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- Place back STR string declarations for lock/unlock strings used for KTR_LOCK

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tracing in order to avoid duplication.
- Insert some tracepoints back into the mutex acq/rel code, thus ensuring
  that we can trace all lock acq/rel's again.
- All CURPROC != NULL checks are MPASS()es (under MUTEX_DEBUG) because they
  signify a serious mutex corruption.
- Change up some KASSERT()s to MPASS()es, and vice-versa, depending on the
  type of problem we're debugging (INVARIANTS is used here to check that
  the API is being used properly whereas MUTEX_DEBUG is used to ensure that
  something general isn't happening that will have bad impact on mutex
  locks).

Reminded by: jhb, jake, asmodai
This commit is contained in:
Bosko Milekic 2001-02-11 02:54:16 +00:00
parent 8073a93c76
commit 5746a1d866
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=72344
4 changed files with 93 additions and 46 deletions
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33
sys/kern/kern_mutex.c
View File

@ -162,6 +162,14 @@ static struct mtx all_mtx = { MTX_UNOWNED, 0, 0, 0, "All mutexes queue head",
static int mtx_cur_cnt;
static int mtx_max_cnt;
/*
* Couple of strings for KTR_LOCK tracing in order to avoid duplicates.
*/
char STR_mtx_lock_slp[] = "GOT (sleep) %s [%p] r=%d at %s:%d";
char STR_mtx_unlock_slp[] = "REL (sleep) %s [%p] r=%d at %s:%d";
char STR_mtx_lock_spn[] = "GOT (spin) %s [%p] r=%d at %s:%d";
char STR_mtx_unlock_spn[] = "REL (spin) %s [%p] r=%d at %s:%d";
/*
* Prototypes for non-exported routines.
*
@ -302,12 +310,13 @@ _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
{
int rval;
KASSERT(CURPROC != NULL, ("curproc is NULL in _mtx_trylock"));
MPASS(CURPROC != NULL);
/*
* _mtx_trylock does not accept MTX_NOSWITCH option.
*/
MPASS((opts & MTX_NOSWITCH) == 0);
KASSERT((opts & MTX_NOSWITCH) == 0,
("mtx_trylock() called with invalid option flag(s) %d", opts));
rval = _obtain_lock(m, CURTHD);
@ -317,7 +326,8 @@ _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
* We do not handle recursion in _mtx_trylock; see the
* note at the top of the routine.
*/
MPASS(!mtx_recursed(m));
KASSERT(!mtx_recursed(m),
("mtx_trylock() called on a recursed mutex"));
witness_try_enter(m, (opts | m->mtx_flags), file, line);
}
#endif /* WITNESS */
@ -344,13 +354,13 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
m->mtx_recurse++;
atomic_set_ptr(&m->mtx_lock, MTX_RECURSED);
if ((opts & MTX_QUIET) == 0)
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recurse", m);
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recursing", m);
return;
}
if ((opts & MTX_QUIET) == 0)
CTR3(KTR_LOCK, "mtx_lock: %p contested (lock=%p) [%p]", m,
(void *)m->mtx_lock, (void *)RETIP(m));
CTR3(KTR_LOCK, "_mtx_lock_sleep: %p contested (lock=%p) [%p]",
m, (void *)m->mtx_lock, (void *)RETIP(m));
/*
* Save our priority. Even though p_nativepri is protected by
@ -383,8 +393,7 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
*/
if (v == MTX_CONTESTED) {
p1 = TAILQ_FIRST(&m->mtx_blocked);
KASSERT(p1 != NULL,
("contested mutex has no contesters"));
MPASS(p1 != NULL);
m->mtx_lock = (uintptr_t)p | MTX_CONTESTED;
if (p1->p_priority < p->p_priority)
@ -421,7 +430,7 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
if (it->it_interrupted) {
if ((opts & MTX_QUIET) == 0)
CTR2(KTR_LOCK,
"mtx_lock: 0x%x interrupted 0x%x",
"_mtx_lock_sleep: 0x%x interrupted 0x%x",
it, it->it_interrupted);
intr_thd_fixup(it);
}
@ -486,7 +495,7 @@ _mtx_lock_spin(struct mtx *m, int opts, u_int mtx_intr, const char *file,
int i = 0;
if ((opts & MTX_QUIET) == 0)
CTR1(KTR_LOCK, "mtx_lock_spin: %p spinning", m);
CTR1(KTR_LOCK, "_mtx_lock_spin: %p spinning", m);
for (;;) {
if (_obtain_lock(m, CURPROC))
@ -530,10 +539,6 @@ _mtx_unlock_sleep(struct mtx *m, int opts, const char *file, int line)
p = CURPROC;
MPASS4(mtx_owned(m), "mtx_owned(mpp)", file, line);
if ((opts & MTX_QUIET) == 0)
CTR5(KTR_LOCK, "REL %s [%p] r=%d at %s:%d", m->mtx_description,
m, m->mtx_recurse, file, line);
if (mtx_recursed(m)) {
if (--(m->mtx_recurse) == 0)
atomic_clear_ptr(&m->mtx_lock, MTX_RECURSED);

