Re: [PATCH v3 2/2] mm/migrate: add nr_split to trace_mm_migrate_pages stats.

[Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>]

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

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

> ---
>   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;