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keep track of the number of enabled probes and set the lockstat_dtrace_enabled

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flag appropriately.
This commit is contained in:
christos 2015-03-09 01:42:26 +00:00
parent aa44322b8b
commit 4d0ad52103
1 changed files with 13 additions and 2 deletions
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15
external/cddl/osnet/dev/lockstat/lockstat.c vendored
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@ -1,4 +1,4 @@
/* $NetBSD: lockstat.c,v 1.7 2015/03/09 01:07:27 riastradh Exp $ */
/* $NetBSD: lockstat.c,v 1.8 2015/03/09 01:42:26 christos Exp $ */
/*
* CDDL HEADER START
@ -26,7 +26,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lockstat.c,v 1.7 2015/03/09 01:07:27 riastradh Exp $");
__KERNEL_RCSID(0, "$NetBSD: lockstat.c,v 1.8 2015/03/09 01:42:26 christos Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -38,6 +38,7 @@ __KERNEL_RCSID(0, "$NetBSD: lockstat.c,v 1.7 2015/03/09 01:07:27 riastradh Exp $
#include <sys/xcall.h>
#include <sys/atomic.h>
#define NLOCKSTAT 1
#include <dev/lockstat.h>
#define ASSERT KASSERT
@ -62,6 +63,7 @@ lockstat_probe_t lockstat_probes[] = {
};
static dtrace_provider_id_t lockstat_id;
static size_t lockstat_dtrace_count;
/*ARGSUSED*/
static int
@ -72,6 +74,10 @@ lockstat_enable(void *arg, dtrace_id_t id, void *parg)
ASSERT(!lockstat_probemap[LS_COMPRESS(probe->lsp_probe)]);
lockstat_probemap[LS_COMPRESS(probe->lsp_probe)] = id;
if (lockstat_dtrace_count++ == 0) {
lockstat_dtrace_enabled = LB_DTRACE;
LOCKSTAT_ENABLED_UPDATE();
}
return 0;
}
@ -84,6 +90,11 @@ lockstat_disable(void *arg, dtrace_id_t id __unused, void *parg)
ASSERT(lockstat_probemap[LS_COMPRESS(probe->lsp_probe)]);
if (--lockstat_dtrace_count == 0) {
lockstat_dtrace_enabled = 0;
LOCKSTAT_ENABLED_UPDATE();
}
lockstat_probemap[LS_COMPRESS(probe->lsp_probe)] = 0;
}