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Add block device tracing facility

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The implementation is in libblockdriver, and works transparently for
all block drivers. The new btrace(8) tool can be used to control block
tracing; see ``man btrace'' for details.
This commit is contained in:
David van Moolenbroek
2011-11-25 13:47:21 +01:00
parent a9f89a7290
commit fd4c2b74f3
20 changed files with 682 additions and 30 deletions
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lib/libblockdriver/driver_mt.c
+7 -7
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@@ -40,9 +40,9 @@ PRIVATE int running = FALSE;
PRIVATE mthread_key_t worker_key;
PRIVATE worker_t worker[DRIVER_MT_MAX_WORKERS];
PRIVATE worker_t worker[BLOCKDRIVER_MT_MAX_WORKERS];
PRIVATE worker_t *exited[DRIVER_MT_MAX_WORKERS];
PRIVATE worker_t *exited[BLOCKDRIVER_MT_MAX_WORKERS];
PRIVATE int num_exited = 0;
/*===========================================================================*
@@ -126,7 +126,7 @@ PRIVATE void *worker_thread(void *param)
wp->state = STATE_RUNNING;
/* Handle the request, and send a reply. */
r = blockdriver_handle_request(bdtab, &m);
r = blockdriver_handle_request(bdtab, &m, wp->id);
blockdriver_reply(&m, ipc_status, r);
}
@@ -223,7 +223,7 @@ PRIVATE void master_handle_request(message *m_ptr, int ipc_status)
*/
if (!IS_BDEV_RQ(m_ptr->m_type)) {
/* Process as 'other' message. */
r = blockdriver_handle_request(bdtab, m_ptr);
r = blockdriver_handle_request(bdtab, m_ptr, MAIN_THREAD);
blockdriver_reply(m_ptr, ipc_status, r);
@@ -240,7 +240,7 @@ PRIVATE void master_handle_request(message *m_ptr, int ipc_status)
}
/* Start the thread if it is not already running. */
assert(thread_id >= 0 && thread_id < DRIVER_MT_MAX_WORKERS);
assert(thread_id >= 0 && thread_id < BLOCKDRIVER_MT_MAX_WORKERS);
wp = &worker[thread_id];
@@ -269,7 +269,7 @@ PRIVATE void master_init(struct blockdriver *bdp)
bdtab = bdp;
for (i = 0; i < DRIVER_MT_MAX_WORKERS; i++)
for (i = 0; i < BLOCKDRIVER_MT_MAX_WORKERS; i++)
worker[i].state = STATE_DEAD;
/* Initialize a per-thread key, where each worker thread stores its own
@@ -368,7 +368,7 @@ PUBLIC void blockdriver_mt_wakeup(thread_id_t id)
*/
worker_t *wp;
assert(id >= 0 && id < DRIVER_MT_MAX_WORKERS);
assert(id >= 0 && id < BLOCKDRIVER_MT_MAX_WORKERS);
wp = &worker[id];