blktrace: make classic output more classic

Impact: fix ftrace plugin timestamp output

In the classic user-space blktrace, the output timestamp is sec.nsec
not sec.usec.

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>

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index d43cdac..5b28f0f 100644 (file)
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -994,8 +994,8 @@ static void get_pdu_remap(const struct trace_entry *ent,
 static int blk_log_action_iter(struct trace_iterator *iter, const char *act)
 {
        char rwbs[6];
-       unsigned long long ts  = ns2usecs(iter->ts);
-       unsigned long usec_rem = do_div(ts, USEC_PER_SEC);
+       unsigned long long ts  = iter->ts;
+       unsigned long nsec_rem = do_div(ts, NSEC_PER_SEC);
        unsigned secs          = (unsigned long)ts;
        const struct trace_entry *ent = iter->ent;
        const struct blk_io_trace *t = (const struct blk_io_trace *)ent;
@@ -1003,9 +1003,9 @@ static int blk_log_action_iter(struct trace_iterator *iter, const char *act)
        fill_rwbs(rwbs, t);
 
        return trace_seq_printf(&iter->seq,
-                               "%3d,%-3d %2d %5d.%06lu %5u %2s %3s ",
+                               "%3d,%-3d %2d %5d.%09lu %5u %2s %3s ",
                                MAJOR(t->device), MINOR(t->device), iter->cpu,
-                               secs, usec_rem, ent->pid, act, rwbs);
+                               secs, nsec_rem, ent->pid, act, rwbs);
 }
 
 static int blk_log_action_seq(struct trace_seq *s, const struct blk_io_trace *t,