RE: your mail

[Laughlin, Joseph V]

> -----Original Message-----
> From: Herbert Poetzl [mailto:herbert@xxxxxxxxxxxx] 
> Sent: Monday, May 24, 2004 3:30 PM
> To: Laughlin, Joseph V
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: your mail
> 
> 
> On Mon, May 24, 2004 at 03:20:33PM -0700, Laughlin, Joseph V wrote:
> > I've been tasked with modifying a 2.4 kernel so that a 
> non-root user 
> > can do the following:
> > 
> > Dynamically change the priorities of processes (up and down) Lock 
> > processes in memory Can change process cpu affinity
> > 
> > Anyone got any ideas about how I could start doing this?  
> (I'm new to 
> > kernel development, btw.)
> 
> check the kernel capability system ...
> (it's quite simple)
> 
> #define CAP_SYS_NICE         23
> #define CAP_IPC_LOCK         14
> 
> cpu scheduler affinity isn't part of 2.4 AFAIK
> so there is no easy way to 'control' it ...
> 

Currently, we're using sched_setaffinity() to control it, which existed
in our 2.4.19 kernel.  (but, you have to be root to use it, and we'd
like non-root users to be able to change the affinity.)

Joe

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