH v2 4/4] PCI: Limit pci_alloc_irq_vectors as per " Nitesh Narayan Lal
2020-09-24 20:45 ` Bjorn Helgaas
2020-09-24 21:39 ` Nitesh Narayan Lal
2020-09-24 22:59 ` Bjorn Helgaas
2020-09-24 23:40 ` Nitesh Narayan Lal
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