Messages in this thread | | | Date | Fri, 5 Oct 2007 12:31:17 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: [RFC/PATCH -v2] Add sysfs control to modify a user's cpu share |
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On Thu, Oct 04, 2007 at 05:32:17PM -0400, Valdis.Kletnieks@vt.edu wrote: > > 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
Note that there is a default limit enforced on every new user (1024 value for the user's cpu share). This limit should contain any fork-bomb that the user may launch immediately.
> 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...
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