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dtrace bits from riastradh

This commit is contained in:
christos 2015-03-08 22:45:16 +00:00
parent dfddf4df80
commit f341fbf934
2 changed files with 39 additions and 3 deletions
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26
sys/dev/lockstat.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: lockstat.c,v 1.19 2014/07/25 08:10:35 dholland Exp $ */
/* $NetBSD: lockstat.c,v 1.20 2015/03/08 22:45:16 christos Exp $ */
/*-
* Copyright (c) 2006, 2007 The NetBSD Foundation, Inc.
@ -40,7 +40,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lockstat.c,v 1.19 2014/07/25 08:10:35 dholland Exp $");
__KERNEL_RCSID(0, "$NetBSD: lockstat.c,v 1.20 2015/03/08 22:45:16 christos Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -110,6 +110,20 @@ size_t lockstat_sizeb;
int lockstat_busy;
struct timespec lockstat_stime;
#ifdef KDTRACE_HOOKS
CTASSERT(LB_NEVENT <= 3);
CTASSERT(LB_NLOCK <= (7 << LB_LOCK_SHIFT));
void
lockstat_probe_stub(uint32_t id, uintptr_t lock, uintptr_t callsite,
uintptr_t flags, uintptr_t count, uintptr_t cycles)
{
}
uint32_t lockstat_probemap[LS_NPROBES];
void (*lockstat_probe_func)(uint32_t, uintptr_t, uintptr_t,
uintptr_t, uintptr_t, uintptr_t) = &lockstat_probe_stub;
#endif
const struct cdevsw lockstat_cdevsw = {
.d_open = lockstat_open,
.d_close = lockstat_close,
@ -344,6 +358,14 @@ lockstat_event(uintptr_t lock, uintptr_t callsite, u_int flags, u_int count,
u_int event;
int s;
#ifdef KDTRACE_HOOKS
uint32_t id;
CTASSERT((LS_NPROBES & (LS_NPROBES - 1)) == 0);
if ((id = lockstat_probemap[LS_COMPRESS(flags)]) != 0)
(*lockstat_probe_func)(id, lock, callsite, flags, count,
cycles);
#endif
if ((flags & lockstat_enabled) != flags || count == 0)
return;
if (lock < lockstat_lockstart || lock > lockstat_lockend)

16
sys/dev/lockstat.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: lockstat.h,v 1.10 2009/01/20 14:49:00 yamt Exp $ */
/* $NetBSD: lockstat.h,v 1.11 2015/03/08 22:45:16 christos Exp $ */
/*-
* Copyright (c) 2006 The NetBSD Foundation, Inc.
@ -33,6 +33,7 @@
#define _SYS_LOCKSTAT_H_
#ifdef _KERNEL_OPT
#include "opt_dtrace.h"
#include <lockstat.h>
#endif
@ -195,4 +196,17 @@ extern volatile u_int lockstat_enabled;
#endif
#ifdef KDTRACE_HOOKS
#define LS_COMPRESS(f) \
((((f) & 3) | (((f) & 7) >> 6)) & (LS_NPROBES - 1))
#define LS_NPROBES 0x20 /* 5 bits */
extern uint32_t lockstat_probemap[];
extern void (*lockstat_probe_func)(uint32_t, uintptr_t, uintptr_t,
uintptr_t, uintptr_t, uintptr_t);
void lockstat_probe_stub(uint32_t, uintptr_t, uintptr_t,
uintptr_t, uintptr_t, uintptr_t);
#endif
#endif /* _SYS_LOCKSTAT_H_ */