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softint(9): Sprinkle dtrace probes.

This commit is contained in:
riastradh 2022-10-28 21:52:02 +00:00
parent 0f295690c1
commit dfbd550ec3
1 changed files with 47 additions and 2 deletions
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49
sys/kern/kern_softint.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_softint.c,v 1.71 2022/09/03 02:48:00 thorpej Exp $ */
/* $NetBSD: kern_softint.c,v 1.72 2022/10/28 21:52:02 riastradh Exp $ */
/*-
* Copyright (c) 2007, 2008, 2019, 2020 The NetBSD Foundation, Inc.
@ -170,7 +170,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.71 2022/09/03 02:48:00 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.72 2022/10/28 21:52:02 riastradh Exp $");
#include <sys/param.h>
#include <sys/proc.h>
@ -184,6 +184,7 @@ __KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.71 2022/09/03 02:48:00 thorpej Ex
#include <sys/cpu.h>
#include <sys/xcall.h>
#include <sys/psref.h>
#include <sys/sdt.h>
#include <uvm/uvm_extern.h>
@ -223,6 +224,31 @@ u_int softint_timing;
static u_int softint_max;
static kmutex_t softint_lock;
SDT_PROBE_DEFINE4(sdt, kernel, softint, establish,
"void *"/*sih*/,
"void (*)(void *)"/*func*/,
"void *"/*arg*/,
"unsigned"/*flags*/);
SDT_PROBE_DEFINE1(sdt, kernel, softint, disestablish,
"void *"/*sih*/);
SDT_PROBE_DEFINE2(sdt, kernel, softint, schedule,
"void *"/*sih*/,
"struct cpu_info *"/*ci*/);
SDT_PROBE_DEFINE4(sdt, kernel, softint, entry,
"void *"/*sih*/,
"void (*)(void *)"/*func*/,
"void *"/*arg*/,
"unsigned"/*flags*/);
SDT_PROBE_DEFINE4(sdt, kernel, softint, return,
"void *"/*sih*/,
"void (*)(void *)"/*func*/,
"void *"/*arg*/,
"unsigned"/*flags*/);
/*
* softint_init_isr:
*
@ -382,6 +408,8 @@ softint_establish(u_int flags, void (*func)(void *), void *arg)
}
mutex_exit(&softint_lock);
SDT_PROBE4(sdt, kernel, softint, establish, sih, func, arg, flags);
return sih;
}
@ -425,6 +453,12 @@ softint_disestablish(void *arg)
*/
xc_barrier(XC_HIGHPRI_IPL(sh->sh_isr->si_ipl));
/*
* Notify dtrace probe when the old softint can't be running
* any more, but before it can be recycled for a new softint.
*/
SDT_PROBE1(sdt, kernel, softint, disestablish, arg);
/* Clear the handler on each CPU. */
mutex_enter(&softint_lock);
for (CPU_INFO_FOREACH(cii, ci)) {
@ -451,6 +485,8 @@ softint_schedule(void *arg)
uintptr_t offset;
int s;
SDT_PROBE2(sdt, kernel, softint, schedule, arg, /*ci*/NULL);
/*
* If this assert fires, rather than disabling preemption explicitly
* to make it stop, consider that you are probably using a softint
@ -503,6 +539,7 @@ softint_schedule_cpu(void *arg, struct cpu_info *ci)
const uintptr_t offset = (uintptr_t)arg;
const softhand_t *sh;
SDT_PROBE2(sdt, kernel, softint, schedule, arg, ci);
sh = (const softhand_t *)((const uint8_t *)sc + offset);
KASSERT((sh->sh_flags & SOFTINT_RCPU) != 0);
ipi_trigger(sh->sh_ipi_id, ci);
@ -550,6 +587,10 @@ softint_execute(lwp_t *l, int s)
splx(s);
/* Run the handler. */
SDT_PROBE4(sdt, kernel, softint, entry,
((const char *)sh -
(const char *)curcpu()->ci_data.cpu_softcpu),
sh->sh_func, sh->sh_arg, sh->sh_flags);
if (__predict_true((sh->sh_flags & SOFTINT_MPSAFE) != 0)) {
(*sh->sh_func)(sh->sh_arg);
} else {
@ -557,6 +598,10 @@ softint_execute(lwp_t *l, int s)
(*sh->sh_func)(sh->sh_arg);
KERNEL_UNLOCK_ONE(l);
}
SDT_PROBE4(sdt, kernel, softint, return,
((const char *)sh -
(const char *)curcpu()->ci_data.cpu_softcpu),
sh->sh_func, sh->sh_arg, sh->sh_flags);
/* Diagnostic: check that spin-locks have not leaked. */
KASSERTMSG(curcpu()->ci_mtx_count == 0,