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Add td_swinvoltick to track last involuntary context switch

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Expose in DDB via "show thread."

Reviewed by:	markj
Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Conrad Meyer 2016-03-25 19:35:29 +00:00
parent 17e3ebb1ad
commit c975a5d359
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=297273
3 changed files with 16 additions and 1 deletions
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12
sys/ddb/db_ps.c
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@ -36,6 +36,7 @@ __FBSDID("$FreeBSD$");
#include <sys/cons.h>
#include <sys/jail.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/sysent.h>
#include <sys/systm.h>
@ -302,6 +303,7 @@ DB_SHOW_COMMAND(thread, db_show_thread)
struct thread *td;
struct lock_object *lock;
bool comma;
int delta;
/* Determine which thread to examine. */
if (have_addr)
@ -376,6 +378,16 @@ DB_SHOW_COMMAND(thread, db_show_thread)
td->td_wchan);
db_printf(" priority: %d\n", td->td_priority);
db_printf(" container lock: %s (%p)\n", lock->lo_name, lock);
if (td->td_swvoltick != 0) {
delta = (u_int)ticks - (u_int)td->td_swvoltick;
db_printf(" last voluntary switch: %d ms ago\n",
1000 * delta / hz);
}
if (td->td_swinvoltick != 0) {
delta = (u_int)ticks - (u_int)td->td_swinvoltick;
db_printf(" last involuntary switch: %d ms ago\n",
1000 * delta / hz);
}
}
DB_SHOW_COMMAND(proc, db_show_proc)

4
sys/kern/kern_synch.c
View File

@ -438,8 +438,10 @@ mi_switch(int flags, struct thread *newtd)
if (flags & SW_VOL) {
td->td_ru.ru_nvcsw++;
td->td_swvoltick = ticks;
} else
} else {
td->td_ru.ru_nivcsw++;
td->td_swinvoltick = ticks;
}
#ifdef SCHED_STATS
SCHED_STAT_INC(sched_switch_stats[flags & SW_TYPE_MASK]);
#endif

1
sys/sys/proc.h
View File

@ -254,6 +254,7 @@ struct thread {
int td_slptick; /* (t) Time at sleep. */
int td_blktick; /* (t) Time spent blocked. */
int td_swvoltick; /* (t) Time at last SW_VOL switch. */
int td_swinvoltick; /* (t) Time at last SW_INVOL switch. */
u_int td_cow; /* (*) Number of copy-on-write faults */
struct rusage td_ru; /* (t) rusage information. */
struct rusage_ext td_rux; /* (t) Internal rusage information. */