/proc/stat IRQ info what the number mean?

[wega007]

Looking at the man page of /proc/stat

the defination is

irq - time servicing interrupts (since 2.6.0-test4); softirq - time servicing softirqs (since 2.6.0-test4).

does irq = software irq + hardware irq? if so, the numbers don't seem look right. using the below thread info to compute the numbers
CPU load high, top processes very low? - LinuxQuestions.org

is irq = hardware irq?

what does it mean? Anyone can explain?

[wega007]

On an embedded system (kernal 2.6.21), when I cat /proc/stat I noticed there are 10 columns on the CPU. I google around but I am unable to find info. What are these values? Are the last 2 in addition to the orginal 8 (kernal 2.6.11)?

-------------
cpu 16118 0 9479 654 0 282 6 0 0 2
cpu0 16118 0 9479 654 0 282 6 0 0 2
intr 170000 0 0 0 0 0 0 0 0 0 0 103 0 0 2289 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 26539 0 0 0 138381 186 0 0 2175 0 0 0 0 0 0 0 327 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ctxt 950940
btime 10
processes 616
procs_running 3
procs_blocked 0
pi_init: 0
nr_running(): 3
nr_uninterruptible(): 0
nr_uninterruptible(0): 0
rt_nr_running(): 0
rt_nr_running(0): 0
nr_rt_uninterruptible(): 0
nr_rt_uninterruptible(0): 0

[ndevel]

see man 5 proc or proc. IRQ stands for interrupt request and AFAIK
it covers both i.e. hardware and software.

Regards,
ndevel.

[wega007]

thanx for the reply. However in source kernel/sched.c seem to tell me irq covers Hardware IRQ, not both Hardware & Software.

void account_system_time(struct task_struct *p, int hardirq_offset,
cputime_t cputime)
{
struct cpu_usage_stat *cpustat = &kstat_this_cpu.cpustat;
struct rq *rq = this_rq();
cputime64_t tmp;
p->stime = cputime_add(p->stime, cputime);

/* Add system time to cpustat. */
tmp = cputime_to_cputime64(cputime);
if (hardirq_count() - hardirq_offset)
cpustat->irq = cputime64_add(cpustat->irq, tmp);
else if (softirq_count())
cpustat->softirq = cputime64_add(cpustat->softirq, tmp);
else if (p != rq->idle)
cpustat->system = cputime64_add(cpustat->system, tmp);
else if (atomic_read(&rq->nr_iowait) > 0)
cpustat->iowait = cputime64_add(cpustat->iowait, tmp);
else
cpustat->idle = cputime64_add(cpustat->idle, tmp);
/* Account for system time used */
acct_update_integrals(p);
}