diff options
Diffstat (limited to 'module')
| -rw-r--r-- | module/zfs/zfs_debug.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/module/zfs/zfs_debug.c b/module/zfs/zfs_debug.c index ad611ac91..29423303f 100644 --- a/module/zfs/zfs_debug.c +++ b/module/zfs/zfs_debug.c @@ -25,6 +25,13 @@ #include <sys/zfs_context.h> +#if !defined(_KERNEL) || !defined(__linux__) +list_t zfs_dbgmsgs; +int zfs_dbgmsg_size; +kmutex_t zfs_dbgmsgs_lock; +int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */ +#endif + /* * Enable various debugging features. */ @@ -57,6 +64,12 @@ zfs_panic_recover(const char *fmt, ...) void zfs_dbgmsg_init(void) { +#if !defined(_KERNEL) || !defined(__linux__) + list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t), + offsetof(zfs_dbgmsg_t, zdm_node)); + mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL); +#endif + if (zfs_flags == 0) { #if defined(_KERNEL) zfs_flags = ZFS_DEBUG_DPRINTF; @@ -71,9 +84,64 @@ zfs_dbgmsg_init(void) void zfs_dbgmsg_fini(void) { +#if !defined(_KERNEL) || !defined(__linux__) + zfs_dbgmsg_t *zdm; + + while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) { + int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg); + kmem_free(zdm, size); + zfs_dbgmsg_size -= size; + } + mutex_destroy(&zfs_dbgmsgs_lock); + ASSERT0(zfs_dbgmsg_size); +#endif return; } +#if !defined(_KERNEL) || !defined(__linux__) +/* + * Print these messages by running: + * echo ::zfs_dbgmsg | mdb -k + * + * Monitor these messages by running: + * dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}' + */ +void +zfs_dbgmsg(const char *fmt, ...) +{ + int size; + va_list adx; + zfs_dbgmsg_t *zdm; + + va_start(adx, fmt); + size = vsnprintf(NULL, 0, fmt, adx); + va_end(adx); + + /* + * There is one byte of string in sizeof (zfs_dbgmsg_t), used + * for the terminating null. + */ + zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP); + zdm->zdm_timestamp = gethrestime_sec(); + + va_start(adx, fmt); + (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx); + va_end(adx); + + DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg); + + mutex_enter(&zfs_dbgmsgs_lock); + list_insert_tail(&zfs_dbgmsgs, zdm); + zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size; + while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) { + zdm = list_remove_head(&zfs_dbgmsgs); + size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg); + kmem_free(zdm, size); + zfs_dbgmsg_size -= size; + } + mutex_exit(&zfs_dbgmsgs_lock); +} +#endif #if defined(_KERNEL) module_param(zfs_flags, int, 0644); |