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Some more minor tunings inspired by bde@.

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This commit is contained in:
Alexander Motin 2012-08-11 20:24:39 +00:00
parent f049a6cb4a
commit 37f4e0254f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=239196
2 changed files with 31 additions and 25 deletions
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16
sys/kern/sched_4bsd.c
View File

@ -193,12 +193,13 @@ sysctl_kern_quantum(SYSCTL_HANDLER_ARGS)
period = 1000000 / realstathz;
new_val = period * sched_slice;
error = sysctl_handle_int(oidp, &new_val, 0, req);
if (error != 0 || req->newptr == NULL)
if (error != 0 || req->newptr == NULL)
return (error);
if (new_val <= 0)
return (EINVAL);
sched_slice = max(1, (new_val + period / 2) / period);
hogticks = max(1, 2 * hz * sched_slice / realstathz);
sched_slice = imax(1, (new_val + period / 2) / period);
hogticks = imax(1, (2 * hz * sched_slice + realstathz / 2) /
realstathz);
return (0);
}
@ -208,9 +209,9 @@ SYSCTL_STRING(_kern_sched, OID_AUTO, name, CTLFLAG_RD, "4BSD", 0,
"Scheduler name");
SYSCTL_PROC(_kern_sched, OID_AUTO, quantum, CTLTYPE_INT | CTLFLAG_RW,
NULL, 0, sysctl_kern_quantum, "I",
"Length of time granted to timeshare threads in microseconds");
"Quantum for timeshare threads in microseconds");
SYSCTL_INT(_kern_sched, OID_AUTO, slice, CTLFLAG_RW, &sched_slice, 0,
"Length of time granted to timeshare threads in stathz ticks");
"Quantum for timeshare threads in stathz ticks");
#ifdef SMP
/* Enable forwarding of wakeups to all other cpus */
static SYSCTL_NODE(_kern_sched, OID_AUTO, ipiwakeup, CTLFLAG_RD, NULL,
@ -665,7 +666,8 @@ sched_initticks(void *dummy)
realstathz = stathz ? stathz : hz;
sched_slice = realstathz / 10; /* ~100ms */
hogticks = max(1, 2 * hz * sched_slice / realstathz);
hogticks = imax(1, (2 * hz * sched_slice + realstathz / 2) /
realstathz);
}
/* External interfaces start here */
@ -704,7 +706,7 @@ sched_rr_interval(void)
{
/* Convert sched_slice from stathz to hz. */
return (max(1, (sched_slice * hz + realstathz / 2) / realstathz));
return (imax(1, (sched_slice * hz + realstathz / 2) / realstathz));
}
/*

