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author | rstone <rstone@FreeBSD.org> | 2012-02-04 16:49:29 +0000 |
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committer | rstone <rstone@FreeBSD.org> | 2012-02-04 16:49:29 +0000 |
commit | d657a808e177a73e0f680643e066f3ca02c98da1 (patch) | |
tree | 9fb3b23e2f35704a30c1a17ad930aeddf15034b3 /sys/kern | |
parent | 43b86196041e12d95f309bcd2d915e182e9b4013 (diff) | |
download | FreeBSD-src-d657a808e177a73e0f680643e066f3ca02c98da1.zip FreeBSD-src-d657a808e177a73e0f680643e066f3ca02c98da1.tar.gz |
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
Diffstat (limited to 'sys/kern')
-rw-r--r-- | sys/kern/kern_kthread.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/kern/kern_kthread.c b/sys/kern/kern_kthread.c index bb12469..dc3fdab 100644 --- a/sys/kern/kern_kthread.c +++ b/sys/kern/kern_kthread.c @@ -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 *arg, /* 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 *arg, struct proc *p, 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); |