From: Thomas Gleixner tglx@linutronix.de
[ Upstream commit 1136b0728969901a091f0471968b2b76ed14d9ad ]
Waiman reported that on large systems with a large amount of interrupts the readout of /proc/stat takes a long time to sum up the interrupt statistics. In principle this is not a problem. but for unknown reasons some enterprise quality software reads /proc/stat with a high frequency.
The reason for this is that interrupt statistics are accounted per cpu. So the /proc/stat logic has to sum up the interrupt stats for each interrupt.
This can be largely avoided for interrupts which are not marked as 'PER_CPU' interrupts by simply adding a per interrupt summation counter which is incremented along with the per interrupt per cpu counter.
The PER_CPU interrupts need to avoid that and use only per cpu accounting because they share the interrupt number and the interrupt descriptor and concurrent updates would conflict or require unwanted synchronization.
Reported-by: Waiman Long longman@redhat.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Reviewed-by: Waiman Long longman@redhat.com Reviewed-by: Marc Zyngier marc.zyngier@arm.com Reviewed-by: Davidlohr Bueso dbueso@suse.de Cc: Matthew Wilcox willy@infradead.org Cc: Andrew Morton akpm@linux-foundation.org Cc: Alexey Dobriyan adobriyan@gmail.com Cc: Kees Cook keescook@chromium.org Cc: linux-fsdevel@vger.kernel.org Cc: Davidlohr Bueso dave@stgolabs.net Cc: Miklos Szeredi miklos@szeredi.hu Cc: Daniel Colascione dancol@google.com Cc: Dave Chinner david@fromorbit.com Cc: Randy Dunlap rdunlap@infradead.org Link: https://lkml.kernel.org/r/20190208135020.925487496@linutronix.de
8<-------------
v2: Undo the unintentional layout change of struct irq_desc.
include/linux/irqdesc.h | 1 + kernel/irq/chip.c | 12 ++++++++++-- kernel/irq/internals.h | 8 +++++++- kernel/irq/irqdesc.c | 7 ++++++- 4 files changed, 24 insertions(+), 4 deletions(-)
Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/irqdesc.h | 1 + kernel/irq/chip.c | 12 ++++++++++-- kernel/irq/internals.h | 8 +++++++- kernel/irq/irqdesc.c | 7 ++++++- 4 files changed, 24 insertions(+), 4 deletions(-)
diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h index b6084898d330..234f0d1f8dca 100644 --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -65,6 +65,7 @@ struct irq_desc { unsigned int core_internal_state__do_not_mess_with_it; unsigned int depth; /* nested irq disables */ unsigned int wake_depth; /* nested wake enables */ + unsigned int tot_count; unsigned int irq_count; /* For detecting broken IRQs */ unsigned long last_unhandled; /* Aging timer for unhandled count */ unsigned int irqs_unhandled; diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 5a2ef92c2782..0fa7ef74303b 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -834,7 +834,11 @@ void handle_percpu_irq(struct irq_desc *desc) { struct irq_chip *chip = irq_desc_get_chip(desc);
- kstat_incr_irqs_this_cpu(desc); + /* + * PER CPU interrupts are not serialized. Do not touch + * desc->tot_count. + */ + __kstat_incr_irqs_this_cpu(desc);
if (chip->irq_ack) chip->irq_ack(&desc->irq_data); @@ -863,7 +867,11 @@ void handle_percpu_devid_irq(struct irq_desc *desc) unsigned int irq = irq_desc_get_irq(desc); irqreturn_t res;
- kstat_incr_irqs_this_cpu(desc); + /* + * PER CPU interrupts are not serialized. Do not touch + * desc->tot_count. + */ + __kstat_incr_irqs_this_cpu(desc);
if (chip->irq_ack) chip->irq_ack(&desc->irq_data); diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h index 44ed5f8c8759..4ef7f3b820ce 100644 --- a/kernel/irq/internals.h +++ b/kernel/irq/internals.h @@ -240,12 +240,18 @@ static inline void irq_state_set_masked(struct irq_desc *desc)
#undef __irqd_to_state
-static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) +static inline void __kstat_incr_irqs_this_cpu(struct irq_desc *desc) { __this_cpu_inc(*desc->kstat_irqs); __this_cpu_inc(kstat.irqs_sum); }
+static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc) +{ + __kstat_incr_irqs_this_cpu(desc); + desc->tot_count++; +} + static inline int irq_desc_get_node(struct irq_desc *desc) { return irq_common_data_get_node(&desc->irq_common_data); diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index e97bbae947f0..c2bfb11a9d05 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -119,6 +119,7 @@ static void desc_set_defaults(unsigned int irq, struct irq_desc *desc, int node, desc->depth = 1; desc->irq_count = 0; desc->irqs_unhandled = 0; + desc->tot_count = 0; desc->name = NULL; desc->owner = owner; for_each_possible_cpu(cpu) @@ -895,11 +896,15 @@ unsigned int kstat_irqs_cpu(unsigned int irq, int cpu) unsigned int kstat_irqs(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); - int cpu; unsigned int sum = 0; + int cpu;
if (!desc || !desc->kstat_irqs) return 0; + if (!irq_settings_is_per_cpu_devid(desc) && + !irq_settings_is_per_cpu(desc)) + return desc->tot_count; + for_each_possible_cpu(cpu) sum += *per_cpu_ptr(desc->kstat_irqs, cpu); return sum;