linux-kernel - [PATCH v3 1/5] mm/compaction: change tracepoint format from decimal to hexadecimal

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Message-Id: <1421307673-24084-1-git-send-email-iamjoonsoo.kim@lge.com>
Date:	Thu, 15 Jan 2015 16:41:09 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v3 1/5] mm/compaction: change tracepoint format from decimal to hexadecimal

To check the range that compaction is working, tracepoint print
start/end pfn of zone and start pfn of both scanner with decimal format.
Since we manage all pages in order of 2 and it is well represented by
hexadecimal, this patch change the tracepoint format from decimal to
hexadecimal. This would improve readability. For example, it makes us
easily notice whether current scanner try to compact previously
attempted pageblock or not.

Acked-by: Vlastimil Babka <vbabka@...e.cz>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 include/trace/events/compaction.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index c6814b9..1337d9e 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -104,7 +104,7 @@ TRACE_EVENT(mm_compaction_begin,
 		__entry->zone_end = zone_end;
 	),
 
-	TP_printk("zone_start=%lu migrate_start=%lu free_start=%lu zone_end=%lu",
+	TP_printk("zone_start=0x%lx migrate_start=0x%lx free_start=0x%lx zone_end=0x%lx",
 		__entry->zone_start,
 		__entry->migrate_start,
 		__entry->free_start,
-- 
1.7.9.5

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