On Sun, Jun 3, 2012 at 5:28 PM, Lauri Kasanen <curaga@xxxxxxxxxxxxx> wrote: > Udev was the limiting factor for us on low-RAM systems. > Given an average RSS of 180kb, 128 workers would require ~23mb of RAM. All workers are direct clone()s of the master process without exec(), you are sure that every of them uses additional 128k? > Now, please consider what happens when there is only, say, 15mb free. > Udev protects itself from OOM, and the kernel can do nothing but panic. It does, if does not get started by systemd. > 28 workers * 0.18mb = ~5mb. This change should not affect more powerful > systems much, given that they still get the addition from the amount of RAM. That logic is from the time we needed to fork() for every event. Even on a system with lots of devices we usually do not need more than 30-50 workers. Today, workers are re-used; we could lower that limit even more if needed, without bad side effects. Applied. Thanks, Kay -- To unsubscribe from this list: send the line "unsubscribe linux-hotplug" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
