On Wed, 2010-09-22 at 16:04 +1000, Michael Neuling wrote: > When irqblance attempts writes to the IPI smp_affinity (ie. > /proc/irq/16/smp_affinity in the above example) it fails but irqbalance > ignores currently ignores this. > > This patch catches these write fails and in this case adds that IRQ > number to the banned IRQ list. This will catch the above IPI case and > any other IRQ where the SMP affinity can't be set.
Cool!
> Index: irqbalance/irqlist.c
> ===================================================================
> --- irqbalance.orig/irqlist.c
> +++ irqbalance/irqlist.c
> @@ -67,7 +67,7 @@
> DIR *dir;
> struct dirent *entry;
> char *c, *c2;
> - int nr , count = 0;
> + int nr , count = 0, can_set = 1;
> char buf[PATH_MAX];
> sprintf(buf, "/proc/irq/%i", number);
> dir = opendir(buf);
> @@ -80,7 +80,7 @@
> size_t size = 0;
> FILE *file;
> sprintf(buf, "/proc/irq/%i/smp_affinity", number);
> - file = fopen(buf, "r");
> + file = fopen(buf, "r+");
> if (!file)
> continue;
> if (getline(&line, &size, file)==0) {
> @@ -89,7 +89,14 @@
> continue;
> }
> cpumask_parse_user(line, strlen(line), irq->mask);
> - fclose(file);
> + /*
> + * Check that we can write the affinity, if
> + * not take it out of the list.
> + */
> + if (fwrite(line, strlen(line) - 1, 1, file) == 0)
if (fputs(line, file) == EOF)
?
cheers
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