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When ktracing context switches, make sure we record involuntary switches.

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Otherwise, when we get a evicted from the cpu, there is no record of it.
This is not a default ktrace flag.
This commit is contained in:
Peter Wemm 2003-07-31 01:36:24 +00:00
parent ad7a226f9d
commit aeaead20b8
1 changed files with 14 additions and 0 deletions
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14
sys/kern/subr_trap.c
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@ -40,6 +40,7 @@
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ktrace.h"
#include "opt_mac.h"
#ifdef __i386__
#include "opt_npx.h"
@ -59,6 +60,11 @@ __FBSDID("$FreeBSD$");
#include <sys/signalvar.h>
#include <sys/systm.h>
#include <sys/vmmeter.h>
#ifdef KTRACE
#include <sys/uio.h>
#include <sys/ktrace.h>
#endif
#include <machine/cpu.h>
#include <machine/pcb.h>
@ -236,11 +242,19 @@ ast(struct trapframe *framep)
mac_thread_userret(td);
#endif
if (flags & TDF_NEEDRESCHED) {
#ifdef KTRACE
if (KTRPOINT(td, KTR_CSW))
ktrcsw(1, 0);
#endif
mtx_lock_spin(&sched_lock);
sched_prio(td, kg->kg_user_pri);
p->p_stats->p_ru.ru_nivcsw++;
mi_switch();
mtx_unlock_spin(&sched_lock);
#ifdef KTRACE
if (KTRPOINT(td, KTR_CSW))
ktrcsw(0, 0);
#endif
}
if (flags & TDF_NEEDSIGCHK) {
PROC_LOCK(p);