Hi,
I am doing academic research on Process Variations in
Multi-Core systems. As part of my project I want to
schedule all my threads to a single core to get a feel
of developing opensolaris. I am using a Dual Core
Sytem and have installed opensolaris on a Virtual
Machine. I tried dispatching all threads to a single
core but am not getting the desired results.
The changes I have made to the source code is as
follows:
1)In the usr/src/uts/common/disp/disp.c , I have
replaced the function disp_lowpri_cpu with my own
function shown below
/*
* disp_lowpower_cpu - schedule all threads to CPU0
*/
cpu_t *disp_lowpower_cpu(cpu_t *hint)
{
cpu_t *bestcpu;
cpu_t *cp;
ASSERT(hint != NULL);
/*
* Select CPU0
*/
bestcpu = hint;
cp = hint;
do {
if (cp->cpu_seqid == 0){
ASSERT((cp->cpu_flags & CPU_QUIESCED) == 0);
return(cp);
}
cp = cp->cpu_next;
} while (cp != hint);
/*
* Return the best CPU .
*/
ASSERT((bestcpu->cpu_flags & CPU_QUIESCED) == 0);
return (bestcpu);
}
2) In lines 1307, 1460, 1613 and in the function
cpu_choose (of disp.c) I have replaced the call from
disp_lowpri_cpu to my function namely
disp_lowpower_cpu.
3) In the file usr/src/uts/common/sys/disp.h I have
added my function as
extern struct cpu *disp_lowpower_cpu(struct cpu *);
Now after these changes I ran the command
nightly -i ./opensolaris.sh
and finally did a BFU.
I am expecting to see all the threads dispatched to
cpu0 but i can see a few of them are still running in
cpu1. I think I have missed out something very simple
but am not able to figure it out. Can anyone help me
in disptaching all the threads to a single core so
that I get some confidence in building my own
opensolaris.
Thank You,
Abu Saad Papa
Forgot the famous last words? Access your message archive online at
http://in.messenger.yahoo.com/webmessengerpromo.php
