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| author | mav <mav@FreeBSD.org> | 2012-08-11 20:24:39 +0000 |
|---|---|---|
| committer | mav <mav@FreeBSD.org> | 2012-08-11 20:24:39 +0000 |
| commit | 60e552193c6254b62636fc4532d50854f1ec0739 (patch) | |
| tree | 570482f009d2f33ef6dac759439eb9a4755b1f6b /sys/kern/sched_4bsd.c | |
| parent | c88a41061f74c31f13da5dd0358685499d8dbb06 (diff) | |
| download | FreeBSD-src-60e552193c6254b62636fc4532d50854f1ec0739.zip FreeBSD-src-60e552193c6254b62636fc4532d50854f1ec0739.tar.gz | |
Some more minor tunings inspired by bde@.
Diffstat (limited to 'sys/kern/sched_4bsd.c')
| -rw-r--r-- | sys/kern/sched_4bsd.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c index 4d10011..f7fd347 100644 --- a/sys/kern/sched_4bsd.c +++ b/sys/kern/sched_4bsd.c @@ -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)); } /* |
