mm/khugepaged: refactor mm_khugepaged_scan_file tracepoint to remove filename from...

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

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

Link: https://lkml.kernel.org/r/20221026044524.54793-1-gautammenghani201@gmail.com
Fixes: d41fd2016ed07 ("mm/khugepaged: add tracepoint to hpage_collapse_scan_file()")
Signed-off-by: Gautam Menghani <gautammenghani201@gmail.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Zach O'Keefe <zokeefe@google.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h
index 935af49..760455d 100644 (file)
--- 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 52b9cae..a8d5ef2 100644 (file)
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2153,8 +2153,7 @@ 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