When IRQBALANCE_BANNED_CPUS is set, /proc/stat is not parsed properly.

proc stats counts all the cpus in /proc/stat, but compares that number to the
value in get_cpu_count(), which returns the number of cpus actively being
balanced.  Since that value doesn't include banned cpus, its incorrect.  Since
we don't want to measure the load on banned cpus anyway, just skip those lines
so cpucount doesn't increment and the count remains equal.

Signed-off-by: Petr Holasek <pholasek@redhat.com>
Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
This commit is contained in:
Petr Holasek 2012-02-20 16:59:05 +01:00 committed by Neil Horman
parent 82047c1a22
commit e9e9dda303

View file

@ -32,6 +32,8 @@
#define LINESIZE 4096
extern cpumask_t banned_cpus;
static int proc_int_has_msi = 0;
static int msi_found_in_sysfs = 0;
@ -217,6 +219,9 @@ void parse_proc_stat(void)
cpunr = strtoul(&line[3], NULL, 10);
if (cpu_isset(cpunr, banned_cpus))
continue;
rc = sscanf(line, "%*s %*d %*d %*d %*d %*d %d %d", &irq_load, &softirq_load);
if (rc < 2)
break;