On Monday 27 March 2006 13:40, you wrote: > Hi, > > On Mon, 2006-03-27 at 07:32 -0600, Pat Double wrote: > > On Monday 27 March 2006 06:51, Pat Double wrote: > > > Kernel 2.6.16 has a new scheduling priority SCHED_IDLEPRIO. Currently > > > beagled attempts to run some things using "ionice" but this requires > > > root priviledges. SCHED_IDLEPRIO can be set by the user. > > > > > > Would it be acceptable to change beagled to use this instead of ionice > > > when a 2.6.16 kernel is detected? How about beagled setting itself to > > > this priority when started? > > > > OK, bad form replying to myself, but I was mistaken. It is the ck > > patchset that has SCHED_IDLEPRIO. Still, I think it would be worthwhile > > to investigate this. The patchset is popular. > > Is there any hope for this to go into the mainline kernel? I'm > reluctant to add support for it until it's in, because the API can > change. Anyone who ran Beagle before inotify went in can testify to > that. I understand, I probably would not have posted if I had originally remembered it was not in mainline. There are patches from this patchset that have made it into mainline in the past, I am unaware of the effort (or lack thereof) there may be to move these inline. > The reason why ionice is root-only is because unprivileged processes can > effectively block access to any other process by opening files and being > unable to do any IO because other processes are using it. Do you know > if that DoS is possible with this patch? I read about that. I do not know if the DoS is possible. Off the cuff I doubt it because this is a CPU priority, not an I/O priority. It only schedules CPU time to a process if the CPU is idle. So I do not see how it could block other processes, but then I'm not a kernel dev either. I'll look into it or ask on the mailing list. > Thanks, > Joe -- Pat Double, pat patdouble com "In the beginning God created the heaven and the earth."
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