Re: [patch v2 04/14] x86/irq: Make irqstats array based

[Thomas Gleixner <tglx@kernel.org>]

On Wed, Mar 25 2026 at 15:20, Radu Rendec wrote:
> On Tue, 2026-03-24 at 16:32 -0400, Radu Rendec wrote:
>
> I tested it, and it's very close but requires a few extra changes,
> which I included as a patch at the bottom.

All of this is overly complicated. That can directly use the
irq_stat_info array and therefore stays always in sync without ever
touching that python nightmare again.

Replacement patch below (works only after 5/14 obviously).

> There's one more gotcha: in the next patch (patch 5) you rename nr_irqs
> to total_nr_irqs, and the change must be applied to interrupts.py as
> well. It's used at the beginning of the LxInterruptList.invoke()
> function.

Sigh, yes. This GDB python insanity is a pain, debugging it even more so.

Thanks,

        tglx
---
diff --git a/scripts/gdb/linux/interrupts.py b/scripts/gdb/linux/interrupts.py
index f4f715a8f0e3..7fde52317e84 100644
--- a/scripts/gdb/linux/interrupts.py
+++ b/scripts/gdb/linux/interrupts.py
@@ -97,13 +97,13 @@ def show_irq_err_count(prec):
         text += "%*s: %10u\n" % (prec, "ERR", cnt['counter'])
     return text
 
-def x86_show_irqstat(prec, pfx, field, desc):
-    irq_stat = gdb.parse_and_eval("&irq_stat")
+def x86_show_irqstat(prec, pfx, idx, desc):
+    irq_stat = gdb.parse_and_eval("&irq_stat.counts[%d]" %idx)
     text = "%*s: " % (prec, pfx)
     for cpu in cpus.each_online_cpu():
         stat = cpus.per_cpu(irq_stat, cpu)
-        text += "%10u " % (stat[field])
-    text += "  %s\n" % (desc)
+        text += "%10u " % (stat.dereference())
+    text += desc
     return text
 
 def x86_show_mce(prec, var, pfx, desc):
@@ -115,34 +115,14 @@ def x86_show_mce(prec, var, pfx, desc):
     return text
 
 def x86_show_interupts(prec):
-    text = x86_show_irqstat(prec, "NMI", '__nmi_count', 'Non-maskable interrupts')
-
-    if constants.LX_CONFIG_X86_LOCAL_APIC:
-        text += x86_show_irqstat(prec, "LOC", 'apic_timer_irqs', "Local timer interrupts")
-        text += x86_show_irqstat(prec, "SPU", 'irq_spurious_count', "Spurious interrupts")
-        text += x86_show_irqstat(prec, "PMI", 'apic_perf_irqs', "Performance monitoring interrupts")
-        text += x86_show_irqstat(prec, "IWI", 'apic_irq_work_irqs', "IRQ work interrupts")
-        text += x86_show_irqstat(prec, "RTR", 'icr_read_retry_count', "APIC ICR read retries")
-        if utils.gdb_eval_or_none("x86_platform_ipi_callback") is not None:
-            text += x86_show_irqstat(prec, "PLT", 'x86_platform_ipis', "Platform interrupts")
-
-    if constants.LX_CONFIG_SMP:
-        text += x86_show_irqstat(prec, "RES", 'irq_resched_count', "Rescheduling interrupts")
-        text += x86_show_irqstat(prec, "CAL", 'irq_call_count', "Function call interrupts")
-        text += x86_show_irqstat(prec, "TLB", 'irq_tlb_count', "TLB shootdowns")
-
-    if constants.LX_CONFIG_X86_THERMAL_VECTOR:
-        text += x86_show_irqstat(prec, "TRM", 'irq_thermal_count', "Thermal events interrupts")
+    info_type = gdb.lookup_type('struct irq_stat_info')
+    info = gdb.parse_and_eval('irq_stat_info')
 
-    if constants.LX_CONFIG_X86_MCE_THRESHOLD:
-        text += x86_show_irqstat(prec, "THR", 'irq_threshold_count', "Threshold APIC interrupts")
-
-    if constants.LX_CONFIG_X86_MCE_AMD:
-        text += x86_show_irqstat(prec, "DFR", 'irq_deferred_error_count', "Deferred Error APIC interrupts")
-
-    if constants.LX_CONFIG_X86_MCE:
-        text += x86_show_mce(prec, "&mce_exception_count", "MCE", "Machine check exceptions")
-        text += x86_show_mce(prec, "&mce_poll_count", "MCP", "Machine check polls")
+    text = ""
+    for idx in range(int(info.type.sizeof / info_type.sizeof)):
+        pfx = info[idx]['symbol'].string()
+        desc = info[idx]['text'].string()
+        text += x86_show_irqstat(prec, pfx, idx, desc)
 
     text += show_irq_err_count(prec)
 
@@ -151,11 +131,6 @@ def x86_show_interupts(prec):
         if cnt is not None:
             text += "%*s: %10u\n" % (prec, "MIS", cnt['counter'])
 
-    if constants.LX_CONFIG_KVM:
-        text += x86_show_irqstat(prec, "PIN", 'kvm_posted_intr_ipis', 'Posted-interrupt notification event')
-        text += x86_show_irqstat(prec, "NPI", 'kvm_posted_intr_nested_ipis', 'Nested posted-interrupt event')
-        text += x86_show_irqstat(prec, "PIW", 'kvm_posted_intr_wakeup_ipis', 'Posted-interrupt wakeup event')
-
     return text
 
 def arm_common_show_interrupts(prec):
@@ -209,7 +184,7 @@ class LxInterruptList(gdb.Command):
         super(LxInterruptList, self).__init__("lx-interruptlist", gdb.COMMAND_DATA)
 
     def invoke(self, arg, from_tty):
-        nr_irqs = gdb.parse_and_eval("nr_irqs")
+        nr_irqs = gdb.parse_and_eval("total_nr_irqs")
         prec = 3
         j = 1000
         while prec < 10 and j <= nr_irqs: