On Thu, 04 Oct 2007 10:54:51 +0200, Heiko Carstens said: > > echo 2048 > /sys/kernel/uids/500/cpu_share > > > > this should just work too, regardless of there not being any UID 500 > > tasks yet. Likewise, once configured, the /sys/kernel/uids/* directories > > (with the settings in them) should probably not go away either. > > Shouldn't that be done via uevents? E.g. UID x gets added to the sysfs tree, > generates a uevent and a script then figures out the cpu_share and sets it.
That would tend to be a tad racy - a site may want to set limits in the hypothetical /sys/kernel/uids/NNN before the program has a chance to fork-bomb or otherwise make it difficult to set a limitfrom within another userspace process. It's similar to why you want a process to be launched with all its ulimit's set, rather than set them after the fork/exec happens...
pgpLeIh1OXCKR.pgp
Description: PGP signature
