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From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: SeongJae Park <sjpark@amazon.com>
Cc: <akpm@linux-foundation.org>, SeongJae Park <sjpark@amazon.de>,
	<aarcange@redhat.com>, <yang.shi@linux.alibaba.com>,
	<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>, <rientjes@google.com>,
	<rostedt@goodmis.org>, <shuah@kernel.org>, <sj38.park@gmail.com>,
	<vbabka@suse.cz>, <vdavydov.dev@gmail.com>, <linux-mm@kvack.org>,
	<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v6 09/14] mm/damon: Add a tracepoint for result writing
Date: Tue, 10 Mar 2020 09:03:31 +0000
Message-ID: <20200310090331.00006596@Huawei.com> (raw)
In-Reply-To: <20200224123047.32506-10-sjpark@amazon.com>

On Mon, 24 Feb 2020 13:30:42 +0100
SeongJae Park <sjpark@amazon.com> wrote:

> 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>

I'm curious, why at the flush of rbuf rather than using a more structured trace
point for each of the writes into rbuf?

Seems it would make more sense to have a tracepoint for each record write out.
Probably at the level of each task, though might be more elegant to do it at the
level of each region within a task and duplicate the header stuff.

> ---
>  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 facb1d7f121b..8faf3879f99e 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)




  reply index

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24 12:30 [PATCH v6 00/14] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-02-24 12:30 ` [PATCH v6 01/14] mm: " SeongJae Park
2020-03-10  8:54   ` Jonathan Cameron
2020-03-10 11:50     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 02/14] mm/damon: Implement region based sampling SeongJae Park
2020-03-10  8:57   ` Jonathan Cameron
2020-03-10 11:52     ` SeongJae Park
2020-03-10 15:55       ` Jonathan Cameron
2020-03-10 16:22         ` SeongJae Park
2020-03-10 17:39           ` Jonathan Cameron
2020-03-12  9:20             ` SeongJae Park
2020-03-13 17:29   ` Jonathan Cameron
2020-03-13 20:16     ` SeongJae Park
2020-03-17 11:32       ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 03/14] mm/damon: Adaptively adjust regions SeongJae Park
2020-03-10  8:57   ` Jonathan Cameron
2020-03-10 11:53     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 04/14] mm/damon: Apply dynamic memory mapping changes SeongJae Park
2020-03-10  9:00   ` Jonathan Cameron
2020-03-10 11:53     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 05/14] mm/damon: Implement callbacks SeongJae Park
2020-03-10  9:01   ` Jonathan Cameron
2020-03-10 11:55     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 06/14] mm/damon: Implement access pattern recording SeongJae Park
2020-03-10  9:01   ` Jonathan Cameron
2020-03-10 11:55     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 07/14] mm/damon: Implement kernel space API SeongJae Park
2020-03-10  9:01   ` Jonathan Cameron
2020-03-10 11:56     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 08/14] mm/damon: Add debugfs interface SeongJae Park
2020-03-10  9:02   ` Jonathan Cameron
2020-03-10 11:56     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 09/14] mm/damon: Add a tracepoint for result writing SeongJae Park
2020-03-10  9:03   ` Jonathan Cameron [this message]
2020-03-10 11:57     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 10/14] tools: Add a minimal user-space tool for DAMON SeongJae Park
2020-02-24 12:30 ` [PATCH v6 11/14] Documentation/admin-guide/mm: Add a document " SeongJae Park
2020-03-10  9:03   ` Jonathan Cameron
2020-03-10 11:57     ` SeongJae Park
2020-02-24 12:30 ` [PATCH v6 12/14] mm/damon: Add kunit tests SeongJae Park
2020-02-24 12:30 ` [PATCH v6 13/14] mm/damon: Add user selftests SeongJae Park
2020-02-24 12:30 ` [PATCH v6 14/14] MAINTAINERS: Update for DAMON SeongJae Park
2020-03-02 11:35 ` [PATCH v6 00/14] Introduce Data Access MONitor (DAMON) SeongJae Park
2020-03-09 10:23   ` SeongJae Park
2020-03-10 17:21 ` Shakeel Butt
2020-03-12 10:07   ` SeongJae Park
2020-03-12 10:43     ` SeongJae Park
2020-03-18 19:52       ` Shakeel Butt
2020-03-19  9:03         ` SeongJae Park
2020-03-23 17:29           ` Shakeel Butt
2020-03-24  8:34             ` SeongJae Park

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