Messages in this thread | | | Date | Wed, 26 Sep 2012 10:17:56 +0800 | From | Alex Shi <> | Subject | Re: [PATCH] x86: Distinguish TLB shootdown interrupts from other functions call interrupts |
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On 09/26/2012 10:11 AM, Tomoki Sekiyama wrote:
> Hi Alex, > > On 2012/09/25 11:57, Alex Shi wrote: >> On 09/24/2012 09:37 AM, Alex Shi wrote: >> >>> On 09/20/2012 04:50 PM, Tomoki Sekiyama wrote: >>> >>>> unsigned int irq_resched_count; >>>> unsigned int irq_call_count; >>>> + /* irq_tlb_count is double-counted in irq_call_count, so it must be >>>> + subtracted from irq_call_count when displaying irq_call_count */ >>>> unsigned int irq_tlb_count; >>> >>> Review again this patch, above comments is not kernel compatible format. >>> Could you change it like standard comment format: >>> >>> /* >>> * xxxxxxx >>> * xxxx >>> */ >>> >> >> the 3.6 kernel will closed soon. it will be great to has this patch in. >> So, could you like to refresh your patch with popular comments format? :) > > Fixed patch is below. > Thank you for the review again. >
Acked-by: Alex Shi <alex.shi@intel.com>
> -- > As TLB shootdown requests to other CPU cores are now using function call > interrupts, TLB shootdowns entry in /proc/interrupts is always shown as 0. > > This behavior change was introduced by commit 52aec3308db8 ("x86/tlb: > replace INVALIDATE_TLB_VECTOR by CALL_FUNCTION_VECTOR"). > > This patch reverts TLB shootdowns entry in /proc/interrupts to count TLB > shootdowns separately from the other function call interrupts. > > Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@hitachi.com> > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: "H. Peter Anvin" <hpa@zytor.com> > Cc: Alex Shi <alex.shi@intel.com> > --- > arch/x86/include/asm/hardirq.h | 4 ++++ > arch/x86/kernel/irq.c | 4 ++-- > arch/x86/mm/tlb.c | 2 ++ > 3 files changed, 8 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h > index d3895db..81f04ce 100644 > --- a/arch/x86/include/asm/hardirq.h > +++ b/arch/x86/include/asm/hardirq.h > @@ -18,6 +18,10 @@ typedef struct { > #ifdef CONFIG_SMP > unsigned int irq_resched_count; > unsigned int irq_call_count; > + /* > + * irq_tlb_count is double-counted in irq_call_count, so it must be > + * subtracted from irq_call_count when displaying irq_call_count > + */ > unsigned int irq_tlb_count; > #endif > #ifdef CONFIG_X86_THERMAL_VECTOR > diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c > index d44f782..e4595f1 100644 > --- a/arch/x86/kernel/irq.c > +++ b/arch/x86/kernel/irq.c > @@ -92,7 +92,8 @@ int arch_show_interrupts(struct seq_file *p, int prec) > seq_printf(p, " Rescheduling interrupts\n"); > seq_printf(p, "%*s: ", prec, "CAL"); > for_each_online_cpu(j) > - seq_printf(p, "%10u ", irq_stats(j)->irq_call_count); > + seq_printf(p, "%10u ", irq_stats(j)->irq_call_count - > + irq_stats(j)->irq_tlb_count); > seq_printf(p, " Function call interrupts\n"); > seq_printf(p, "%*s: ", prec, "TLB"); > for_each_online_cpu(j) > @@ -147,7 +148,6 @@ u64 arch_irq_stat_cpu(unsigned int cpu) > #ifdef CONFIG_SMP > sum += irq_stats(cpu)->irq_resched_count; > sum += irq_stats(cpu)->irq_call_count; > - sum += irq_stats(cpu)->irq_tlb_count; > #endif > #ifdef CONFIG_X86_THERMAL_VECTOR > sum += irq_stats(cpu)->irq_thermal_count; > diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c > index 613cd83..2d6d8ed 100644 > --- a/arch/x86/mm/tlb.c > +++ b/arch/x86/mm/tlb.c > @@ -98,6 +98,8 @@ static void flush_tlb_func(void *info) > { > struct flush_tlb_info *f = info; > > + inc_irq_stat(irq_tlb_count); > + > if (f->flush_mm != this_cpu_read(cpu_tlbstate.active_mm)) > return; > >
-- Thanks Alex
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