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From: <sjpark@amazon.com>
To: <akpm@linux-foundation.org>
Cc: SeongJae Park <sjpark@amazon.de>, <acme@kernel.org>,
	<alexander.shishkin@linux.intel.com>, <amit@kernel.org>,
	<brendan.d.gregg@gmail.com>, <brendanhiggins@google.com>,
	<cai@lca.pw>, <colin.king@canonical.com>, <corbet@lwn.net>,
	<dwmw@amazon.com>, <jolsa@redhat.com>, <kirill@shutemov.name>,
	<mark.rutland@arm.com>, <mgorman@suse.de>, <minchan@kernel.org>,
	<mingo@redhat.com>, <namhyung@kernel.org>, <peterz@infradead.org>,
	<rdunlap@infradead.org>, <rostedt@goodmis.org>,
	<sj38.park@gmail.com>, <vdavydov.dev@gmail.com>,
	<linux-mm@kvack.org>, <linux-doc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Subject: [PATCH v4 07/11] mm/damon: Add a tracepoint for result writing
Date: Mon, 10 Feb 2020 15:52:06 +0100
Message-ID: <20200210145206.27950-1-sjpark@amazon.com> (raw)
In-Reply-To: <20200210144812.26845-1-sjpark@amazon.com>

From: SeongJae Park <sjpark@amazon.de>

This commit adds a tracepoint for DAMON's result buffer writing.  It is
called for each writing of the DAMON results and print the result data.
Therefore, it would be used to easily integrated with other tracepoint
supporting tracers such as perf.

Signed-off-by: SeongJae Park <sjpark@amazon.de>
---
 include/trace/events/damon.h | 32 ++++++++++++++++++++++++++++++++
 mm/damon.c                   |  4 ++++
 2 files changed, 36 insertions(+)
 create mode 100644 include/trace/events/damon.h

diff --git a/include/trace/events/damon.h b/include/trace/events/damon.h
new file mode 100644
index 000000000000..fb33993620ce
--- /dev/null
+++ b/include/trace/events/damon.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM damon
+
+#if !defined(_TRACE_DAMON_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_DAMON_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(damon_write_rbuf,
+
+	TP_PROTO(void *buf, const ssize_t sz),
+
+	TP_ARGS(buf, sz),
+
+	TP_STRUCT__entry(
+		__dynamic_array(char, buf, sz)
+	),
+
+	TP_fast_assign(
+		memcpy(__get_dynamic_array(buf), buf, sz);
+	),
+
+	TP_printk("dat=%s", __print_hex(__get_dynamic_array(buf),
+			__get_dynamic_array_len(buf)))
+);
+
+#endif /* _TRACE_DAMON_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/mm/damon.c b/mm/damon.c
index 748cd8537fee..02bfa12940ea 100644
--- a/mm/damon.c
+++ b/mm/damon.c
@@ -9,6 +9,8 @@
 
 #define pr_fmt(fmt) "damon: " fmt
 
+#define CREATE_TRACE_POINTS
+
 #include <linux/damon.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
@@ -20,6 +22,7 @@
 #include <linux/sched/mm.h>
 #include <linux/sched/task.h>
 #include <linux/slab.h>
+#include <trace/events/damon.h>
 
 #define damon_get_task_struct(t) \
 	(get_pid_task(find_vpid(t->pid), PIDTYPE_PID))
@@ -553,6 +556,7 @@ static void damon_flush_rbuffer(struct damon_ctx *ctx)
  */
 static void damon_write_rbuf(struct damon_ctx *ctx, void *data, ssize_t size)
 {
+	trace_damon_write_rbuf(data, size);
 	if (!ctx->rbuf_len || !ctx->rbuf)
 		return;
 	if (ctx->rbuf_offset + size > ctx->rbuf_len)
-- 
2.17.1



  parent reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-10 14:48 [PATCH v4 00/11] Introduce Data Access MONitor (DAMON) sjpark
2020-02-10 14:48 ` [PATCH v4 01/11] mm: " sjpark
2020-02-10 14:48 ` [PATCH v4 02/11] mm/damon: Implement region based sampling sjpark
2020-02-10 14:48 ` [PATCH v4 03/11] mm/damon: Adaptively adjust regions sjpark
2020-02-10 14:48 ` [PATCH v4 04/11] mm/damon: Apply dynamic memory mapping changes sjpark
2020-02-10 14:50 ` [PATCH v4 05/11] mm/damon: Implement kernel space API sjpark
2020-02-12 23:21   ` kbuild test robot
2020-02-13  9:09     ` SeongJae Park
2020-02-10 14:51 ` [PATCH v4 06/11] mm/damon: Add debugfs interface sjpark
2020-02-10 14:52 ` sjpark [this message]
2020-02-10 14:52 ` [PATCH v4 08/11] tools: Add a minimal user-space tool for DAMON sjpark
2020-02-10 14:53 ` [PATCH v4 09/11] Documentation/admin-guide/mm: Add a document " sjpark
2020-02-10 14:53 ` [PATCH v4 10/11] mm/damon: Add kunit tests sjpark
2020-02-11 22:21   ` Brendan Higgins
2020-02-13 16:56   ` kbuild test robot
2020-02-14 11:19     ` SeongJae Park
2020-02-15  4:07   ` Randy Dunlap
2020-02-15  6:52     ` SeongJae Park
2020-02-10 14:54 ` [PATCH v4 11/11] MAINTAINERS: Update for DAMON sjpark

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