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Fix two bugs in DTrace:

Browse Source 
* when the process exits, remove the associated USDT probes
* when the process forks, duplicate the USDT probes.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Rui Paulo 2010-09-09 09:58:05 +00:00
parent 4946fa6791
commit d3555b6fc2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=212357
4 changed files with 44 additions and 15 deletions
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16
sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
View File

@ -9218,7 +9218,6 @@ dtrace_difo_init(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
dtrace_difo_hold(dp);
}
#if defined(sun)
static dtrace_difo_t *
dtrace_difo_duplicate(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
{
@ -9262,7 +9261,6 @@ dtrace_difo_duplicate(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
dtrace_difo_init(new, vstate);
return (new);
}
#endif
static void
dtrace_difo_destroy(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
@ -14615,12 +14613,16 @@ dtrace_helpers_create(proc_t *p)
}
#if defined(sun)
static void
dtrace_helpers_destroy(void)
static
#endif
void
dtrace_helpers_destroy(proc_t *p)
{
dtrace_helpers_t *help;
dtrace_vstate_t *vstate;
#if defined(sun)
proc_t *p = curproc;
#endif
int i;
mutex_enter(&dtrace_lock);
@ -14707,7 +14709,10 @@ dtrace_helpers_destroy(void)
mutex_exit(&dtrace_lock);
}
static void
#if defined(sun)
static
#endif
void
dtrace_helpers_duplicate(proc_t *from, proc_t *to)
{
dtrace_helpers_t *help, *newhelp;
@ -14788,7 +14793,6 @@ dtrace_helpers_duplicate(proc_t *from, proc_t *to)
if (hasprovs)
dtrace_helper_provider_register(to, newhelp, NULL);
}
#endif
#if defined(sun)
/*

14
sys/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
View File

@ -456,6 +456,16 @@ fasttrap_fork(proc_t *p, proc_t *cp)
#if defined(sun)
ASSERT(p->p_dtrace_count > 0);
#else
if (p->p_dtrace_helpers) {
/*
* dtrace_helpers_duplicate() allocates memory.
*/
PROC_UNLOCK(p);
PROC_UNLOCK(cp);
dtrace_helpers_duplicate(p, cp);
PROC_LOCK(cp);
PROC_LOCK(p);
}
/*
* This check is purposely here instead of in kern_fork.c because,
* for legal resons, we cannot include the dtrace_cddl.h header
@ -539,6 +549,10 @@ fasttrap_exec_exit(proc_t *p)
* static probes are handled by the meta-provider remove entry point.
*/
fasttrap_provider_retire(p->p_pid, FASTTRAP_PID_NAME, 0);
#if !defined(sun)
if (p->p_dtrace_helpers)
dtrace_helpers_destroy(p);
#endif
PROC_LOCK(p);
}

5
sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
View File

@ -2289,6 +2289,11 @@ extern int dtrace_blksuword32(uintptr_t, uint32_t *, int);
extern void dtrace_getfsr(uint64_t *);
#endif
#if !defined(sun)
extern void dtrace_helpers_duplicate(proc_t *, proc_t *);
extern void dtrace_helpers_destroy(proc_t *);
#endif
#define DTRACE_CPUFLAG_ISSET(flag) \
(cpu_core[curcpu].cpuc_dtrace_flags & (flag))

24
sys/kern/kern_fork.c
View File

@ -671,15 +671,6 @@ fork1(td, flags, pages, procp)
p2->p_pfsflags = p1->p_pfsflags;
}
#ifdef KDTRACE_HOOKS
/*
* Tell the DTrace fasttrap provider about the new process
* if it has registered an interest.
*/
if (dtrace_fasttrap_fork)
dtrace_fasttrap_fork(p1, p2);
#endif
/*
* This begins the section where we must prevent the parent
* from being swapped.
@ -744,6 +735,21 @@ fork1(td, flags, pages, procp)
PROC_SLOCK(p2);
p2->p_state = PRS_NORMAL;
PROC_SUNLOCK(p2);
#ifdef KDTRACE_HOOKS
/*
* Tell the DTrace fasttrap provider about the new process
* if it has registered an interest. We have to do this only after
* p_state is PRS_NORMAL since the fasttrap module will use pfind()
* later on.
*/
if (dtrace_fasttrap_fork) {
PROC_LOCK(p1);
PROC_LOCK(p2);
dtrace_fasttrap_fork(p1, p2);
PROC_UNLOCK(p2);
PROC_UNLOCK(p1);
}
#endif
/*
* If RFSTOPPED not requested, make child runnable and add to