linux-kernel - Re: [PATCH v3 2/2] mm/migrate: add nr_split to trace_mm_migrate

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Date:   Thu, 19 Oct 2023 19:07:58 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Zi Yan <ziy@...dia.com>, Huang Ying <ying.huang@...el.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH v3 2/2] mm/migrate: add nr_split to trace_mm_migrate_pages
 stats.



On 10/18/2023 12:31 AM, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> Add nr_split to trace_mm_migrate_pages for large folio (including THP)
> split events.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> Cc: Baolin Wang <baolin.wang@...ux.alibaba.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Huang Ying <ying.huang@...el.com>
> Cc: Matthew Wilcox <willy@...radead.org>

LGTM. Feel free to add:
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
>   include/trace/events/migrate.h | 24 ++++++++++++++----------
>   mm/migrate.c                   |  3 ++-
>   2 files changed, 16 insertions(+), 11 deletions(-)
> 
> diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h
> index 061b5128f335..0190ef725b43 100644
> --- a/include/trace/events/migrate.h
> +++ b/include/trace/events/migrate.h
> @@ -49,10 +49,11 @@ TRACE_EVENT(mm_migrate_pages,
>   
>   	TP_PROTO(unsigned long succeeded, unsigned long failed,
>   		 unsigned long thp_succeeded, unsigned long thp_failed,
> -		 unsigned long thp_split, enum migrate_mode mode, int reason),
> +		 unsigned long thp_split, unsigned long large_folio_split,
> +		 enum migrate_mode mode, int reason),
>   
>   	TP_ARGS(succeeded, failed, thp_succeeded, thp_failed,
> -		thp_split, mode, reason),
> +		thp_split, large_folio_split, mode, reason),
>   
>   	TP_STRUCT__entry(
>   		__field(	unsigned long,		succeeded)
> @@ -60,26 +61,29 @@ TRACE_EVENT(mm_migrate_pages,
>   		__field(	unsigned long,		thp_succeeded)
>   		__field(	unsigned long,		thp_failed)
>   		__field(	unsigned long,		thp_split)
> +		__field(	unsigned long,		large_folio_split)
>   		__field(	enum migrate_mode,	mode)
>   		__field(	int,			reason)
>   	),
>   
>   	TP_fast_assign(
> -		__entry->succeeded	= succeeded;
> -		__entry->failed		= failed;
> -		__entry->thp_succeeded	= thp_succeeded;
> -		__entry->thp_failed	= thp_failed;
> -		__entry->thp_split	= thp_split;
> -		__entry->mode		= mode;
> -		__entry->reason		= reason;
> +		__entry->succeeded			= succeeded;
> +		__entry->failed				= failed;
> +		__entry->thp_succeeded		= thp_succeeded;
> +		__entry->thp_failed			= thp_failed;
> +		__entry->thp_split			= thp_split;
> +		__entry->large_folio_split	= large_folio_split;
> +		__entry->mode				= mode;
> +		__entry->reason				= reason;
>   	),
>   
> -	TP_printk("nr_succeeded=%lu nr_failed=%lu nr_thp_succeeded=%lu nr_thp_failed=%lu nr_thp_split=%lu mode=%s reason=%s",
> +	TP_printk("nr_succeeded=%lu nr_failed=%lu nr_thp_succeeded=%lu nr_thp_failed=%lu nr_thp_split=%lu nr_split=%lu mode=%s reason=%s",
>   		__entry->succeeded,
>   		__entry->failed,
>   		__entry->thp_succeeded,
>   		__entry->thp_failed,
>   		__entry->thp_split,
> +		__entry->large_folio_split,
>   		__print_symbolic(__entry->mode, MIGRATE_MODE),
>   		__print_symbolic(__entry->reason, MIGRATE_REASON))
>   );
> diff --git a/mm/migrate.c b/mm/migrate.c
> index fc2e70b17704..1fecebf4c301 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1979,7 +1979,8 @@ int migrate_pages(struct list_head *from, new_folio_t get_new_folio,
>   	count_vm_events(THP_MIGRATION_SPLIT, stats.nr_thp_split);
>   	trace_mm_migrate_pages(stats.nr_succeeded, stats.nr_failed_pages,
>   			       stats.nr_thp_succeeded, stats.nr_thp_failed,
> -			       stats.nr_thp_split, mode, reason);
> +			       stats.nr_thp_split, stats.nr_split, mode,
> +			       reason);
>   
>   	if (ret_succeeded)
>   		*ret_succeeded = stats.nr_succeeded;