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-rw-r--r--kernel/sched/cputime.c16
1 files changed, 11 insertions, 5 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 58624a65f124..a95097cb4591 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -258,16 +258,22 @@ static __always_inline bool steal_account_process_tick(void)
{
#ifdef CONFIG_PARAVIRT
if (static_key_false(&paravirt_steal_enabled)) {
- u64 steal, st = 0;
+ u64 steal;
+ cputime_t steal_ct;
steal = paravirt_steal_clock(smp_processor_id());
steal -= this_rq()->prev_steal_time;
- st = steal_ticks(steal);
- this_rq()->prev_steal_time += st * TICK_NSEC;
+ /*
+ * cputime_t may be less precise than nsecs (eg: if it's
+ * based on jiffies). Lets cast the result to cputime
+ * granularity and account the rest on the next rounds.
+ */
+ steal_ct = nsecs_to_cputime(steal);
+ this_rq()->prev_steal_time += cputime_to_nsecs(steal_ct);
- account_steal_time(st);
- return st;
+ account_steal_time(steal_ct);
+ return steal_ct;
}
#endif
return false;