linux-kernel - Re: [PATCH mm-new v5 1/5] mm: khugepaged: add trace_mm_khugepaged

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Message-ID: <6ed1e12d-ebd1-4627-a6fd-ad72f1c68fee@arm.com>
Date: Fri, 23 Jan 2026 15:55:36 +0530
From: Dev Jain <dev.jain@....com>
To: Vernon Yang <vernon2gm@...il.com>, akpm@...ux-foundation.org,
 david@...nel.org
Cc: lorenzo.stoakes@...cle.com, ziy@...dia.com, baohua@...nel.org,
 lance.yang@...ux.dev, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 Vernon Yang <yanglincheng@...inos.cn>
Subject: Re: [PATCH mm-new v5 1/5] mm: khugepaged: add
 trace_mm_khugepaged_scan event


On 23/01/26 1:52 pm, Vernon Yang wrote:
> From: Vernon Yang <yanglincheng@...inos.cn>
>
> Add mm_khugepaged_scan event to track the total time for full scan
> and the total number of pages scanned of khugepaged.
>
> Signed-off-by: Vernon Yang <yanglincheng@...inos.cn>
> Acked-by: David Hildenbrand (Red Hat) <david@...nel.org>
> Reviewed-by: Barry Song <baohua@...nel.org>
> Reviewed-by: Lance Yang <lance.yang@...ux.dev>

Reviewed-by: Dev Jain <dev.jain@....com>

> ---
>  include/trace/events/huge_memory.h | 25 +++++++++++++++++++++++++
>  mm/khugepaged.c                    |  2 ++
>  2 files changed, 27 insertions(+)
>
> diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
> index 4e41bff31888..384e29f6bef0 100644
> --- a/include/trace/events/huge_memory.h
> +++ b/include/trace/events/huge_memory.h
> @@ -237,5 +237,30 @@ TRACE_EVENT(mm_khugepaged_collapse_file,
>  		__print_symbolic(__entry->result, SCAN_STATUS))
>  );
>  
> +TRACE_EVENT(mm_khugepaged_scan,
> +
> +	TP_PROTO(struct mm_struct *mm, unsigned int progress,
> +		 bool full_scan_finished),
> +
> +	TP_ARGS(mm, progress, full_scan_finished),
> +
> +	TP_STRUCT__entry(
> +		__field(struct mm_struct *, mm)
> +		__field(unsigned int, progress)
> +		__field(bool, full_scan_finished)
> +	),
> +
> +	TP_fast_assign(
> +		__entry->mm = mm;
> +		__entry->progress = progress;
> +		__entry->full_scan_finished = full_scan_finished;
> +	),
> +
> +	TP_printk("mm=%p, progress=%u, full_scan_finished=%d",
> +		__entry->mm,
> +		__entry->progress,
> +		__entry->full_scan_finished)
> +);
> +
>  #endif /* __HUGE_MEMORY_H */
>  #include <trace/define_trace.h>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index e76f42243534..6f0f05148765 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -2535,6 +2535,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, enum scan_result
>  		collect_mm_slot(slot);
>  	}
>  
> +	trace_mm_khugepaged_scan(mm, progress, khugepaged_scan.mm_slot == NULL);
> +
>  	return progress;
>  }
>