33
sys/kern/subr_turnstile.c
View File

@ -162,6 +162,14 @@ static struct mtx all_mtx = { MTX_UNOWNED, 0, 0, 0, "All mutexes queue head",
static int mtx_cur_cnt;
static int mtx_max_cnt;
/*
* Couple of strings for KTR_LOCK tracing in order to avoid duplicates.
*/
char STR_mtx_lock_slp[] = "GOT (sleep) %s [%p] r=%d at %s:%d";
char STR_mtx_unlock_slp[] = "REL (sleep) %s [%p] r=%d at %s:%d";
char STR_mtx_lock_spn[] = "GOT (spin) %s [%p] r=%d at %s:%d";
char STR_mtx_unlock_spn[] = "REL (spin) %s [%p] r=%d at %s:%d";
/*
* Prototypes for non-exported routines.
*
@ -302,12 +310,13 @@ _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
{
int rval;
KASSERT(CURPROC != NULL, ("curproc is NULL in _mtx_trylock"));
MPASS(CURPROC != NULL);
/*
* _mtx_trylock does not accept MTX_NOSWITCH option.
*/
MPASS((opts & MTX_NOSWITCH) == 0);
KASSERT((opts & MTX_NOSWITCH) == 0,
("mtx_trylock() called with invalid option flag(s) %d", opts));
rval = _obtain_lock(m, CURTHD);
@ -317,7 +326,8 @@ _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
* We do not handle recursion in _mtx_trylock; see the
* note at the top of the routine.
*/
MPASS(!mtx_recursed(m));
KASSERT(!mtx_recursed(m),
("mtx_trylock() called on a recursed mutex"));
witness_try_enter(m, (opts | m->mtx_flags), file, line);
}
#endif /* WITNESS */
@ -344,13 +354,13 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
m->mtx_recurse++;
atomic_set_ptr(&m->mtx_lock, MTX_RECURSED);
if ((opts & MTX_QUIET) == 0)
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recurse", m);
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recursing", m);
return;
}
if ((opts & MTX_QUIET) == 0)
CTR3(KTR_LOCK, "mtx_lock: %p contested (lock=%p) [%p]", m,
(void *)m->mtx_lock, (void *)RETIP(m));
CTR3(KTR_LOCK, "_mtx_lock_sleep: %p contested (lock=%p) [%p]",
m, (void *)m->mtx_lock, (void *)RETIP(m));
/*
* Save our priority. Even though p_nativepri is protected by
@ -383,8 +393,7 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
*/
if (v == MTX_CONTESTED) {
p1 = TAILQ_FIRST(&m->mtx_blocked);
KASSERT(p1 != NULL,
("contested mutex has no contesters"));
MPASS(p1 != NULL);
m->mtx_lock = (uintptr_t)p | MTX_CONTESTED;
if (p1->p_priority < p->p_priority)
@ -421,7 +430,7 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
if (it->it_interrupted) {
if ((opts & MTX_QUIET) == 0)
CTR2(KTR_LOCK,
"mtx_lock: 0x%x interrupted 0x%x",
"_mtx_lock_sleep: 0x%x interrupted 0x%x",
it, it->it_interrupted);
intr_thd_fixup(it);
}
@ -486,7 +495,7 @@ _mtx_lock_spin(struct mtx *m, int opts, u_int mtx_intr, const char *file,
int i = 0;
if ((opts & MTX_QUIET) == 0)
CTR1(KTR_LOCK, "mtx_lock_spin: %p spinning", m);
CTR1(KTR_LOCK, "_mtx_lock_spin: %p spinning", m);
for (;;) {
if (_obtain_lock(m, CURPROC))
@ -530,10 +539,6 @@ _mtx_unlock_sleep(struct mtx *m, int opts, const char *file, int line)
p = CURPROC;
MPASS4(mtx_owned(m), "mtx_owned(mpp)", file, line);
if ((opts & MTX_QUIET) == 0)
CTR5(KTR_LOCK, "REL %s [%p] r=%d at %s:%d", m->mtx_description,
m, m->mtx_recurse, file, line);
if (mtx_recursed(m)) {
if (--(m->mtx_recurse) == 0)
atomic_clear_ptr(&m->mtx_lock, MTX_RECURSED);

