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libc: compress directly recursive functions while profiling

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When a function calls itself, the execution slot of its child is now
just added to its own time.  This makes conceptual sense and also
reduces a big cause of depth inflation.
This commit is contained in:
Jacob Moody 2024-05-05 01:57:22 +00:00
parent 15d1425b27
commit bd1305a0b9
1 changed files with 10 additions and 1 deletions
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11
sys/src/libc/port/profile.c
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@ -19,6 +19,7 @@ struct Plink
long pc;
long count;
vlong time;
uint rec;
};
#pragma profile off
@ -44,6 +45,11 @@ _profin(void)
pp = _tos->prof.pp;
if(pp == 0 || (_tos->prof.pid && _tos->pid != _tos->prof.pid))
return _restore(arg, ret);
if(pc == pp->pc){
pp->rec++;
p = pp;
goto out;
}
for(p=pp->down; p; p=p->link)
if(p->pc == pc)
goto out;
@ -113,7 +119,10 @@ _profout(void)
p->time = p->time + _tos->clock;
break;
}
_tos->prof.pp = p->old;
if(p->rec)
p->rec--;
else
_tos->prof.pp = p->old;
return _restore(arg, ret);
}