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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2017-10-04 14:46:17 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-10-16 08:19:01 +0200 |
| commit | b7662eef14caf4f582d453d45395825b5a8f594c (patch) | |
| tree | 6266a88bfe567fd2b64ff6991882887feac93c73 /arch/s390 | |
| parent | ff5abbe799e29099695cb8b5b2f198dd8b8bdf26 (diff) | |
| download | linux-b7662eef14caf4f582d453d45395825b5a8f594c.tar.bz2 | |
s390/cputime: fix guest/irq/softirq times after CPU hotplug
On CPU hotplug some cpu stats contain bogus values:
$ cat /proc/stat
cpu 0 0 49 1280 0 0 0 3 0 0
cpu0 0 0 49 618 0 0 0 3 0 0
cpu1 0 0 0 662 0 0 0 0 0 0
[...]
$ echo 0 > /sys/devices/system/cpu/cpu1/online
$ echo 1 > /sys/devices/system/cpu/cpu1/online
$ cat /proc/stat
cpu 0 0 49 3200 0 450359962737 450359962737 3 0 0
cpu0 0 0 49 1956 0 0 0 3 0 0
cpu1 0 0 0 1244 0 450359962737 450359962737 0 0 0
[...]
pcpu_attach_task() needs the same assignments as vtime_task_switch.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: b7394a5f4ce9 ("sched/cputime, s390: Implement delayed accounting of system time")
Cc: stable@vger.kernel.org # 4.11+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kernel/smp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 1cee6753d47a..495ff6959dec 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -293,7 +293,10 @@ static void pcpu_attach_task(struct pcpu *pcpu, struct task_struct *tsk) lc->lpp = LPP_MAGIC; lc->current_pid = tsk->pid; lc->user_timer = tsk->thread.user_timer; + lc->guest_timer = tsk->thread.guest_timer; lc->system_timer = tsk->thread.system_timer; + lc->hardirq_timer = tsk->thread.hardirq_timer; + lc->softirq_timer = tsk->thread.softirq_timer; lc->steal_timer = 0; } |