linux-kernel - [PATCH 2/8] vmscan: tracing: Update trace event to track if page reclaim IO is for anon or file pages

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Date:	Mon, 19 Jul 2010 14:11:24 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	linux-mm@...ck.org
Cc:	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Hellwig <hch@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Mel Gorman <mel@....ul.ie>
Subject: [PATCH 2/8] vmscan: tracing: Update trace event to track if page reclaim IO is for anon or file pages

It is useful to distinguish between IO for anon and file pages. This
patch updates
vmscan-tracing-add-trace-event-when-a-page-is-written.patch to include
that information. The patches can be merged together.

Signed-off-by: Mel Gorman <mel@....ul.ie>
---
 include/trace/events/vmscan.h |    8 ++++++--
 mm/vmscan.c                   |    1 +
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index f2da66a..110aea2 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -158,23 +158,27 @@ TRACE_EVENT(mm_vmscan_lru_isolate,
 TRACE_EVENT(mm_vmscan_writepage,
 
 	TP_PROTO(struct page *page,
+		int file,
 		int sync_io),
 
-	TP_ARGS(page, sync_io),
+	TP_ARGS(page, file, sync_io),
 
 	TP_STRUCT__entry(
 		__field(struct page *, page)
+		__field(int, file)
 		__field(int, sync_io)
 	),
 
 	TP_fast_assign(
 		__entry->page = page;
+		__entry->file = file;
 		__entry->sync_io = sync_io;
 	),
 
-	TP_printk("page=%p pfn=%lu sync_io=%d",
+	TP_printk("page=%p pfn=%lu file=%d sync_io=%d",
 		__entry->page,
 		page_to_pfn(__entry->page),
+		__entry->file,
 		__entry->sync_io)
 );
 
diff --git a/mm/vmscan.c b/mm/vmscan.c
index e6ddba9..6587155 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -400,6 +400,7 @@ static pageout_t pageout(struct page *page, struct address_space *mapping,
 			ClearPageReclaim(page);
 		}
 		trace_mm_vmscan_writepage(page,
+			page_is_file_cache(page),
 			sync_writeback == PAGEOUT_IO_SYNC);
 		inc_zone_page_state(page, NR_VMSCAN_WRITE);
 		return PAGE_SUCCESS;
-- 
1.7.1

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