linux-kernel - [PATCH 07/23] mm: trace filemap: dump page order

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Date:	Sun,  4 Aug 2013 05:17:09 +0300
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>, Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, Dave Hansen <dave@...1.net>,
	Ning Qu <quning@...gle.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 07/23] mm: trace filemap: dump page order

From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>

Dump page order to trace to be able to distinguish between small page
and huge page in page cache.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Acked-by: Dave Hansen <dave.hansen@...ux.intel.com>
---
 include/trace/events/filemap.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/filemap.h b/include/trace/events/filemap.h
index 0421f49..7e14b13 100644
--- a/include/trace/events/filemap.h
+++ b/include/trace/events/filemap.h
@@ -21,6 +21,7 @@ DECLARE_EVENT_CLASS(mm_filemap_op_page_cache,
 		__field(struct page *, page)
 		__field(unsigned long, i_ino)
 		__field(unsigned long, index)
+		__field(int, order)
 		__field(dev_t, s_dev)
 	),
 
@@ -28,18 +29,20 @@ DECLARE_EVENT_CLASS(mm_filemap_op_page_cache,
 		__entry->page = page;
 		__entry->i_ino = page->mapping->host->i_ino;
 		__entry->index = page->index;
+		__entry->order = compound_order(page);
 		if (page->mapping->host->i_sb)
 			__entry->s_dev = page->mapping->host->i_sb->s_dev;
 		else
 			__entry->s_dev = page->mapping->host->i_rdev;
 	),
 
-	TP_printk("dev %d:%d ino %lx page=%p pfn=%lu ofs=%lu",
+	TP_printk("dev %d:%d ino %lx page=%p pfn=%lu ofs=%lu order=%d",
 		MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
 		__entry->i_ino,
 		__entry->page,
 		page_to_pfn(__entry->page),
-		__entry->index << PAGE_SHIFT)
+		__entry->index << PAGE_SHIFT,
+		__entry->order)
 );
 
 DEFINE_EVENT(mm_filemap_op_page_cache, mm_filemap_delete_from_page_cache,
-- 
1.8.3.2

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