linux-kernel - Re: [PATCH -next v4 2/2] mm: vmscan: add new event to trace shrink lru

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Date: Wed, 20 Dec 2023 12:36:44 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Bixuan Cui <cuibixuan@...o.com>
Cc: mhiramat@...nel.org, mathieu.desnoyers@...icios.com,
 akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, linux-mm@...ck.org,
 opensource.kernel@...o.com
Subject: Re: [PATCH -next v4 2/2] mm: vmscan: add new event to trace shrink
 lru

On Tue, 19 Dec 2023 17:21:23 -0800
Bixuan Cui <cuibixuan@...o.com> wrote:

> diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
> index b99cd28c9815..02868bdc5999 100644
> --- a/include/trace/events/vmscan.h
> +++ b/include/trace/events/vmscan.h
> @@ -395,7 +395,24 @@ TRACE_EVENT(mm_vmscan_write_folio,
>  		show_reclaim_flags(__entry->reclaim_flags))
>  );
>  
> -TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
> +TRACE_EVENT(mm_vmscan_lru_shrink_inactive_start,
> +
> +	TP_PROTO(int nid),
> +
> +	TP_ARGS(nid),
> +
> +	TP_STRUCT__entry(
> +		__field(int, nid)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->nid = nid;
> +	),
> +
> +	TP_printk("nid=%d", __entry->nid)
> +);
> +
> +TRACE_EVENT(mm_vmscan_lru_shrink_inactive_end,
>  
>  	TP_PROTO(int nid,
>  		unsigned long nr_scanned, unsigned long nr_reclaimed,
> @@ -446,7 +463,24 @@ TRACE_EVENT(mm_vmscan_lru_shrink_inactive,
>  		show_reclaim_flags(__entry->reclaim_flags))
>  );
>  
> -TRACE_EVENT(mm_vmscan_lru_shrink_active,
> +TRACE_EVENT(mm_vmscan_lru_shrink_active_start,
> +
> +	TP_PROTO(int nid),
> +
> +	TP_ARGS(nid),
> +
> +	TP_STRUCT__entry(
> +		__field(int, nid)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->nid = nid;
> +	),
> +
> +	TP_printk("nid=%d", __entry->nid)
> +);
> +
> +TRACE_EVENT(mm_vmscan_lru_shrink_active_end,
>  

These two events are identical, please use DECLARE_EVENT_CLASS and
DEFINE_EVENT macros:

DECLARE_EVENT_CLASS(mm_vmscan_lru_shrink_start_template,

	TP_PROTO(int nid),

	TP_ARGS(nid),

	TP_STRUCT__entry(
		__field(int, nid)
	),

	TP_fast_assign(
		__entry->nid = nid;
	),

	TP_printk("nid=%d", __entry->nid)
);

DEFINE_EVENT(mm_vmscan_lru_shrink_start_template, mm_vmscan_lru_shrink_inactive_start,
	TP_PROTO(int nid),
	TP_ARGS(nid)
);

DEFINE_EVENT(mm_vmscan_lru_shrink_start_template, mm_vmscan_lru_shrink_active_end,
	TP_PROTO(int nid),
	TP_ARGS(nid)
);

This saves a bit of memory footprint when doing so.

-- Steve