Author: rstone
Date: Sat Mar 10 02:27:04 2012
New Revision: 232757
URL: http://svn.freebsd.org/changeset/base/232757
Log:
MFC r230984:
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.
Modified:
stable/8/sys/kern/kern_kthread.c
Directory Properties:
stable/8/sys/ (props changed)
Modified: stable/8/sys/kern/kern_kthread.c
==============================================================================
--- stable/8/sys/kern/kern_kthread.c Sat Mar 10 02:26:12 2012
(r232756)
+++ stable/8/sys/kern/kern_kthread.c Sat Mar 10 02:27:04 2012
(r232757)
@@ -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>
@@ -116,6 +117,9 @@ 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);
@@ -300,6 +304,9 @@ kthread_add(void (*func)(void *), void *
PROC_UNLOCK(p);
+ /* 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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