time(3): Declare the minimum and maximum hz values supported.
Reviewed by: kib@ and imp@ MFC after: 1 week Sponsored by: NVIDIA Networking Differential Revision: https://reviews.freebsd.org/D37072
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@ -111,6 +111,10 @@ u_long sgrowsiz; /* amount to grow stack */
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SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &hz, 0,
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"Number of clock ticks per second");
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SYSCTL_INT(_kern, OID_AUTO, hz_max, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, HZ_MAXIMUM,
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"Maximum hz value supported");
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SYSCTL_INT(_kern, OID_AUTO, hz_min, CTLFLAG_RD, SYSCTL_NULL_INT_PTR, HZ_MINIMUM,
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"Minimum hz value supported");
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SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &nbuf, 0,
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"Number of buffers in the buffer cache");
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SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &nswbuf, 0,
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@ -173,6 +177,13 @@ init_param1(void)
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TUNABLE_INT_FETCH("kern.hz", &hz);
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if (hz == -1)
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hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
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/* range check the "hz" value */
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if (__predict_false(hz < HZ_MINIMUM))
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hz = HZ_MINIMUM;
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else if (__predict_false(hz > HZ_MAXIMUM))
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hz = HZ_MAXIMUM;
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tick = 1000000 / hz;
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tick_sbt = SBT_1S / hz;
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tick_bt = sbttobt(tick_sbt);
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@ -583,6 +583,13 @@ void timevaladd(struct timeval *t1, const struct timeval *t2);
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void timevalsub(struct timeval *t1, const struct timeval *t2);
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int tvtohz(struct timeval *tv);
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/*
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* The following HZ limits allow the tvtohz() function
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* to only use integer computations.
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*/
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#define HZ_MAXIMUM (INT_MAX / (1000000 >> 6)) /* 137kHz */
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#define HZ_MINIMUM 8 /* hz */
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#define TC_DEFAULTPERC 5
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#define BT2FREQ(bt) \
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