linux-kernel - [PATCH] mm/khugepaged: Refactor mm_khugepaged_scan_file tracepoint to remove filename from function call

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Message-Id: <20221026044524.54793-1-gautammenghani201@gmail.com>
Date:   Wed, 26 Oct 2022 10:15:24 +0530
From:   Gautam Menghani <gautammenghani201@...il.com>
To:     akpm@...ux-foundation.org, rostedt@...dmis.org,
        mhiramat@...nel.org, shy828301@...il.com, zokeefe@...gle.com,
        david@...hat.com
Cc:     Gautam Menghani <gautammenghani201@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm/khugepaged: Refactor mm_khugepaged_scan_file tracepoint to remove filename from function call

Refactor the mm_khugepaged_scan_file tracepoint to move filename
dereference to the tracepoint definition, for maintaing consistency with
other tracepoints[1].

[1]:lore.kernel.org/lkml/20221024111621.3ba17e2c@...dalf.local.home/

Signed-off-by: Gautam Menghani <gautammenghani201@...il.com>
---
 include/trace/events/huge_memory.h | 8 ++++----
 mm/khugepaged.c                    | 3 +--
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
index 935af4947917..760455dfa860 100644
--- a/include/trace/events/huge_memory.h
+++ b/include/trace/events/huge_memory.h
@@ -171,15 +171,15 @@ TRACE_EVENT(mm_collapse_huge_page_swapin,
 
 TRACE_EVENT(mm_khugepaged_scan_file,
 
-	TP_PROTO(struct mm_struct *mm, struct page *page, const char *filename,
+	TP_PROTO(struct mm_struct *mm, struct page *page, struct file *file,
 		 int present, int swap, int result),
 
-	TP_ARGS(mm, page, filename, present, swap, result),
+	TP_ARGS(mm, page, file, present, swap, result),
 
 	TP_STRUCT__entry(
 		__field(struct mm_struct *, mm)
 		__field(unsigned long, pfn)
-		__string(filename, filename)
+		__string(filename, file->f_path.dentry->d_iname)
 		__field(int, present)
 		__field(int, swap)
 		__field(int, result)
@@ -188,7 +188,7 @@ TRACE_EVENT(mm_khugepaged_scan_file,
 	TP_fast_assign(
 		__entry->mm = mm;
 		__entry->pfn = page ? page_to_pfn(page) : -1;
-		__assign_str(filename, filename);
+		__assign_str(filename, file->f_path.dentry->d_iname);
 		__entry->present = present;
 		__entry->swap = swap;
 		__entry->result = result;
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 4734315f7940..9808a899f9f7 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2157,8 +2157,7 @@ static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
 		}
 	}
 
-	trace_mm_khugepaged_scan_file(mm, page, file->f_path.dentry->d_iname,
-				      present, swap, result);
+	trace_mm_khugepaged_scan_file(mm, page, file, present, swap, result);
 	return result;
 }
 #else
-- 
2.34.1