From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
To: linux-btrace@vger.kernel.org
Subject: [RFC PATCH 31/39] blktrace: add trace event print helper
Date: Tue, 25 Aug 2020 22:10:01 +0000 [thread overview]
Message-ID: <20200825221009.6457-32-chaitanya.kulkarni@wdc.com> (raw)
Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
kernel/trace/blktrace.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index cbaf4e816959..6bd158d5454b 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -2447,12 +2447,51 @@ static enum print_line_t print_one_line(struct trace_iterator *iter,
return trace_handle_return(s);
}
+static enum print_line_t print_one_line_ext(struct trace_iterator *iter,
+ bool classic)
+{
+ struct trace_array *tr = iter->tr;
+ struct trace_seq *s = &iter->seq;
+ const struct blk_io_trace_ext *t;
+ u32 what;
+ bool long_act;
+ blk_log_action_t *log_action;
+ bool has_cg;
+
+ t = te_blk_io_trace_ext(iter->ent);
+ what = (t->action & ((1ULL << BLK_TC_SHIFT_EXT) - 1)) & ~__BLK_TA_CGROUP;
+ long_act = !!(tr->trace_flags & TRACE_ITER_VERBOSE);
+ log_action = classic ? &blk_log_action_classic_ext : &blk_log_action_ext;
+ has_cg = t->action & __BLK_TA_CGROUP;
+
+ if ((t->action & ~__BLK_TN_CGROUP) = BLK_TN_MESSAGE_EXT) {
+ log_action(iter, long_act ? "message" : "m", has_cg);
+ blk_log_msg_ext(s, iter->ent, has_cg);
+ return trace_handle_return(s);
+ }
+
+ if (unlikely(what = 0 || what >= ARRAY_SIZE(what2act_ext)))
+ trace_seq_printf(s, "Unknown action %x\n", what);
+ else {
+ log_action(iter, what2act_ext[what].act[long_act], has_cg);
+ what2act_ext[what].print(s, iter->ent, has_cg);
+ }
+
+ return trace_handle_return(s);
+}
+
static enum print_line_t blk_trace_event_print(struct trace_iterator *iter,
int flags, struct trace_event *event)
{
return print_one_line(iter, false);
}
+static enum print_line_t blk_trace_event_print_ext(struct trace_iterator *iter,
+ int flags, struct trace_event *event)
+{
+ return print_one_line_ext(iter, false);
+}
+
static void blk_trace_synthesize_old_trace(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
--
2.22.1
next reply other threads:[~2020-08-25 22:10 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-25 22:10 Chaitanya Kulkarni [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-11-05 2:40 [RFC PATCH 31/39] blktrace: add trace event print helper Chaitanya Kulkarni
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