Date: Thu, 23 Oct 2008 11:21:49 -0700 From: "Murty, Ravi" <ravi.murty@intel.com> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: sched_thread_priority in ULE 8.0 Message-ID: <6D5D25EA3941074EB7734E51B166870401DDFA1D@orsmsx506.amr.corp.intel.com>
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Hello All,
This is something I've been trying to figure out in the last couple of hour=
s, but can't seem to understand.
Sched_thread_priority() updates a threads priority to "prio". If the thread=
is on the RUNQ, we have to pull it out and put it back at a different spot=
on the same queue. However, if the thread is currently running, I am missi=
ng something. If it is running shouldn't tdq->tdq_lowpri basically be same =
as the threads current priority (aka oldpri).. I can't seem to figure out w=
hy we need the else if check and a call to tdq_lowpri. If the thread is run=
ning and we've boosted the thread's priority, then simply changing tdq_lowp=
ri should do it right?
I've included part of the sched_thread_priority code below.
Thanks
Ravi
The code is as follows:
...
If (prio < tdq->tdq_lowpri)
tdq->tdq_lowpri
else if (tdq->tdq_lowpri =3D=3D oldpri)
tdq_setlowpri(tdq, td);
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