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authorLi Zefan <lizf@cn.fujitsu.com>2009-03-25 17:21:26 +0800
committerIngo Molnar <mingo@elte.hu>2009-03-31 17:27:08 +0200
commit5554720482a631702146a959db22fe417740e0a6 (patch)
treefd7a304638269e3b3826faeb5dbc35f04af4deeb
parentb5230b56ee6caeb27cedb7753c0c319646383bb4 (diff)
blktrace: fix the original blktrace
Currently the original blktrace, which is using relay and is used via ioctl, is broken. You can use ftrace to see the output of blktrace, but user-space blktrace is unusable. It's broken by "blktrace: add ftrace plugin" (c71a896154119f4ca9e89d6078f5f63ad60ef199) - if (unlikely(bt->trace_state != Blktrace_running)) + if (unlikely(bt->trace_state != Blktrace_running || !blk_tracer_enabled)) return; With this patch, both ioctl and ftrace can be used, but of course you can't use both of them at the same time. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Jens Axboe <jens.axboe@oracle.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/blktrace.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 95f89faca73..a7f7ff5db38 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -110,7 +110,7 @@ void __trace_note_message(struct blk_trace *bt, const char *fmt, ...)
unsigned long flags;
char *buf;
- if (blk_tr) {
+ if (blk_tracer_enabled) {
va_start(args, fmt);
ftrace_vprintk(fmt, args);
va_end(args);
@@ -169,7 +169,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
pid_t pid;
int cpu, pc = 0;
- if (unlikely(bt->trace_state != Blktrace_running ||
+ if (unlikely(bt->trace_state != Blktrace_running &&
!blk_tracer_enabled))
return;
@@ -185,7 +185,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
return;
cpu = raw_smp_processor_id();
- if (blk_tr) {
+ if (blk_tracer_enabled) {
tracing_record_cmdline(current);
pc = preempt_count();
@@ -235,7 +235,7 @@ record_it:
if (pdu_len)
memcpy((void *) t + sizeof(*t), pdu_data, pdu_len);
- if (blk_tr) {
+ if (blk_tracer_enabled) {
trace_buffer_unlock_commit(blk_tr, event, 0, pc);
return;
}
@@ -267,8 +267,7 @@ int blk_trace_remove(struct request_queue *q)
if (!bt)
return -EINVAL;
- if (bt->trace_state == Blktrace_setup ||
- bt->trace_state == Blktrace_stopped)
+ if (bt->trace_state != Blktrace_running)
blk_trace_cleanup(bt);
return 0;
@@ -1273,7 +1272,6 @@ static int blk_trace_setup_queue(struct request_queue *q, dev_t dev)
bt->dev = dev;
bt->act_mask = (u16)-1;
bt->end_lba = -1ULL;
- bt->trace_state = Blktrace_running;
old_bt = xchg(&q->blk_trace, bt);
if (old_bt != NULL) {