33
sys/kern/subr_witness.c
View File

@ -162,6 +162,14 @@ static struct mtx all_mtx = { MTX_UNOWNED, 0, 0, 0, "All mutexes queue head",
static int mtx_cur_cnt;
static int mtx_max_cnt;
/*
* Couple of strings for KTR_LOCK tracing in order to avoid duplicates.
*/
char STR_mtx_lock_slp[] = "GOT (sleep) %s [%p] r=%d at %s:%d";
char STR_mtx_unlock_slp[] = "REL (sleep) %s [%p] r=%d at %s:%d";
char STR_mtx_lock_spn[] = "GOT (spin) %s [%p] r=%d at %s:%d";
char STR_mtx_unlock_spn[] = "REL (spin) %s [%p] r=%d at %s:%d";
/*
* Prototypes for non-exported routines.
*
@ -302,12 +310,13 @@ _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
{
int rval;
KASSERT(CURPROC != NULL, ("curproc is NULL in _mtx_trylock"));
MPASS(CURPROC != NULL);
/*
* _mtx_trylock does not accept MTX_NOSWITCH option.
*/
MPASS((opts & MTX_NOSWITCH) == 0);
KASSERT((opts & MTX_NOSWITCH) == 0,
("mtx_trylock() called with invalid option flag(s) %d", opts));
rval = _obtain_lock(m, CURTHD);
@ -317,7 +326,8 @@ _mtx_trylock(struct mtx *m, int opts, const char *file, int line)
* We do not handle recursion in _mtx_trylock; see the
* note at the top of the routine.
*/
MPASS(!mtx_recursed(m));
KASSERT(!mtx_recursed(m),
("mtx_trylock() called on a recursed mutex"));
witness_try_enter(m, (opts | m->mtx_flags), file, line);
}
#endif /* WITNESS */
@ -344,13 +354,13 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
m->mtx_recurse++;
atomic_set_ptr(&m->mtx_lock, MTX_RECURSED);
if ((opts & MTX_QUIET) == 0)
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recurse", m);
CTR1(KTR_LOCK, "_mtx_lock_sleep: %p recursing", m);
return;
}
if ((opts & MTX_QUIET) == 0)
CTR3(KTR_LOCK, "mtx_lock: %p contested (lock=%p) [%p]", m,
(void *)m->mtx_lock, (void *)RETIP(m));
CTR3(KTR_LOCK, "_mtx_lock_sleep: %p contested (lock=%p) [%p]",
m, (void *)m->mtx_lock, (void *)RETIP(m));
/*
* Save our priority. Even though p_nativepri is protected by
@ -383,8 +393,7 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
*/
if (v == MTX_CONTESTED) {
p1 = TAILQ_FIRST(&m->mtx_blocked);
KASSERT(p1 != NULL,
("contested mutex has no contesters"));
MPASS(p1 != NULL);
m->mtx_lock = (uintptr_t)p | MTX_CONTESTED;
if (p1->p_priority < p->p_priority)
@ -421,7 +430,7 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
if (it->it_interrupted) {
if ((opts & MTX_QUIET) == 0)
CTR2(KTR_LOCK,
"mtx_lock: 0x%x interrupted 0x%x",
"_mtx_lock_sleep: 0x%x interrupted 0x%x",
it, it->it_interrupted);
intr_thd_fixup(it);
}
@ -486,7 +495,7 @@ _mtx_lock_spin(struct mtx *m, int opts, u_int mtx_intr, const char *file,
int i = 0;
if ((opts & MTX_QUIET) == 0)
CTR1(KTR_LOCK, "mtx_lock_spin: %p spinning", m);
CTR1(KTR_LOCK, "_mtx_lock_spin: %p spinning", m);
for (;;) {
if (_obtain_lock(m, CURPROC))
@ -530,10 +539,6 @@ _mtx_unlock_sleep(struct mtx *m, int opts, const char *file, int line)
p = CURPROC;
MPASS4(mtx_owned(m), "mtx_owned(mpp)", file, line);
if ((opts & MTX_QUIET) == 0)
CTR5(KTR_LOCK, "REL %s [%p] r=%d at %s:%d", m->mtx_description,
m, m->mtx_recurse, file, line);
if (mtx_recursed(m)) {
if (--(m->mtx_recurse) == 0)
atomic_clear_ptr(&m->mtx_lock, MTX_RECURSED);

