vmscan: tracing: add trace event when a page is written

Add a trace event for when page reclaim queues a page for IO and records
whether it is synchronous or asynchronous.  Excessive synchronous IO for a
process can result in noticeable stalls during direct reclaim.  Excessive
IO from page reclaim may indicate that the system is seriously under
provisioned for the amount of dirty pages that exist.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Larry Woodman <lwoodman@redhat.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michael Rubin <mrubin@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index c0552be..69789dc 100644 (file)
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -8,6 +8,24 @@
 #include <linux/tracepoint.h>
 #include "gfpflags.h"
 
+#define RECLAIM_WB_ANON                0x0001u
+#define RECLAIM_WB_FILE                0x0002u
+#define RECLAIM_WB_SYNC                0x0004u
+#define RECLAIM_WB_ASYNC       0x0008u
+
+#define show_reclaim_flags(flags)                              \
+       (flags) ? __print_flags(flags, "|",                     \
+               {RECLAIM_WB_ANON,       "RECLAIM_WB_ANON"},     \
+               {RECLAIM_WB_FILE,       "RECLAIM_WB_FILE"},     \
+               {RECLAIM_WB_SYNC,       "RECLAIM_WB_SYNC"},     \
+               {RECLAIM_WB_ASYNC,      "RECLAIM_WB_ASYNC"}     \
+               ) : "RECLAIM_WB_NONE"
+
+#define trace_reclaim_flags(page, sync) ( \
+       (page_is_file_cache(page) ? RECLAIM_WB_FILE : RECLAIM_WB_ANON) | \
+       (sync == PAGEOUT_IO_SYNC ? RECLAIM_WB_SYNC : RECLAIM_WB_ASYNC)   \
+       )
+
 TRACE_EVENT(mm_vmscan_kswapd_sleep,
 
        TP_PROTO(int nid),
@@ -155,6 +173,29 @@ TRACE_EVENT(mm_vmscan_lru_isolate,
                __entry->nr_lumpy_failed)
 );
 
+TRACE_EVENT(mm_vmscan_writepage,
+
+       TP_PROTO(struct page *page,
+               int reclaim_flags),
+
+       TP_ARGS(page, reclaim_flags),
+
+       TP_STRUCT__entry(
+               __field(struct page *, page)
+               __field(int, reclaim_flags)
+       ),
+
+       TP_fast_assign(
+               __entry->page = page;
+               __entry->reclaim_flags = reclaim_flags;
+       ),
+
+       TP_printk("page=%p pfn=%lu flags=%s",
+               __entry->page,
+               page_to_pfn(__entry->page),
+               show_reclaim_flags(__entry->reclaim_flags))
+);
+
 #endif /* _TRACE_VMSCAN_H */
 
 /* This part must be outside protection */

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 3d006d9..b7a4e6a 100644 (file)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -401,6 +401,8 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
                        /* synchronous write or broken a_ops? */
                        ClearPageReclaim(page);
                }
+               trace_mm_vmscan_writepage(page,
+                       trace_reclaim_flags(page, sync_writeback));
                inc_zone_page_state(page, NR_VMSCAN_WRITE);
                return PAGE_SUCCESS;
        }