diff options
| author | cem <cem@FreeBSD.org> | 2016-03-25 19:35:29 +0000 |
|---|---|---|
| committer | cem <cem@FreeBSD.org> | 2016-03-25 19:35:29 +0000 |
| commit | 96eb07ae2bc336657abd2d9e1615783f37819579 (patch) | |
| tree | d012a39b63ab3035ac64eff2913be737ef7bc687 /sys/ddb | |
| parent | 3f7a33e66911db686137453aca212b8460954cc4 (diff) | |
| download | FreeBSD-src-96eb07ae2bc336657abd2d9e1615783f37819579.zip FreeBSD-src-96eb07ae2bc336657abd2d9e1615783f37819579.tar.gz | |
Add td_swinvoltick to track last involuntary context switch
Expose in DDB via "show thread."
Reviewed by: markj
Sponsored by: EMC / Isilon Storage Division
Diffstat (limited to 'sys/ddb')
| -rw-r--r-- | sys/ddb/db_ps.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/ddb/db_ps.c b/sys/ddb/db_ps.c index f38c89f..76ab2c5 100644 --- a/sys/ddb/db_ps.c +++ b/sys/ddb/db_ps.c @@ -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) |
