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-rw-r--r--Documentation/filesystems/proc.txt30
-rw-r--r--arch/x86/kernel/apic_32.c1
-rw-r--r--arch/x86/kernel/apic_64.c1
-rw-r--r--arch/x86/kernel/cpu/mcheck/p4.c1
-rw-r--r--arch/x86/kernel/irq_32.c31
-rw-r--r--arch/x86/kernel/irq_64.c30
-rw-r--r--arch/x86/kernel/mce_amd_64.c1
-rw-r--r--arch/x86/kernel/mce_intel_64.c1
-rw-r--r--arch/x86/kernel/smp_32.c3
-rw-r--r--arch/x86/kernel/smp_64.c3
-rw-r--r--arch/x86/mach-voyager/voyager_smp.c1
-rw-r--r--arch/x86/xen/smp.c1
-rw-r--r--include/asm-x86/hardirq_32.h5
-rw-r--r--include/asm-x86/pda.h6
14 files changed, 110 insertions, 5 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 4a37e25e694c..e5c1df52a876 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -347,7 +347,35 @@ connects the CPUs in a SMP system. This means that an error has been detected,
the IO-APIC automatically retry the transmission, so it should not be a big
problem, but you should read the SMP-FAQ.
-In this context it could be interesting to note the new irq directory in 2.4.
+In 2.6.2* /proc/interrupts was expanded again. This time the goal was for
+/proc/interrupts to display every IRQ vector in use by the system, not
+just those considered 'most important'. The new vectors are:
+
+ THR -- interrupt raised when a machine check threshold counter
+ (typically counting ECC corrected errors of memory or cache) exceeds
+ a configurable threshold. Only available on some systems.
+
+ TRM -- a thermal event interrupt occurs when a temperature threshold
+ has been exceeded for the CPU. This interrupt may also be generated
+ when the temperature drops back to normal.
+
+ SPU -- a spurious interrupt is some interrupt that was raised then lowered
+ by some IO device before it could be fully processed by the APIC. Hence
+ the APIC sees the interrupt but does not know what device it came from.
+ For this case the APIC will generate the interrupt with a IRQ vector
+ of 0xff. This might also be generated by chipset bugs.
+
+ RES, CAL, TLB -- rescheduling, call and TLB flush interrupts are
+ sent from one CPU to another per the needs of the OS. Typically,
+ their statistics are used by kernel developers and interested users to
+ determine the occurance of interrupt of the given type.
+
+The above IRQ vectors are displayed only when relevent. For example,
+the threshold vector does not exist on x86_64 platforms. Others are
+suppressed when the system is a uniprocessor. As of this writing, only
+i386 and x86_64 platforms support the new IRQ vector displays.
+
+Of some interest is the introduction of the /proc/irq directory to 2.4.
It could be used to set IRQ to CPU affinity, this means that you can "hook" an
IRQ to only one CPU, or to exclude a CPU of handling IRQs. The contents of the
irq subdir is one subdir for each IRQ, and one file; prof_cpu_mask
diff --git a/arch/x86/kernel/apic_32.c b/arch/x86/kernel/apic_32.c
index 3d67ae18d762..793341fffc81 100644
--- a/arch/x86/kernel/apic_32.c
+++ b/arch/x86/kernel/apic_32.c
@@ -1277,6 +1277,7 @@ void smp_spurious_interrupt(struct pt_regs *regs)
/* see sw-dev-man vol 3, chapter 7.4.13.5 */
printk(KERN_INFO "spurious APIC interrupt on CPU#%d, "
"should never happen.\n", smp_processor_id());
+ __get_cpu_var(irq_stat).irq_spurious_count++;
irq_exit();
}
diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index 2250c654eacc..f47bc493dba9 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1140,6 +1140,7 @@ asmlinkage void smp_spurious_interrupt(void)
if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f)))
ack_APIC_irq();
+ add_pda(irq_spurious_count, 1);
irq_exit();
}
