How do I raise a thread to realtime priority?

How do I raise a thread to realtime priority?

[Robin Holt]

In the 2.4 kernel headers, unistd.h had a _syscall3 that I could
use to make an extern of the sys_sched_setscheduler raise a tasks
priority to realtime.  With 2.6, the _syscall3 has been replaced
with static inlines.  This all seems well.

Since sys_sched_setscheduler is not in the unistd.h, should I add
it to unistd.h?  Is there a prefered method for exporting/inlining
syscall entry points?

Thanks,
Robin Holt

Re: How do I raise a thread to realtime priority?

[Matthew Wilcox]

On Thu, Feb 12, 2004 at 03:53:57PM -0600, Robin Holt wrote:
> In the 2.4 kernel headers, unistd.h had a _syscall3 that I could
> use to make an extern of the sys_sched_setscheduler raise a tasks
> priority to realtime.  With 2.6, the _syscall3 has been replaced
> with static inlines.  This all seems well.
> 
> Since sys_sched_setscheduler is not in the unistd.h, should I add
> it to unistd.h?  Is there a prefered method for exporting/inlining
> syscall entry points?

libc "exports syscall entry points" -- call sched_setscheduler().
That works on 2.4 and 2.6.

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain

Re: How do I raise a thread to realtime priority?

[Robin Holt]

On Thu, Feb 12, 2004 at 10:08:20PM +0000, Matthew Wilcox wrote:
> On Thu, Feb 12, 2004 at 03:53:57PM -0600, Robin Holt wrote:
> > In the 2.4 kernel headers, unistd.h had a _syscall3 that I could
> > use to make an extern of the sys_sched_setscheduler raise a tasks
> > priority to realtime.  With 2.6, the _syscall3 has been replaced
> > with static inlines.  This all seems well.
> > 
> > Since sys_sched_setscheduler is not in the unistd.h, should I add
> > it to unistd.h?  Is there a prefered method for exporting/inlining
> > syscall entry points?
> 
> libc "exports syscall entry points" -- call sched_setscheduler().
> That works on 2.4 and 2.6.

Maybe I wasn't clear.  This is a kernel thread that is trying to
raise priority.

Re: How do I raise a thread to realtime priority?

[Randy.Dunlap]

On Thu, 12 Feb 2004 16:17:52 -0600 Robin Holt <holt@sgi.com> wrote:

| On Thu, Feb 12, 2004 at 10:08:20PM +0000, Matthew Wilcox wrote:
| > On Thu, Feb 12, 2004 at 03:53:57PM -0600, Robin Holt wrote:
| > > In the 2.4 kernel headers, unistd.h had a _syscall3 that I could
| > > use to make an extern of the sys_sched_setscheduler raise a tasks
| > > priority to realtime.  With 2.6, the _syscall3 has been replaced
| > > with static inlines.  This all seems well.
| > > 
| > > Since sys_sched_setscheduler is not in the unistd.h, should I add
| > > it to unistd.h?  Is there a prefered method for exporting/inlining
| > > syscall entry points?
| > 
| > libc "exports syscall entry points" -- call sched_setscheduler().
| > That works on 2.4 and 2.6.
| 
| Maybe I wasn't clear.  This is a kernel thread that is trying to
| raise priority.

I have patches in progress (in -mm) that add this and other syscalls
to include/linux/syscalls.h (for non-arch-specific) and to
include/asm-*/unistd.h for arch-specific syscalls.

--
~Randy