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| author | Frederic Weisbecker <frederic@kernel.org> | 2019-10-16 04:56:49 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2019-10-29 10:01:11 +0100 |
| commit | e6d5bf3e321ca664d12eb00ceb40bd58987ce8a1 (patch) | |
| tree | dac16c335a2667a47011babbe0e6d50a8d30b4f2 /kernel/sched | |
| parent | sched/cputime: Add vtime idle task state (diff) | |
| download | linux-e6d5bf3e321ca664d12eb00ceb40bd58987ce8a1.tar.xz linux-e6d5bf3e321ca664d12eb00ceb40bd58987ce8a1.zip | |
sched/cputime: Add vtime guest task state
Record guest as a VTIME state instead of guessing it from VTIME_SYS and
PF_VCPU. This is going to simplify the cputime read side especially as
its state machine is going to further expand in order to fully support
kcpustat on nohz_full.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rjw@rjwysocki.net>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Wanpeng Li <wanpengli@tencent.com>
Cc: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Link: https://lkml.kernel.org/r/20191016025700.31277-4-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/cputime.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index 2e885e870aa1..34086afc3518 100644 --- a/kernel/sched/cputime.c +++ b/kernel/sched/cputime.c @@ -733,7 +733,7 @@ static void __vtime_account_kernel(struct task_struct *tsk, struct vtime *vtime) { /* We might have scheduled out from guest path */ - if (tsk->flags & PF_VCPU) + if (vtime->state == VTIME_GUEST) vtime_account_guest(tsk, vtime); else vtime_account_system(tsk, vtime); @@ -788,6 +788,7 @@ void vtime_guest_enter(struct task_struct *tsk) write_seqcount_begin(&vtime->seqcount); vtime_account_system(tsk, vtime); tsk->flags |= PF_VCPU; + vtime->state = VTIME_GUEST; write_seqcount_end(&vtime->seqcount); } EXPORT_SYMBOL_GPL(vtime_guest_enter); @@ -799,6 +800,7 @@ void vtime_guest_exit(struct task_struct *tsk) write_seqcount_begin(&vtime->seqcount); vtime_account_guest(tsk, vtime); tsk->flags &= ~PF_VCPU; + vtime->state = VTIME_SYS; write_seqcount_end(&vtime->seqcount); } EXPORT_SYMBOL_GPL(vtime_guest_exit); @@ -826,6 +828,8 @@ void vtime_task_switch_generic(struct task_struct *prev) write_seqcount_begin(&vtime->seqcount); if (is_idle_task(current)) vtime->state = VTIME_IDLE; + else if (current->flags & PF_VCPU) + vtime->state = VTIME_GUEST; else vtime->state = VTIME_SYS; vtime->starttime = sched_clock(); @@ -860,7 +864,7 @@ u64 task_gtime(struct task_struct *t) seq = read_seqcount_begin(&vtime->seqcount); gtime = t->gtime; - if (vtime->state == VTIME_SYS && t->flags & PF_VCPU) + if (vtime->state == VTIME_GUEST) gtime += vtime->gtime + vtime_delta(vtime); } while (read_seqcount_retry(&vtime->seqcount, seq)); @@ -898,13 +902,13 @@ void task_cputime(struct task_struct *t, u64 *utime, u64 *stime) delta = vtime_delta(vtime); /* - * Task runs either in user or kernel space, add pending nohz time to - * the right place. + * Task runs either in user (including guest) or kernel space, + * add pending nohz time to the right place. */ - if (vtime->state == VTIME_USER || t->flags & PF_VCPU) - *utime += vtime->utime + delta; - else if (vtime->state == VTIME_SYS) + if (vtime->state == VTIME_SYS) *stime += vtime->stime + delta; + else + *utime += vtime->utime + delta; } while (read_seqcount_retry(&vtime->seqcount, seq)); } #endif /* CONFIG_VIRT_CPU_ACCOUNTING_GEN */ |