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new (more fifo) schedulint algorithm

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newproc will reuse dead procs

SVN=127565
This commit is contained in:
Ken Thompson 2008-07-16 13:50:23 -07:00
parent 44b8934d35
commit e7d549fbd7
2 changed files with 38 additions and 16 deletions
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49
src/runtime/proc.c
View File

@ -35,8 +35,24 @@ sys·newproc(int32 siz, byte* fn, byte* arg0)
sys·panicl(123);
}
newg = mal(sizeof(G));
stk = mal(4096);
// try to rip off an old goroutine
for(newg=allg; newg!=nil; newg=newg->alllink)
if(newg->status == Gdead)
break;
if(newg == nil) {
newg = mal(sizeof(G));
stk = mal(4096);
newg->stack0 = stk;
newg->status = Gwaiting;
newg->alllink = allg;
allg = newg;
} else {
stk = newg->stack0;
newg->status = Gwaiting;
}
newg->stackguard = stk+160;
sp = stk + 4096 - 4*8;
@ -56,8 +72,6 @@ sys·newproc(int32 siz, byte* fn, byte* arg0)
newg->goid = goidgen;
newg->status = Grunnable;
newg->alllink = allg;
allg = newg;
//prints(" goid=");
//sys·printint(newg->goid);
@ -67,18 +81,25 @@ sys·newproc(int32 siz, byte* fn, byte* arg0)
G*
select(void)
{
G *gp, *bestg;
G *gp;
bestg = nil;
for(gp=allg; gp!=nil; gp=gp->alllink) {
if(gp->status != Grunnable)
continue;
if(bestg == nil || gp->pri < bestg->pri)
bestg = gp;
gp = m->lastg;
if(gp == nil)
gp = allg;
for(gp=gp->alllink; gp!=nil; gp=gp->alllink) {
if(gp->status == Grunnable) {
m->lastg = gp;
return gp;
}
}
if(bestg != nil)
bestg->pri++;
return bestg;
for(gp=allg; gp!=nil; gp=gp->alllink) {
if(gp->status == Grunnable) {
m->lastg = gp;
return gp;
}
}
return nil;
}
void

5
src/runtime/runtime.h
View File

@ -105,11 +105,11 @@ struct G
{
byte* stackguard; // must not move
byte* stackbase; // must not move
byte* stack0; // first stack segment
Gobuf sched;
G* alllink; // on allq
G* qlink; // on wait q
int32 status;
int32 pri;
int32 goid;
byte elem[8]; // transfer element for chan
};
@ -117,8 +117,9 @@ struct M
{
G* g0; // g0 w interrupt stack - must not move
uint64 morearg; // arg to morestack - must not move
uint64 cret; // return value from C - must not move
uint64 cret; // return value from C - must not move
G* curg; // current running goroutine
G* lastg; // last running goroutine - to emulate fifo
Gobuf sched;
Gobuf morestack;
byte* moresp;