40
sys/sys/mutex.h
View File

@ -107,6 +107,14 @@ struct mtx {
#ifdef _KERNEL
/*
* Strings for KTR_LOCK tracing.
*/
extern char STR_mtx_lock_slp[];
extern char STR_mtx_lock_spn[];
extern char STR_mtx_unlock_slp[];
extern char STR_mtx_unlock_spn[];
/*
* Prototypes
*
@ -244,30 +252,44 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
#define mtx_lock(m) do { \
MPASS(CURPROC != NULL); \
_get_sleep_lock((m), CURTHD, 0); \
CTR5(KTR_LOCK, STR_mtx_lock_slp, (m)->mtx_description, (m), \
(m)->mtx_recurse, __FILE__, __LINE__); \
WITNESS_ENTER((m), (m)->mtx_flags, __FILE__, __LINE__); \
} while (0)
#define mtx_lock_spin(m) do { \
MPASS(CURPROC != NULL); \
_get_spin_lock((m), CURTHD, 0); \
CTR5(KTR_LOCK, STR_mtx_lock_spn, (m)->mtx_description, (m), \
(m)->mtx_recurse, __FILE__, __LINE__); \
WITNESS_ENTER((m), (m)->mtx_flags, __FILE__, __LINE__); \
} while (0)
#define mtx_unlock(m) do { \
MPASS(CURPROC != NULL); \
WITNESS_EXIT((m), (m)->mtx_flags, __FILE__, __LINE__); \
mtx_assert((m), MA_OWNED); \
_rel_sleep_lock((m), CURTHD, 0); \
CTR5(KTR_LOCK, STR_mtx_unlock_slp, (m)->mtx_description, (m), \
(m)->mtx_recurse, __FILE__, __LINE__); \
} while (0)
#define mtx_unlock_spin(m) do { \
MPASS(CURPROC != NULL); \
WITNESS_EXIT((m), (m)->mtx_flags, __FILE__, __LINE__); \
mtx_assert((m), MA_OWNED); \
_rel_spin_lock((m)); \
CTR5(KTR_LOCK, STR_mtx_unlock_spn, (m)->mtx_description, (m), \
(m)->mtx_recurse, __FILE__, __LINE__); \
} while (0)
#define mtx_lock_flags(m, opts) do { \
MPASS(CURPROC != NULL); \
_get_sleep_lock((m), CURTHD, (opts)); \
if (((opts) & MTX_QUIET) == 0) \
CTR5(KTR_LOCK, STR_mtx_lock_slp, \
(m)->mtx_description, (m), (m)->mtx_recurse, \
__FILE__, __LINE__); \
WITNESS_ENTER((m), ((m)->mtx_flags | (opts)), __FILE__, \
__LINE__); \
} while (0)
@ -275,6 +297,10 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
#define mtx_lock_spin_flags(m, opts) do { \
MPASS(CURPROC != NULL); \
_get_spin_lock((m), CURTHD, (opts)); \
if (((opts) & MTX_QUIET) == 0) \
CTR5(KTR_LOCK, STR_mtx_lock_spn, \
(m)->mtx_description, (m), (m)->mtx_recurse, \
__FILE__, __LINE__); \
WITNESS_ENTER((m), ((m)->mtx_flags | (opts)), __FILE__, \
__LINE__); \
} while (0)
@ -283,7 +309,12 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
MPASS(CURPROC != NULL); \
WITNESS_EXIT((m), ((m)->mtx_flags | (opts)), __FILE__, \
__LINE__); \
mtx_assert((m), MA_OWNED); \
_rel_sleep_lock((m), CURTHD, (opts)); \
if (((opts) & MTX_QUIET) == 0) \
CTR5(KTR_LOCK, STR_mtx_unlock_slp, \
(m)->mtx_description, (m), (m)->mtx_recurse, \
__FILE__, __LINE__); \
} while (0)
/*
@ -295,11 +326,12 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
MPASS(CURPROC != NULL); \
WITNESS_EXIT((m), ((m)->mtx_flags | (opts)), __FILE__, \
__LINE__); \
if (((opts) & MTX_QUIET) == 0) \
CTR5(KTR_LOCK, "REL %s [%p] r=%d at %s:%d", \
(m)->mtx_description, (m), (m)->mtx_recurse, \
__FILE__, __LINE__); \
mtx_assert((m), MA_OWNED); \
_rel_spin_lock((m)); \
if (((opts) & MTX_QUIET) == 0) \
CTR5(KTR_LOCK, STR_mtx_unlock_spn, \
(m)->mtx_description, (m), (m)->mtx_recurse, \
__FILE__, __LINE__); \
} while (0)
#define mtx_trylock(m) \