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Subject[PATCH 1/3] Added new Proc entry to display per-cpu interrupts
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As the number of cores increases the output of the /proc/interrupts losing the readability.

I think instead of showing complete information of all cores in a single proc file spliting the
information based on per-CPU will be more useful (especially for people who wants to track
per-cpu information in real-time systems).

It is just a base version and works only for X86 (Copy pasted the output below)

Please let me know your opinions on this (Based on that I will try to make it work for all arch).

On a 24-core machine output of /proc/interrupts is not readable.

root@localhost:~# cat /proc/interrupts
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 CPU8 CPU9 CPU10 CPU11 CPU12 CPU13 CPU14 CPU15 CPU16 CPU17 CPU18 CPU19 CPU20 CPU21 CPU22 CPU23
0: 1305 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IO-APIC-edge timer
4: 3077 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IO-APIC-edge serial
8: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IO-APIC-edge rtc0
9: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IO-APIC-fasteoi acpi
14: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 IO-APIC-edge ata_piix


Newly added proc entries output.

[sasikantha@localhost Desktop]$ cat /proc/cpu/
0/ 1/
[sasikantha@localhost Desktop]$ cat /proc/cpu/0/interrupts
CPU0
0: 1122723 IO-APIC-edge timer
1: 45534 IO-APIC-edge i8042
4: 2 IO-APIC-edge
7: 0 IO-APIC-edge parport0
8: 0 IO-APIC-edge rtc0
9: 0 IO-APIC-fasteoi acpi
12: 444699 IO-APIC-edge i8042
14: 223211 IO-APIC-edge ata_piix
15: 0 IO-APIC-edge ata_piix
16: 10 IO-APIC-fasteoi uhci_hcd:usb3, uhci_hcd:usb8, eth1
18: 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
19: 0 IO-APIC-fasteoi uhci_hcd:usb6
21: 0 IO-APIC-fasteoi uhci_hcd:usb4
23: 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
42: 95394 PCI-MSI-edge i915
43: 0 PCI-MSI-edge eth0
44: 253 PCI-MSI-edge snd_hda_intel
NMI: 0 Non-maskable interrupts
LOC: 10618394 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
IWI: 0 IRQ work interrupts
RTR: 0 APIC ICR read retries
RES: 1108550 Rescheduling interrupts
CAL: 223 Function call interrupts
TLB: 20763 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
MCE: 0 Machine check exceptions
MCP: 54 Machine check polls
ERR: 0
MIS: 0
[sasikantha@localhost Desktop]$ cat /proc/cpu/1/interrupts
CPU1
0: 1101722 IO-APIC-edge timer
1: 15 IO-APIC-edge i8042
4: 1 IO-APIC-edge
7: 0 IO-APIC-edge parport0
8: 1 IO-APIC-edge rtc0
9: 0 IO-APIC-fasteoi acpi
12: 65 IO-APIC-edge i8042
14: 200909 IO-APIC-edge ata_piix
15: 0 IO-APIC-edge ata_piix
16: 2875246 IO-APIC-fasteoi uhci_hcd:usb3, uhci_hcd:usb8, eth1
18: 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
19: 0 IO-APIC-fasteoi uhci_hcd:usb6
21: 0 IO-APIC-fasteoi uhci_hcd:usb4
42: 26 PCI-MSI-edge i915
43: 0 PCI-MSI-edge eth0
44: 72904 PCI-MSI-edge snd_hda_intel
NMI: 0 Non-maskable interrupts
LOC: 9635490 Local timer interrupts
SPU: 0 Spurious interrupts
PMI: 0 Performance monitoring interrupts
IWI: 0 IRQ work interrupts
RTR: 0 APIC ICR read retries
RES: 1216863 Rescheduling interrupts
CAL: 412 Function call interrupts
TLB: 21671 TLB shootdowns
TRM: 0 Thermal event interrupts
THR: 0 Threshold APIC interrupts
MCE: 0 Machine check exceptions
MCP: 54 Machine check polls
ERR: 0
MIS: 0


