Udev workers consume typically 50-100MiB virtual memory.
On systems with lots of CPUs and relatively low memory, that may
easily cause workers to be OOM-killed.
This patch limits the number of workers to 8 per GiB memory.
But don't let the limit drop below the smallest value we had
without this patch (8 + 1 * 2 = 10); on small systems, udev's
memory footprint is likely lower.
if (arg_children_max == 0) {
cpu_set_t cpu_set;
+ unsigned long mem_limit;
arg_children_max = 8;
if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0)
arg_children_max += CPU_COUNT(&cpu_set) * 2;
+ mem_limit = physical_memory() / (128LU*1024*1024);
+ arg_children_max = MAX(10U, MIN(arg_children_max, mem_limit));
+
log_debug("set children_max to %u", arg_children_max);
}