starlingx/kernel
Code Issues Proposed changes
kernel/kernel-rt/centos/patches/0003-affine-compute-kernel-threads.patch
Jiping Ma 2cb3d041cd Upgrade to 5.10 Linux kernel. 
Move to kernel version 5.10 using source from the Yocto Project.
1. Add STX patches for kernel 5.10.
2. Support git source for linux-yocto.
3. Add build_srpm from build-tools/default_build_srpm
   and modified for git repo from yocto
4. Modify std and rt config files.
5. Build python-perf instead of python3-perf for std kernel.
   python-perf is needed by tuned-2.8.0-5.el7.noarch.
6. Modify rt spec to build out package kernel-rt-tools and kernel-rt-kvm.
7. Add kernel-5.10.30-x86_64-rt.config.tis_extra and
   kernel-5.10.30-x86_64.config.tis_extra
8. Add a dist field to avoid undesired rebuilds.
9. Ensure -unsigned package is populated

Story: 2008921
Partial-Task: 42519

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Vefa Bicakci <vefa.bicakci@windriver.com>
Signed-off-by: Jiping Ma <jiping.ma2@windriver.com>
Change-Id: Id1f635302f265826f7ff2860a3bed4b7755b2888
2021-07-26 02:40:01 -04:00

170 lines
6.6 KiB
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From c8cf8051b6e4118613fbdfccbca0c4a0c19ec4a5 Mon Sep 17 00:00:00 2001
From: Chris Friesen <chris.friesen@windriver.com>
Date: Tue, 24 Nov 2015 16:27:28 -0500
Subject: [PATCH] affine compute kernel threads
This is a kernel enhancement to configure the cpu affinity of kernel
threads via kernel boot option kthread_cpus=<cpulist>. The compute
kickstart file and compute-huge.sh scripts will update grub with the
new option.
With kthread_cpus specified, the cpumask is immediately applied upon
thread launch. This does not affect kernel threads that specify cpu
and node.
Note: this is based off of Christoph Lameter's patch at
https://lwn.net/Articles/565932/ with the only difference being
the kernel parameter changed from kthread to kthread_cpus.
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Chris Friesen <chris.friesen@windriver.com>
[VT: The existing "isolcpus"
kernel bootarg, cgroup/cpuset, and taskset might provide the some
way to have cpu isolation. However none of them satisfies the requirements.
Replacing spaces with tabs. Combine two calls of set_cpus_allowed_ptr()
in kernel_init_freeable() in init/main.c into one. Performed tests]
Signed-off-by: Vu Tran <vu.tran@windriver.com>
Signed-off-by: Jim Somerville <Jim.Somerville@windriver.com>
Signed-off-by: Zhang Zhiguo <zhangzhg@neusoft.com>
Signed-off-by: Vefa Bicakci <vefa.bicakci@windriver.com>
[jm: Adapted the patch for context changes.]
Signed-off-by: Jiping Ma <jiping.ma2@windriver.com>
---
.../admin-guide/kernel-parameters.txt | 10 ++++++++++
include/linux/cpumask.h | 3 +++
init/main.c | 2 ++
kernel/cpu.c | 19 +++++++++++++++++++
kernel/kthread.c | 4 ++--
kernel/umh.c | 3 +++
6 files changed, 39 insertions(+), 2 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 5a241afb4728..78a923d087c1 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2217,6 +2217,16 @@
See also Documentation/trace/kprobetrace.rst "Kernel
Boot Parameter" section.
+ kthread_cpus= [KNL, SMP] Only run kernel threads on the specified
+ list of processors. The kernel will start threads
+ on the indicated processors only (unless there
+ are specific reasons to run a thread with
+ different affinities). This can be used to make
+ init start on certain processors and also to
+ control where kmod and other user space threads
+ are being spawned. Allows to keep kernel threads
+ away from certain cores unless absoluteluy necessary.
+
kpti= [ARM64] Control page table isolation of user
and kernel address spaces.