Did not touch the existing /proc/ininterrupts

[sasikantha@localhost Desktop]$ cat /proc/interrupts
CPU0 CPU1
0: 1122889 1101729 IO-APIC-edge timer
1: 45700 15 IO-APIC-edge i8042
4: 2 1 IO-APIC-edge
7: 0 0 IO-APIC-edge parport0
8: 0 1 IO-APIC-edge rtc0
9: 0 0 IO-APIC-fasteoi acpi
12: 444699 65 IO-APIC-edge i8042
14: 223560 200967 IO-APIC-edge ata_piix
15: 0 0 IO-APIC-edge ata_piix
16: 10 2908377 IO-APIC-fasteoi uhci_hcd:usb3, uhci_hcd:usb8, eth1
18: 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb7
19: 0 0 IO-APIC-fasteoi uhci_hcd:usb6
21: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
23: 0 0 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5
42: 95409 26 PCI-MSI-edge i915
43: 0 0 PCI-MSI-edge eth0
44: 253 72929 PCI-MSI-edge snd_hda_intel
NMI: 0 0 Non-maskable interrupts
LOC: 10627890 9640400 Local timer interrupts
SPU: 0 0 Spurious interrupts
PMI: 0 0 Performance monitoring interrupts
IWI: 0 0 IRQ work interrupts
RTR: 0 0 APIC ICR read retries
RES: 1113218 1220968 Rescheduling interrupts
CAL: 224 412 Function call interrupts
TLB: 20763 21671 TLB shootdowns
TRM: 0 0 Thermal event interrupts
THR: 0 0 Threshold APIC interrupts
MCE: 0 0 Machine check exceptions
MCP: 54 54 Machine check polls
ERR: 0
MIS: 0


Signed-off-by: Sasikantha babu <sasikanth.v19@gmail.com>
---
fs/proc/Makefile | 1 +
fs/proc/percpu.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 116 insertions(+), 0 deletions(-)
create mode 100644 fs/proc/percpu.c
diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index c1c7293..3615c72 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -21,6 +21,7 @@ proc-y += uptime.o
proc-y += version.o
proc-y += softirqs.o
proc-y += namespaces.o
+proc-y += percpu.o
proc-$(CONFIG_PROC_SYSCTL) += proc_sysctl.o
proc-$(CONFIG_NET) += proc_net.o
proc-$(CONFIG_PROC_KCORE) += kcore.o
diff --git a/fs/proc/percpu.c b/fs/proc/percpu.c
new file mode 100644
index 0000000..da1d05c
--- /dev/null
+++ b/fs/proc/percpu.c
@@ -0,0 +1,115 @@
+/*
+ * Per CPU-based information
+ * Licensed under the GPL-2 or later
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irqnr.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+
+static struct proc_dir_entry *cpu_base_dir;
+static struct proc_dir_entry *cpu_dir[NR_CPUS];
+
+/*
+ Interrupts proc is based on /proc/interrupts
+*/
+
+/*
+ * /proc/cpu/<number>/interrupts
+ */
+
+static void *int_seq_start(struct seq_file *f, loff_t *pos)
+{
+ return (*pos <= nr_irqs) ? pos : NULL;
+}
+
+static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ (*pos)++;
+ if (*pos > nr_irqs)
+ return NULL;
+ return pos;
+}
+
+static void int_seq_stop(struct seq_file *f, void *v)
+{
+ /* Nothing to do */
+}
+
+static const struct seq_operations int_seq_ops = {
+ .start = int_seq_start,
+ .next = int_seq_next,
+ .stop = int_seq_stop,
+ .show = show_interrupts
+};
+
+static int interrupts_open(struct inode *inode, struct file *filp)
+{
+ int ret;
+ ret = seq_open(filp, &int_seq_ops);
+
+ if (!ret) {
+ struct seq_file *m = filp->private_data;
+ m->private = PDE(inode)->data;
+ }
+ return ret;
+
+}
+
+static const struct file_operations proc_intr_ops = {
+ .open = interrupts_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+
+static void __exit proc_per_cpu_exit (void)
+{
+ int cpu = 0;
+ char name [10];
+
+ for_each_present_cpu (cpu) {
+ if (cpu_dir[cpu]) {
+ sprintf(name, "%d", cpu);
+ remove_proc_entry ("interrupts", cpu_dir[cpu]);
+ remove_proc_entry (name, cpu_base_dir);
+ }
+ }
+ remove_proc_entry ("cpu", NULL);
+}
+
+static int __init proc_per_cpu_init (void)
+{
+ int cpu;
+ char name [10];
+
+ cpu_base_dir = proc_mkdir("cpu", NULL);
+
+ if (!cpu_base_dir)
+ return -1;
+
+ for_each_present_cpu (cpu) {
+ sprintf(name, "%d", cpu);
+ cpu_dir[cpu] = proc_mkdir(name, cpu_base_dir);
+ if (!cpu_dir[cpu])
+ goto out_remove_dir;
+ /*XXX:Storing the CPU number as private data for simplicty,
+ I may be wrong ?*/
+ proc_create_data ("interrupts", 0, cpu_dir[cpu], &proc_intr_ops,
+ (void *)(cpu + 1));
+ }
+
+ return 0;
+
+out_remove_dir:
+ proc_per_cpu_exit ();
+ return -1;
+}
+
+module_exit(proc_per_cpu_exit);
+module_init(proc_per_cpu_init);
--
1.7.3.4


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