diff --git a/arch/x86/kernel/cpu/mcheck/p4.c b/arch/x86/kernel/cpu/mcheck/p4.c
index 1509edfb2313..be4dabfee1f5 100644
--- a/arch/x86/kernel/cpu/mcheck/p4.c
+++ b/arch/x86/kernel/cpu/mcheck/p4.c
@@ -61,6 +61,7 @@ fastcall void smp_thermal_interrupt(struct pt_regs *regs)
{
irq_enter();
vendor_thermal_interrupt(regs);
+ __get_cpu_var(irq_stat).irq_thermal_count++;
irq_exit();
}
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index e173b763f148..10f359021aae 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -280,14 +280,41 @@ skip:
seq_printf(p, "NMI: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", nmi_count(j));
- seq_putc(p, '\n');
+ seq_printf(p, " Non-maskable interrupts\n");
#ifdef CONFIG_X86_LOCAL_APIC
seq_printf(p, "LOC: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ",
per_cpu(irq_stat,j).apic_timer_irqs);
- seq_putc(p, '\n');
+ seq_printf(p, " Local timer interrupts\n");
#endif
+#ifdef CONFIG_SMP
+ seq_printf(p, "RES: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_resched_count);
+ seq_printf(p, " Rescheduling interrupts\n");
+ seq_printf(p, "CAL: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_call_count);
+ seq_printf(p, " function call interrupts\n");
+ seq_printf(p, "TLB: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_tlb_count);
+ seq_printf(p, " TLB shootdowns\n");
+#endif
+ seq_printf(p, "TRM: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_thermal_count);
+ seq_printf(p, " Thermal event interrupts\n");
+ seq_printf(p, "SPU: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ",
+ per_cpu(irq_stat,j).irq_spurious_count);
+ seq_printf(p, " Spurious interrupts\n");
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
#if defined(CONFIG_X86_IO_APIC)
seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 865669efc540..3881189df8ee 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -86,11 +86,37 @@ skip:
seq_printf(p, "NMI: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
- seq_putc(p, '\n');
+ seq_printf(p, " Non-maskable interrupts\n");
seq_printf(p, "LOC: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
- seq_putc(p, '\n');
+ seq_printf(p, " Local timer interrupts\n");
+#ifdef CONFIG_SMP
+ seq_printf(p, "RES: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_resched_count);
+ seq_printf(p, " Rescheduling interrupts\n");
+ seq_printf(p, "CAL: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_call_count);
+ seq_printf(p, " function call interrupts\n");
+ seq_printf(p, "TLB: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_tlb_count);
+ seq_printf(p, " TLB shootdowns\n");
+#endif
+ seq_printf(p, "TRM: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_thermal_count);
+ seq_printf(p, " Thermal event interrupts\n");
+ seq_printf(p, "THR: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_threshold_count);
+ seq_printf(p, " Threshold APIC interrupts\n");
+ seq_printf(p, "SPU: ");
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", cpu_pda(j)->irq_spurious_count);
+ seq_printf(p, " Spurious interrupts\n");
seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
}
return 0;
diff --git a/arch/x86/kernel/mce_amd_64.c b/arch/x86/kernel/mce_amd_64.c
index 805b62b1e0df..0d2afd96aca4 100644
--- a/arch/x86/kernel/mce_amd_64.c
+++ b/arch/x86/kernel/mce_amd_64.c
@@ -237,6 +237,7 @@ asmlinkage void mce_threshold_interrupt(void)
}
}
out:
+ add_pda(irq_threshold_count, 1);
irq_exit();
}
diff --git a/arch/x86/kernel/mce_intel_64.c b/arch/x86/kernel/mce_intel_64.c
index 6551505d8a2c..c17eaf5dd6dd 100644
--- a/arch/x86/kernel/mce_intel_64.c
+++ b/arch/x86/kernel/mce_intel_64.c
@@ -26,6 +26,7 @@ asmlinkage void smp_thermal_interrupt(void)
