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Add a new KTR type KTR_CONTENTION, and use it in the mutex code to

Browse source 
log the start and end of periods during which mtx_lock() is waiting
to acquire a sleep mutex. The log message includes the file and
line of both the waiter and the holder.

Reviewed by:	jhb, jake
This commit is contained in:
Ian Dowse 2002-08-26 18:39:38 +00:00
parent e7f52ff8bb
commit 02bd1bcd2a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=102450
3 changed files with 42 additions and 1 deletions
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20
sys/kern/kern_mutex.c
View file

@ -471,6 +471,9 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
#if defined(SMP) && defined(ADAPTIVE_MUTEXES)
struct thread *owner;
#endif
#ifdef KTR
int cont_logged = 0;
#endif
if ((m->mtx_lock & MTX_FLAGMASK) == (uintptr_t)td) {
m->mtx_recurse++;
@ -588,6 +591,16 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
else
TAILQ_INSERT_TAIL(&m->mtx_blocked, td, td_blkq);
}
#ifdef KTR
if (!cont_logged) {
CTR6(KTR_CONTENTION,
"contention: %p at %s:%d wants %s, taken by %s:%d",
td, file, line, m->mtx_object.lo_name,
WITNESS_FILE(&m->mtx_object),
WITNESS_LINE(&m->mtx_object));
cont_logged = 1;
}
#endif
/*
* Save who we're blocked on.
@ -613,6 +626,13 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
mtx_unlock_spin(&sched_lock);
}
#ifdef KTR
if (cont_logged) {
CTR4(KTR_CONTENTION,
"contention end: %s acquired by %p at %s:%d",
m->mtx_object.lo_name, td, file, line);
}
#endif
return;
}

20
sys/kern/subr_turnstile.c
View file

@ -471,6 +471,9 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
#if defined(SMP) && defined(ADAPTIVE_MUTEXES)
struct thread *owner;
#endif
#ifdef KTR
int cont_logged = 0;
#endif
if ((m->mtx_lock & MTX_FLAGMASK) == (uintptr_t)td) {
m->mtx_recurse++;
@ -588,6 +591,16 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
else
TAILQ_INSERT_TAIL(&m->mtx_blocked, td, td_blkq);
}
#ifdef KTR
if (!cont_logged) {
CTR6(KTR_CONTENTION,
"contention: %p at %s:%d wants %s, taken by %s:%d",
td, file, line, m->mtx_object.lo_name,
WITNESS_FILE(&m->mtx_object),
WITNESS_LINE(&m->mtx_object));
cont_logged = 1;
}
#endif
/*
* Save who we're blocked on.
@ -613,6 +626,13 @@ _mtx_lock_sleep(struct mtx *m, int opts, const char *file, int line)
mtx_unlock_spin(&sched_lock);
}
#ifdef KTR
if (cont_logged) {
CTR4(KTR_CONTENTION,
"contention end: %s acquired by %p at %s:%d",
m->mtx_object.lo_name, td, file, line);
}
#endif
return;
}

3
sys/sys/ktr.h
View file

@ -71,7 +71,8 @@
#define KTR_VM 0x00100000 /* The virtual memory system */
#define KTR_WITNESS 0x00200000
#define KTR_RUNQ 0x00400000 /* Run queue */
#define KTR_ALL 0x007fffff
#define KTR_CONTENTION 0x00800000 /* Lock contention */
#define KTR_ALL 0x00ffffff
/*
* Trace classes which can be assigned to particular use at compile time