lkml.org 
[lkml]   [2017]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 10/12] housekeeping: Affine unbound kthreads
Date
We want to be able to force the kthreads affinity when we'll repinplement
isolcpus= on top of housekeeping. Unfortunately many kthreads also
override their own affinity so we may need to revisit some of them.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Wanpeng Li <kernellwp@gmail.com>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
---
include/linux/housekeeping.h | 1 +
kernel/kthread.c | 5 +++--
2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/housekeeping.h b/include/linux/housekeeping.h
index 0959601..2a9b808 100644
--- a/include/linux/housekeeping.h
+++ b/include/linux/housekeeping.h
@@ -11,6 +11,7 @@ enum hk_flags {
HK_FLAG_MISC = (1 << 2),
HK_FLAG_SCHED = (1 << 3),
HK_FLAG_WORKQUEUE = (1 << 4),
+ HK_FLAG_KTHREAD = (1 << 5),
};

#ifdef CONFIG_CPU_ISOLATION
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 26db528..d4f1e63 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -21,6 +21,7 @@
#include <linux/ptrace.h>
#include <linux/uaccess.h>
#include <linux/cgroup.h>
+#include <linux/housekeeping.h>
#include <trace/events/sched.h>

static DEFINE_SPINLOCK(kthread_create_lock);
@@ -317,7 +318,7 @@ struct task_struct *__kthread_create_on_node(int (*threadfn)(void *data),
* The kernel thread should not inherit these properties.
*/
sched_setscheduler_nocheck(task, SCHED_NORMAL, &param);
- set_cpus_allowed_ptr(task, cpu_all_mask);
+ set_cpus_allowed_ptr(task, housekeeping_cpumask(HK_FLAG_KTHREAD));
}
kfree(create);
return task;
@@ -536,7 +537,7 @@ 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, cpu_all_mask);
+ set_cpus_allowed_ptr(tsk, housekeeping_cpumask(HK_FLAG_KTHREAD));
set_mems_allowed(node_states[N_MEMORY]);

current->flags |= PF_NOFREEZE;
--
2.7.4
\
 
 \ /
  Last update: 2017-08-23 03:52    [W:0.149 / U:2.576 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site