Add td_swinvoltick to track last involuntary context switch
Expose in DDB via "show thread." Reviewed by: markj Sponsored by: EMC / Isilon Storage Division
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17e3ebb1ad
commit
c975a5d359
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=297273
@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
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#include <sys/cons.h>
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#include <sys/jail.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/sysent.h>
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#include <sys/systm.h>
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@ -302,6 +303,7 @@ DB_SHOW_COMMAND(thread, db_show_thread)
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struct thread *td;
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struct lock_object *lock;
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bool comma;
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int delta;
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/* Determine which thread to examine. */
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if (have_addr)
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@ -376,6 +378,16 @@ DB_SHOW_COMMAND(thread, db_show_thread)
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td->td_wchan);
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db_printf(" priority: %d\n", td->td_priority);
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db_printf(" container lock: %s (%p)\n", lock->lo_name, lock);
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if (td->td_swvoltick != 0) {
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delta = (u_int)ticks - (u_int)td->td_swvoltick;
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db_printf(" last voluntary switch: %d ms ago\n",
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1000 * delta / hz);
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}
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if (td->td_swinvoltick != 0) {
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delta = (u_int)ticks - (u_int)td->td_swinvoltick;
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db_printf(" last involuntary switch: %d ms ago\n",
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1000 * delta / hz);
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}
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}
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DB_SHOW_COMMAND(proc, db_show_proc)
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@ -438,8 +438,10 @@ mi_switch(int flags, struct thread *newtd)
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if (flags & SW_VOL) {
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td->td_ru.ru_nvcsw++;
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td->td_swvoltick = ticks;
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} else
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} else {
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td->td_ru.ru_nivcsw++;
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td->td_swinvoltick = ticks;
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}
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#ifdef SCHED_STATS
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SCHED_STAT_INC(sched_switch_stats[flags & SW_TYPE_MASK]);
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#endif
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@ -254,6 +254,7 @@ struct thread {
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int td_slptick; /* (t) Time at sleep. */
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int td_blktick; /* (t) Time spent blocked. */
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int td_swvoltick; /* (t) Time at last SW_VOL switch. */
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int td_swinvoltick; /* (t) Time at last SW_INVOL switch. */
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u_int td_cow; /* (*) Number of copy-on-write faults */
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struct rusage td_ru; /* (t) rusage information. */
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struct rusage_ext td_rux; /* (t) Internal rusage information. */
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