Re: [PATCH 3/3] time: drop local_irq_save/restore from irqtime_account_irq
On 11/07/2016 18:53, r...@redhat.com wrote: > From: Rik van Riel> > Paolo pointed out that irqs are already blocked when irqtime_account_irq > is called. That means there is no reason to call local_irq_save/restore > again. > > Signed-off-by: Rik van Riel > Suggested-by: Paolo Bonzini > --- > kernel/sched/cputime.c | 4 > 1 file changed, 4 deletions(-) > > diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c > index ca7e33cb0967..7b6fa4d7ad4c 100644 > --- a/kernel/sched/cputime.c > +++ b/kernel/sched/cputime.c > @@ -49,15 +49,12 @@ DEFINE_PER_CPU(seqcount_t, irq_time_seq); > */ > void irqtime_account_irq(struct task_struct *curr) > { > - unsigned long flags; > s64 delta; > int cpu; > > if (!sched_clock_irqtime) > return; > > - local_irq_save(flags); > - > cpu = smp_processor_id(); > delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time); > __this_cpu_add(irq_start_time, delta); > @@ -75,7 +72,6 @@ void irqtime_account_irq(struct task_struct *curr) > __this_cpu_add(cpu_softirq_time, delta); > > irq_time_write_end(); > - local_irq_restore(flags); > } > EXPORT_SYMBOL_GPL(irqtime_account_irq); > > Reviewed-by: Paolo Bonzini
Re: [PATCH 3/3] time: drop local_irq_save/restore from irqtime_account_irq
On 11/07/2016 18:53, r...@redhat.com wrote: > From: Rik van Riel > > Paolo pointed out that irqs are already blocked when irqtime_account_irq > is called. That means there is no reason to call local_irq_save/restore > again. > > Signed-off-by: Rik van Riel > Suggested-by: Paolo Bonzini > --- > kernel/sched/cputime.c | 4 > 1 file changed, 4 deletions(-) > > diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c > index ca7e33cb0967..7b6fa4d7ad4c 100644 > --- a/kernel/sched/cputime.c > +++ b/kernel/sched/cputime.c > @@ -49,15 +49,12 @@ DEFINE_PER_CPU(seqcount_t, irq_time_seq); > */ > void irqtime_account_irq(struct task_struct *curr) > { > - unsigned long flags; > s64 delta; > int cpu; > > if (!sched_clock_irqtime) > return; > > - local_irq_save(flags); > - > cpu = smp_processor_id(); > delta = sched_clock_cpu(cpu) - __this_cpu_read(irq_start_time); > __this_cpu_add(irq_start_time, delta); > @@ -75,7 +72,6 @@ void irqtime_account_irq(struct task_struct *curr) > __this_cpu_add(cpu_softirq_time, delta); > > irq_time_write_end(); > - local_irq_restore(flags); > } > EXPORT_SYMBOL_GPL(irqtime_account_irq); > > Reviewed-by: Paolo Bonzini