Date: Wed, 18 Aug 2021 09:43:14 +0000 From: Amit kumar <akamit91@hotmail.com> To: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: How to compute the amount of time a thread has been running on cpu Message-ID: <DM4PR11MB55194EC3EA40B394DA8EF4E3DCFF9@DM4PR11MB5519.namprd11.prod.outlook.com>
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I am trying to figure out how long a thread(sitting on a particular CPU's r=
eal-time RUNQ) has been running on the CPU, (might help if I can collect th=
e runtime stats of the tread across the CPUs in the case it did run on othe=
r CPUs too).
I came across td_runtime and ts_runtime.
ts_slptime =3D 18008,
ts_runtime =3D 414196,
td_slptick =3D 0,
td_blktick =3D 0,
td_incruntime =3D 36984047370,
td_runtime =3D 55246215882,
td_lastcpu =3D 0,
td_oncpu =3D -1,
looking at the code it seems ts_runtime is a decayed sum, but I dint find t=
he same for td_runtime.
Can someone help me find out how long this thread has been running and whic=
h paramere is more reliable?
Another question
I see db_show_thread, converts ticks to ms, using the calculation listed be=
low, is this correct or just an approximation?
delta =3D (u_int)ticks - (u_int)td->td_swinvoltick;
db_printf(" last involuntary switch: %d ms ago\n",
1000 * delta / hz);
-AK
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