40
sys/kern/sched_ule.c
View File

@ -1383,7 +1383,8 @@ sched_initticks(void *dummy)
realstathz = stathz ? stathz : hz;
sched_slice = realstathz / 10; /* ~100ms */
hogticks = max(1, 2 * hz * sched_slice / realstathz);
hogticks = imax(1, (2 * hz * sched_slice + realstathz / 2) /
realstathz);
/*
* tickincr is shifted out by 10 to avoid rounding errors due to
@ -1406,7 +1407,7 @@ sched_initticks(void *dummy)
affinity = SCHED_AFFINITY_DEFAULT;
#endif
if (sched_idlespinthresh < 0)
sched_idlespinthresh = max(16, 2 * hz / realstathz);
sched_idlespinthresh = imax(16, 2 * hz / realstathz);
}
@ -1595,7 +1596,7 @@ sched_rr_interval(void)
{
/* Convert sched_slice from stathz to hz. */
return (max(1, (sched_slice * hz + realstathz / 2) / realstathz));
return (imax(1, (sched_slice * hz + realstathz / 2) / realstathz));
}
/*
@ -2790,12 +2791,13 @@ sysctl_kern_quantum(SYSCTL_HANDLER_ARGS)
period = 1000000 / realstathz;
new_val = period * sched_slice;
error = sysctl_handle_int(oidp, &new_val, 0, req);
if (error != 0 || req->newptr == NULL)
if (error != 0 || req->newptr == NULL)
return (error);
if (new_val <= 0)
return (EINVAL);
sched_slice = max(1, (new_val + period / 2) / period);
hogticks = max(1, 2 * hz * sched_slice / realstathz);
sched_slice = imax(1, (new_val + period / 2) / period);
hogticks = imax(1, (2 * hz * sched_slice + realstathz / 2) /
realstathz);
return (0);
}
@ -2804,19 +2806,21 @@ SYSCTL_STRING(_kern_sched, OID_AUTO, name, CTLFLAG_RD, "ULE", 0,
"Scheduler name");
SYSCTL_PROC(_kern_sched, OID_AUTO, quantum, CTLTYPE_INT | CTLFLAG_RW,
NULL, 0, sysctl_kern_quantum, "I",
"Length of time granted to timeshare threads in microseconds");
"Quantum for timeshare threads in microseconds");
SYSCTL_INT(_kern_sched, OID_AUTO, slice, CTLFLAG_RW, &sched_slice, 0,
"Length of time granted to timeshare threads in stathz ticks");
"Quantum for timeshare threads in stathz ticks");
SYSCTL_INT(_kern_sched, OID_AUTO, interact, CTLFLAG_RW, &sched_interact, 0,
"Interactivity score threshold");
SYSCTL_INT(_kern_sched, OID_AUTO, preempt_thresh, CTLFLAG_RW, &preempt_thresh,
0,"Min priority for preemption, lower priorities have greater precedence");
SYSCTL_INT(_kern_sched, OID_AUTO, static_boost, CTLFLAG_RW, &static_boost,
0,"Controls whether static kernel priorities are assigned to sleeping threads.");
SYSCTL_INT(_kern_sched, OID_AUTO, idlespins, CTLFLAG_RW, &sched_idlespins,
0,"Number of times idle thread will spin waiting for new work.");
SYSCTL_INT(_kern_sched, OID_AUTO, idlespinthresh, CTLFLAG_RW, &sched_idlespinthresh,
0,"Threshold before we will permit idle thread spinning.");
"Interactivity score threshold");
SYSCTL_INT(_kern_sched, OID_AUTO, preempt_thresh, CTLFLAG_RW,
&preempt_thresh, 0,
"Maximal (lowest) priority for preemption");
SYSCTL_INT(_kern_sched, OID_AUTO, static_boost, CTLFLAG_RW, &static_boost, 0,
"Assign static kernel priorities to sleeping threads");
SYSCTL_INT(_kern_sched, OID_AUTO, idlespins, CTLFLAG_RW, &sched_idlespins, 0,
"Number of times idle thread will spin waiting for new work");
SYSCTL_INT(_kern_sched, OID_AUTO, idlespinthresh, CTLFLAG_RW,
&sched_idlespinthresh, 0,
"Threshold before we will permit idle thread spinning");
#ifdef SMP
SYSCTL_INT(_kern_sched, OID_AUTO, affinity, CTLFLAG_RW, &affinity, 0,
"Number of hz ticks to keep thread affinity for");
@ -2828,7 +2832,7 @@ SYSCTL_INT(_kern_sched, OID_AUTO, balance_interval, CTLFLAG_RW,
SYSCTL_INT(_kern_sched, OID_AUTO, steal_idle, CTLFLAG_RW, &steal_idle, 0,
"Attempts to steal work from other cores before idling");
SYSCTL_INT(_kern_sched, OID_AUTO, steal_thresh, CTLFLAG_RW, &steal_thresh, 0,
"Minimum load on remote cpu before we'll steal");
"Minimum load on remote CPU before we'll steal");
SYSCTL_PROC(_kern_sched, OID_AUTO, topology_spec, CTLTYPE_STRING |
CTLFLAG_RD, NULL, 0, sysctl_kern_sched_topology_spec, "A",
"XML dump of detected CPU topology");