linux-kernel - Re: [PATCH v2 1/2] khugepaged: Refactor trace_mm_collapse_huge_page

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Message-ID: <4cc73e33-f703-40af-9099-ebced9273778@os.amperecomputing.com>
Date: Mon, 21 Apr 2025 15:38:40 -0700
From: Yang Shi <yang@...amperecomputing.com>
To: nifan.cxl@...il.com, rostedt@...dmis.org, mhiramat@...nel.org,
 willy@...radead.org
Cc: akpm@...ux-foundation.org, david@...hat.com, fan.ni@...sung.com,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-mm@...ck.org, npache@...hat.com, mcgrof@...nel.org,
 a.manzanares@...sung.com, dave@...olabs.net,
 Baolin Wang <baolin.wang@...ux.alibaba.com>
Subject: Re: [PATCH v2 1/2] khugepaged: Refactor
 trace_mm_collapse_huge_page_isolate() to take folio instead of page



On 4/18/25 11:34 AM, nifan.cxl@...il.com wrote:
> From: Fan Ni <fan.ni@...sung.com>
>
> trace_mm_collapse_huge_page_isolate() is only used in
> __collapse_huge_page_isolate(), which passes in the head page of a
> folio, so refactor it to take folio directly.
>
> Signed-off-by: Fan Ni <fan.ni@...sung.com>
> Reviewed-by: Nico Pache <npache@...hat.com>
> Reviewed-by: Davidlohr Bueso <dave@...olabs.net>
> Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> ---
> v2:
> Picked up Reviewed-by tags;
> v1:
> https://lore.kernel.org/linux-mm/CAA1CXcB06JD9Fp4c7GGU3NHEm4W-aV7TS7JW7eWxshJEM4t2_w@mail.gmail.com/T/
> ---

Reviewed-by: Yang Shi <yang@...amperecomputing.com>

>   include/trace/events/huge_memory.h | 6 +++---
>   mm/khugepaged.c                    | 4 ++--
>   2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
> index 9d5c00b0285c..a73699f000de 100644
> --- a/include/trace/events/huge_memory.h
> +++ b/include/trace/events/huge_memory.h
> @@ -116,10 +116,10 @@ TRACE_EVENT(mm_collapse_huge_page,
>   
>   TRACE_EVENT(mm_collapse_huge_page_isolate,
>   
> -	TP_PROTO(struct page *page, int none_or_zero,
> +	TP_PROTO(struct folio *folio, int none_or_zero,
>   		 int referenced, bool  writable, int status),
>   
> -	TP_ARGS(page, none_or_zero, referenced, writable, status),
> +	TP_ARGS(folio, none_or_zero, referenced, writable, status),
>   
>   	TP_STRUCT__entry(
>   		__field(unsigned long, pfn)
> @@ -130,7 +130,7 @@ TRACE_EVENT(mm_collapse_huge_page_isolate,
>   	),
>   
>   	TP_fast_assign(
> -		__entry->pfn = page ? page_to_pfn(page) : -1;
> +		__entry->pfn = folio ? folio_pfn(folio) : -1;
>   		__entry->none_or_zero = none_or_zero;
>   		__entry->referenced = referenced;
>   		__entry->writable = writable;
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index b8838ba8207a..950d147cd95e 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -696,13 +696,13 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma,
>   		result = SCAN_LACK_REFERENCED_PAGE;
>   	} else {
>   		result = SCAN_SUCCEED;
> -		trace_mm_collapse_huge_page_isolate(&folio->page, none_or_zero,
> +		trace_mm_collapse_huge_page_isolate(folio, none_or_zero,
>   						    referenced, writable, result);
>   		return result;
>   	}
>   out:
>   	release_pte_pages(pte, _pte, compound_pagelist);
> -	trace_mm_collapse_huge_page_isolate(&folio->page, none_or_zero,
> +	trace_mm_collapse_huge_page_isolate(folio, none_or_zero,
>   					    referenced, writable, result);
>   	return result;
>   }