mm, tracing: improve rss_stat tracepoint message

Adjust the rss_stat tracepoint to print the name of the resident page type
that got updated (e.g. MM_ANONPAGES/MM_FILEPAGES), rather than the numeric
index corresponding to it (the __entry->member value):

Before this patch:
------------------
  rss_stat: mm_id=1216113068 curr=0 member=1 size=28672B
  rss_stat: mm_id=1216113068 curr=0 member=1 size=0B
  rss_stat: mm_id=534402304 curr=1 member=0 size=188416B
  rss_stat: mm_id=534402304 curr=1 member=1 size=40960B

After this patch:
-----------------
  rss_stat: mm_id=1726253524 curr=1 type=MM_ANONPAGES size=40960B
  rss_stat: mm_id=1726253524 curr=1 type=MM_FILEPAGES size=663552B
  rss_stat: mm_id=1726253524 curr=1 type=MM_ANONPAGES size=65536B
  rss_stat: mm_id=1726253524 curr=1 type=MM_FILEPAGES size=647168B

Use TRACE_DEFINE_ENUM()/__print_symbolic() logic to map the enum values to
the strings they represent, so that userspace tools can also parse the raw
data correctly.

Link: https://lkml.kernel.org/r/20210310162305.4862-1-ovidiu.panait@windriver.com
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
Suggested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index 3a60b6b..829a756 100644 (file)
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -343,6 +343,26 @@ static unsigned int __maybe_unused mm_ptr_to_hash(const void *ptr)
 #define __PTR_TO_HASHVAL
 #endif
 
+#define TRACE_MM_PAGES         \
+       EM(MM_FILEPAGES)        \
+       EM(MM_ANONPAGES)        \
+       EM(MM_SWAPENTS)         \
+       EMe(MM_SHMEMPAGES)
+
+#undef EM
+#undef EMe
+
+#define EM(a)  TRACE_DEFINE_ENUM(a);
+#define EMe(a) TRACE_DEFINE_ENUM(a);
+
+TRACE_MM_PAGES
+
+#undef EM
+#undef EMe
+
+#define EM(a)  { a, #a },
+#define EMe(a) { a, #a }
+
 TRACE_EVENT(rss_stat,
 
        TP_PROTO(struct mm_struct *mm,
@@ -365,10 +385,10 @@ TRACE_EVENT(rss_stat,
                __entry->size = (count << PAGE_SHIFT);
        ),
 
-       TP_printk("mm_id=%u curr=%d member=%d size=%ldB",
+       TP_printk("mm_id=%u curr=%d type=%s size=%ldB",
                __entry->mm_id,
                __entry->curr,
-               __entry->member,
+               __print_symbolic(__entry->member, TRACE_MM_PAGES),
                __entry->size)
        );
 #endif /* _TRACE_KMEM_H */