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Make irqbalance scan for new irqs when it detects new irqs

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Like cpu hotplug, irqbalance needs to rebuild its topo map and irq db when it
detects new irqs in the system.  This patch adds that ability

Resolves: http://code.google.com/p/irqbalance/issues/detail?id=32

Singed-off-by: Neil Horman <nhorman@tuxdriver.com>
This commit is contained in:
Neil Horman 2012-07-02 13:27:14 -04:00
parent b632577f90
commit 1523a7830c
3 changed files with 16 additions and 6 deletions
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6
irqbalance.c
View file

@ -46,7 +46,7 @@ int one_shot_mode;
int debug_mode;
int foreground_mode;
int numa_avail;
int need_cpu_rescan;
int need_rescan;
extern cpumask_t banned_cpus;
enum hp_e hint_policy = HINT_POLICY_SUBSET;
unsigned long power_thresh = ULONG_MAX;
@ -301,8 +301,8 @@ int main(int argc, char** argv)
parse_proc_stat();
/* cope with cpu hotplug -- detected during /proc/interrupts parsing */
if (need_cpu_rescan) {
need_cpu_rescan = 0;
if (need_rescan) {
need_rescan = 0;
/* if there's a hotplug event we better turn off power mode for a bit until things settle */
power_mode = 0;
if (debug_mode)

2
irqbalance.h
View file

@ -64,7 +64,7 @@ enum hp_e {
extern int debug_mode;
extern int one_shot_mode;
extern int power_mode;
extern int need_cpu_rescan;
extern int need_rescan;
extern enum hp_e hint_policy;
extern unsigned long long cycle_count;
extern unsigned long power_thresh;

14
procinterrupts.c
View file

@ -83,8 +83,18 @@ void parse_proc_interrupts(void)
c++;
number = strtoul(line, NULL, 10);
info = get_irq_info(number);
if (!info)
if (!info) {
/*
* If this is our 0th pass through this routine
* this is an irq that wasn't reported in sysfs
* and we should just add it. If we've been running
* a while then this irq just appeared and its time
* to rescan our irqs
*/
if (cycle_count)
need_rescan = 1;
info = add_misc_irq(number);
}
count = 0;
cpunr = 0;
@ -100,7 +110,7 @@ void parse_proc_interrupts(void)
cpunr++;
}
if (cpunr != core_count)
need_cpu_rescan = 1;
need_rescan = 1;
info->last_irq_count = info->irq_count;
info->irq_count = count;