From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Yordan Karadzhov (VMware)" <y.karadz@gmail.com>
Subject: [for-next][PATCH 4/7] tracing: Add method for recording "func_repeats" events
Date: Fri, 16 Apr 2021 13:26:16 -0400 [thread overview]
Message-ID: <20210416172656.823902929@goodmis.org> (raw)
In-Reply-To: 20210416172612.086725495@goodmis.org
From: "Yordan Karadzhov (VMware)" <y.karadz@gmail.com>
This patch only provides the implementation of the method.
Later we will used it in a combination with a new option for
function tracing.
Link: https://lkml.kernel.org/r/20210415181854.147448-5-y.karadz@gmail.com
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
---
kernel/trace/trace.c | 34 ++++++++++++++++++++++++++++++++++
kernel/trace/trace.h | 4 ++++
2 files changed, 38 insertions(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 82833be07c1e..66a4ad93b5e9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3117,6 +3117,40 @@ static void ftrace_trace_userstack(struct trace_array *tr,
#endif /* CONFIG_STACKTRACE */
+static inline void
+func_repeats_set_delta_ts(struct func_repeats_entry *entry,
+ unsigned long long delta)
+{
+ entry->bottom_delta_ts = delta & U32_MAX;
+ entry->top_delta_ts = (delta >> 32);
+}
+
+void trace_last_func_repeats(struct trace_array *tr,
+ struct trace_func_repeats *last_info,
+ unsigned int trace_ctx)
+{
+ struct trace_buffer *buffer = tr->array_buffer.buffer;
+ struct func_repeats_entry *entry;
+ struct ring_buffer_event *event;
+ u64 delta;
+
+ event = __trace_buffer_lock_reserve(buffer, TRACE_FUNC_REPEATS,
+ sizeof(*entry), trace_ctx);
+ if (!event)
+ return;
+
+ delta = ring_buffer_event_time_stamp(buffer, event) -
+ last_info->ts_last_call;
+
+ entry = ring_buffer_event_data(event);
+ entry->ip = last_info->ip;
+ entry->parent_ip = last_info->parent_ip;
+ entry->count = last_info->count;
+ func_repeats_set_delta_ts(entry, delta);
+
+ __buffer_unlock_commit(buffer, event);
+}
+
/* created for use with alloc_percpu */
struct trace_buffer_struct {
int nesting;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index a4f1b66049fd..cd80d046c7a5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -695,6 +695,10 @@ static inline void __trace_stack(struct trace_array *tr, unsigned int trace_ctx,
}
#endif /* CONFIG_STACKTRACE */
+void trace_last_func_repeats(struct trace_array *tr,
+ struct trace_func_repeats *last_info,
+ unsigned int trace_ctx);
+
extern u64 ftrace_now(int cpu);
extern void trace_find_cmdline(int pid, char comm[]);
--
2.30.1
next prev parent reply other threads:[~2021-04-16 17:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 17:26 [for-next][PATCH 0/7] tracing: Add func_no_repeats option Steven Rostedt
2021-04-16 17:26 ` [for-next][PATCH 1/7] tracing: Define static void trace_print_time() Steven Rostedt
2021-04-16 17:26 ` [for-next][PATCH 2/7] tracing: Define new ftrace event "func_repeats" Steven Rostedt
2021-04-16 17:26 ` [for-next][PATCH 3/7] tracing: Add "last_func_repeats" to struct trace_array Steven Rostedt
2021-04-16 17:26 ` Steven Rostedt [this message]
2021-04-16 17:26 ` [for-next][PATCH 5/7] tracing: Unify the logic for function tracing options Steven Rostedt
2021-04-16 17:26 ` [for-next][PATCH 6/7] tracing: Add "func_no_repeats" option for function tracing Steven Rostedt
2021-04-16 17:26 ` [for-next][PATCH 7/7] ftrace: Reuse the output of the function tracer for func_repeats Steven Rostedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210416172656.823902929@goodmis.org \
--to=rostedt@goodmis.org \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@kernel.org \
--cc=y.karadz@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).