The patch titled
x86: expand /proc/interrupts to include missing vectors
has been removed from the -mm tree. Its filename was
expand-proc-interrupts-to-include-missing-vectors-v3.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: x86: expand /proc/interrupts to include missing vectors
From: Joe Korty <joe.korty@xxxxxxxx>
added documentation
merged some #ifdef CONFIG_SMP's
Signed-off-by: Joe Korty <joe.korty@xxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 32 ++++++++++++++++++++++++++-
arch/i386/kernel/irq.c | 4 ---
arch/x86_64/kernel/irq.c | 4 ---
3 files changed, 31 insertions(+), 9 deletions(-)
diff -puN Documentation/filesystems/proc.txt~expand-proc-interrupts-to-include-missing-vectors-v3 Documentation/filesystems/proc.txt
--- a/Documentation/filesystems/proc.txt~expand-proc-interrupts-to-include-missing-vectors-v3
+++ a/Documentation/filesystems/proc.txt
@@ -347,7 +347,37 @@ connects the CPUs in a SMP system. This
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 -- a threshold interrupt occurs when ECC memory correction is
+ occuring at too high a frequency. Threshold interrupt machinery is
+ often put into the ECC logic, as occasional ECC memory failures are
+ part of normal memory operation, but sequences of ECC failures over
+ some short interval usually indicate a memory chip that is about to fail.
+
+ TRM -- a thermal event interrupt occurs when a temperature threshold
+ has been exceeded for some CPU chip. 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.
+
+ 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 floods 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 -puN arch/i386/kernel/irq.c~expand-proc-interrupts-to-include-missing-vectors-v3 arch/i386/kernel/irq.c
--- a/arch/i386/kernel/irq.c~expand-proc-interrupts-to-include-missing-vectors-v3
+++ a/arch/i386/kernel/irq.c
@@ -298,15 +298,11 @@ skip:
seq_printf(p, "%10u ",
per_cpu(irq_stat,j).irq_resched_counts);
seq_printf(p, " Rescheduling interrupts\n");
-#endif
-#ifdef CONFIG_SMP
seq_printf(p, "CAL: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ",
per_cpu(irq_stat,j).irq_call_counts);
seq_printf(p, " function call interrupts\n");
-#endif
-#ifdef CONFIG_SMP
seq_printf(p, "TLB: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ",
diff -puN arch/x86_64/kernel/irq.c~expand-proc-interrupts-to-include-missing-vectors-v3 arch/x86_64/kernel/irq.c
--- a/arch/x86_64/kernel/irq.c~expand-proc-interrupts-to-include-missing-vectors-v3
+++ a/arch/x86_64/kernel/irq.c
@@ -98,14 +98,10 @@ skip:
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->irq_resched_counts);
seq_printf(p, " Rescheduling interrupts\n");
-#endif
-#ifdef CONFIG_SMP
seq_printf(p, "CAL: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->irq_call_counts);
seq_printf(p, " function call interrupts\n");
-#endif
-#ifdef CONFIG_SMP
seq_printf(p, "TLB: ");
for_each_online_cpu(j)
seq_printf(p, "%10u ", cpu_pda(j)->irq_tlb_counts);
_
Patches currently in -mm which might be from joe.korty@xxxxxxxx are
-
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
