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runtime: include bootstrap m in mcpu accounting

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R=rsc, dvyukov
CC=golang-dev
https://golang.org/cl/5307052
This commit is contained in:
Hector Chu 2011-10-25 08:35:20 +01:00
parent d72267ae23
commit 2572ca2ff2
1 changed files with 11 additions and 0 deletions
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11
src/pkg/runtime/proc.c
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@ -128,6 +128,8 @@ Sched runtime·sched;
int32 runtime·gomaxprocs;
bool runtime·singleproc;
static bool canaddmcpu(void);
// An m that is waiting for notewakeup(&m->havenextg). This may
// only be accessed while the scheduler lock is held. This is used to
// minimize the number of times we call notewakeup while the scheduler
@ -202,6 +204,10 @@ runtime·schedinit(void)
setmcpumax(runtime·gomaxprocs);
runtime·singleproc = runtime·gomaxprocs == 1;
canaddmcpu(); // mcpu++ to account for bootstrap m
m->helpgc = 1; // flag to tell schedule() to mcpu--
runtime·sched.grunning++;
mstats.enablegc = 1;
m->nomemprof--;
}
@ -811,6 +817,7 @@ schedule(G *gp)
readylocked(gp);
}
} else if(m->helpgc) {
// Bootstrap m or new m started by starttheworld.
// atomic { mcpu-- }
v = runtime·xadd(&runtime·sched.atomic, -1<<mcpuShift);
if(atomic_mcpu(v) > maxgomaxprocs)
@ -818,6 +825,10 @@ schedule(G *gp)
// Compensate for increment in starttheworld().
runtime·sched.grunning--;
m->helpgc = 0;
} else if(m->nextg != nil) {
// New m started by matchmg.
} else {
runtime·throw("invalid m state in scheduler");
}
// Find (or wait for) g to run. Unlocks runtime·sched.