Default: enabled on cores which need mitigation.
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 383684e30f12..8fcc67ea3d8c 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -55,6 +55,7 @@ extern unsigned int nr_cpu_ids;
* cpu_present_mask - has bit 'cpu' set iff cpu is populated
* cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
* cpu_active_mask - has bit 'cpu' set iff cpu available to migration
+ * cpu_kthread_mask - has bit 'cpu' set iff general kernel threads allowed
*
* If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
*
@@ -91,10 +92,12 @@ extern struct cpumask __cpu_possible_mask;
extern struct cpumask __cpu_online_mask;
extern struct cpumask __cpu_present_mask;
extern struct cpumask __cpu_active_mask;
+extern struct cpumask __cpu_kthread_mask;
#define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
#define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
#define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
#define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
+#define cpu_kthread_mask ((const struct cpumask *)&__cpu_kthread_mask)
extern atomic_t __num_online_cpus;
diff --git a/init/main.c b/init/main.c
index 0e4cc913695e..df9759f2859b 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1542,6 +1542,8 @@ static noinline void __init kernel_init_freeable(void)
do_basic_setup();
+ set_cpus_allowed_ptr(current, cpu_kthread_mask);
+
kunit_run_all_tests();
console_on_rootfs();
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 4e11e91010e1..52aa0ee41352 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2456,6 +2456,25 @@ EXPORT_SYMBOL(__cpu_active_mask);
atomic_t __num_online_cpus __read_mostly;
EXPORT_SYMBOL(__num_online_cpus);
+struct cpumask __cpu_kthread_mask __read_mostly
+ = {CPU_BITS_ALL};
+EXPORT_SYMBOL(__cpu_kthread_mask);
+
+static int __init kthread_setup(char *str)
+{
+ struct cpumask tmp_mask;
+ int err;
+
+ err = cpulist_parse(str, &tmp_mask);
+ if (!err)
+ cpumask_copy(&__cpu_kthread_mask, &tmp_mask);
+ else
+ pr_err("Cannot parse 'kthread_cpus=%s'; error %d\n", str, err);
+
+ return 1;
+}
+__setup("kthread_cpus=", kthread_setup);
+
void init_cpu_present(const struct cpumask *src)
{
cpumask_copy(&__cpu_present_mask, src);
diff --git a/kernel/kthread.c b/kernel/kthread.c
index cdfaf64263b3..251a753c852e 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -279,7 +279,7 @@ static int kthread(void *_create)
* back to default in case they have been changed.
*/
sched_setscheduler_nocheck(current, SCHED_NORMAL, &param);
- set_cpus_allowed_ptr(current, housekeeping_cpumask(HK_FLAG_KTHREAD));
+ set_cpus_allowed_ptr(current, cpu_kthread_mask);
/* OK, tell user we're spawned, wait for stop or wakeup */
__set_current_state(TASK_UNINTERRUPTIBLE);
@@ -634,7 +634,7 @@ int kthreadd(void *unused)
/* Setup a clean context for our children to inherit. */
set_task_comm(tsk, "kthreadd");
ignore_signals(tsk);
- set_cpus_allowed_ptr(tsk, housekeeping_cpumask(HK_FLAG_KTHREAD));
+ set_cpus_allowed_ptr(tsk, cpu_kthread_mask);
set_mems_allowed(node_states[N_MEMORY]);
current->flags |= PF_NOFREEZE;
diff --git a/kernel/umh.c b/kernel/umh.c
index 3f646613a9d3..e5027cee43f7 100644
--- a/kernel/umh.c
+++ b/kernel/umh.c
@@ -80,6 +80,9 @@ static int call_usermodehelper_exec_async(void *data)
*/
current->fs->umask = 0022;
+ /* We can run only where init is allowed to run. */
+ set_cpus_allowed_ptr(current, cpu_kthread_mask);
+
/*
* Our parent (unbound workqueue) runs with elevated scheduling
* priority. Avoid propagating that into the userspace child.
--
2.31.1
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