if (therm_throt_process(msr_val & 1))
mce_log_therm_throt_event(smp_processor_id(), msr_val);
+ add_pda(irq_thermal_count, 1);
irq_exit();
}
diff --git a/arch/x86/kernel/smp_32.c b/arch/x86/kernel/smp_32.c
index eebc6e82576c..791d9f8036ae 100644
--- a/arch/x86/kernel/smp_32.c
+++ b/arch/x86/kernel/smp_32.c
@@ -342,6 +342,7 @@ fastcall void smp_invalidate_interrupt(struct pt_regs *regs)
smp_mb__after_clear_bit();
out:
put_cpu_no_resched();
+ __get_cpu_var(irq_stat).irq_tlb_count++;
}
void native_flush_tlb_others(const cpumask_t *cpumaskp, struct mm_struct *mm,
@@ -640,6 +641,7 @@ static void native_smp_send_stop(void)
fastcall void smp_reschedule_interrupt(struct pt_regs *regs)
{
ack_APIC_irq();
+ __get_cpu_var(irq_stat).irq_resched_count++;
}
fastcall void smp_call_function_interrupt(struct pt_regs *regs)
@@ -660,6 +662,7 @@ fastcall void smp_call_function_interrupt(struct pt_regs *regs)
*/
irq_enter();
(*func)(info);
+ __get_cpu_var(irq_stat).irq_call_count++;
irq_exit();
if (wait) {
diff --git a/arch/x86/kernel/smp_64.c b/arch/x86/kernel/smp_64.c
index df4a82812adb..5c2964727d19 100644
--- a/arch/x86/kernel/smp_64.c
+++ b/arch/x86/kernel/smp_64.c
@@ -163,6 +163,7 @@ asmlinkage void smp_invalidate_interrupt(struct pt_regs *regs)
out:
ack_APIC_irq();
cpu_clear(cpu, f->flush_cpumask);
+ add_pda(irq_tlb_count, 1);
}
static void flush_tlb_others(cpumask_t cpumask, struct mm_struct *mm,
@@ -493,6 +494,7 @@ void smp_send_stop(void)
asmlinkage void smp_reschedule_interrupt(void)
{
ack_APIC_irq();
+ add_pda(irq_resched_count, 1);
}
asmlinkage void smp_call_function_interrupt(void)
@@ -514,6 +516,7 @@ asmlinkage void smp_call_function_interrupt(void)
exit_idle();
irq_enter();
(*func)(info);
+ add_pda(irq_call_count, 1);
irq_exit();
if (wait) {
mb();
diff --git a/arch/x86/mach-voyager/voyager_smp.c b/arch/x86/mach-voyager/voyager_smp.c
index 1f86b529dbbb..e4928aa6bdfb 100644
--- a/arch/x86/mach-voyager/voyager_smp.c
+++ b/arch/x86/mach-voyager/voyager_smp.c
@@ -1037,6 +1037,7 @@ smp_call_function_interrupt(void)
*/
irq_enter();
(*func)(info);
+ __get_cpu_var(irq_stat).irq_call_count++;
irq_exit();
if (wait) {
mb();
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 4fa33c27ccb6..6c058585459c 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -356,6 +356,7 @@ static irqreturn_t xen_call_function_interrupt(int irq, void *dev_id)
*/
irq_enter();
(*func)(info);
+ __get_cpu_var(irq_stat).irq_call_count++;
irq_exit();
if (wait) {
diff --git a/include/asm-x86/hardirq_32.h b/include/asm-x86/hardirq_32.h
index 918863530b92..4f85f0f4b563 100644
--- a/include/asm-x86/hardirq_32.h
+++ b/include/asm-x86/hardirq_32.h
@@ -10,6 +10,11 @@ typedef struct {
unsigned int __nmi_count; /* arch dependent */
unsigned int apic_timer_irqs; /* arch dependent */
unsigned int irq0_irqs;
+ unsigned int irq_resched_count;
+ unsigned int irq_call_count;
+ unsigned int irq_tlb_count;
+ unsigned int irq_thermal_count;
+ unsigned int irq_spurious_count;
} ____cacheline_aligned irq_cpustat_t;
DECLARE_PER_CPU(irq_cpustat_t, irq_stat);
diff --git a/include/asm-x86/pda.h b/include/asm-x86/pda.h
index fb49f80eb94f..35962bbe5e72 100644
--- a/include/asm-x86/pda.h
+++ b/include/asm-x86/pda.h
@@ -30,6 +30,12 @@ struct x8664_pda {
struct mm_struct *active_mm;
unsigned apic_timer_irqs;
unsigned irq0_irqs;
+ unsigned irq_resched_count;
+ unsigned irq_call_count;
+ unsigned irq_tlb_count;
+ unsigned irq_thermal_count;
+ unsigned irq_threshold_count;
+ unsigned irq_spurious_count;
} ____cacheline_aligned_in_smp;
extern struct x8664_pda *_cpu_pda[];
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.