Author: rstone
Date: Sat Feb 4 16:49:29 2012
New Revision: 230984
URL: http://svn.freebsd.org/changeset/base/230984
Log:
Whenever a new kernel thread is spawned, explicitly clear any CPU affinity
set on the new thread. This prevents the thread from inadvertently
inheriting affinity from a random sibling.
Submitted by: attilio
Tested by: pho
MFC after: 1 week
Modified:
head/sys/kern/kern_kthread.c
Modified: head/sys/kern/kern_kthread.c
==============================================================================
--- head/sys/kern/kern_kthread.c Sat Feb 4 15:43:16 2012
(r230983)
+++ head/sys/kern/kern_kthread.c Sat Feb 4 16:49:29 2012
(r230984)
@@ -29,6 +29,7 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
+#include <sys/cpuset.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/mutex.h>
@@ -117,6 +118,9 @@ kproc_create(void (*func)(void *), void
/* call the processes' main()... */
cpu_set_fork_handler(td, func, arg);
+
+ /* Avoid inheriting affinity from a random parent. */
+ cpuset_setthread(td->td_tid, cpuset_root);
thread_lock(td);
TD_SET_CAN_RUN(td);
sched_prio(td, PVM);
@@ -299,6 +303,9 @@ kthread_add(void (*func)(void *), void *
tidhash_add(newtd);
+ /* Avoid inheriting affinity from a random parent. */
+ cpuset_setthread(newtd->td_tid, cpuset_root);
+
/* Delay putting it on the run queue until now. */
if (!(flags & RFSTOPPED)) {
thread_lock(newtd);
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