linux-kernel - [PATCH V2 1/6] mm: compaction: trace compaction begin and end

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1386757477-10333-2-git-send-email-vbabka@suse.cz>
Date:	Wed, 11 Dec 2013 11:24:32 +0100
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Rik van Riel <riel@...hat.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH V2 1/6] mm: compaction: trace compaction begin and end

From: Mel Gorman <mgorman@...e.de>

This patch adds two tracepoints for compaction begin and end of a zone. Using
this it is possible to calculate how much time a workload is spending
within compaction and potentially debug problems related to cached pfns
for scanning. In combination with the direct reclaim and slab trace points
it should be possible to estimate most allocation-related overhead for
a workload.

Signed-off-by: Mel Gorman <mgorman@...e.de>
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 include/trace/events/compaction.h | 42 +++++++++++++++++++++++++++++++++++++++
 mm/compaction.c                   |  4 ++++
 2 files changed, 46 insertions(+)

diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h
index fde1b3e..06f544e 100644
--- a/include/trace/events/compaction.h
+++ b/include/trace/events/compaction.h
@@ -67,6 +67,48 @@ TRACE_EVENT(mm_compaction_migratepages,
 		__entry->nr_failed)
 );
 
+TRACE_EVENT(mm_compaction_begin,
+	TP_PROTO(unsigned long zone_start, unsigned long migrate_start,
+		unsigned long free_start, unsigned long zone_end),
+
+	TP_ARGS(zone_start, migrate_start, free_start, zone_end),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, zone_start)
+		__field(unsigned long, migrate_start)
+		__field(unsigned long, free_start)
+		__field(unsigned long, zone_end)
+	),
+
+	TP_fast_assign(
+		__entry->zone_start = zone_start;
+		__entry->migrate_start = migrate_start;
+		__entry->free_start = free_start;
+		__entry->zone_end = zone_end;
+	),
+
+	TP_printk("zone_start=%lu migrate_start=%lu free_start=%lu zone_end=%lu",
+		__entry->zone_start,
+		__entry->migrate_start,
+		__entry->free_start,
+		__entry->zone_end)
+);
+
+TRACE_EVENT(mm_compaction_end,
+	TP_PROTO(int status),
+
+	TP_ARGS(status),
+
+	TP_STRUCT__entry(
+		__field(int, status)
+	),
+
+	TP_fast_assign(
+		__entry->status = status;
+	),
+
+	TP_printk("status=%d", __entry->status)
+);
 
 #endif /* _TRACE_COMPACTION_H */
 
diff --git a/mm/compaction.c b/mm/compaction.c
index 805165b..bb50fd3 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -966,6 +966,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc)
 	if (compaction_restarting(zone, cc->order) && !current_is_kswapd())
 		__reset_isolation_suitable(zone);
 
+	trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn);
+
 	migrate_prep_local();
 
 	while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) {
@@ -1011,6 +1013,8 @@ out:
 	cc->nr_freepages -= release_freepages(&cc->freepages);
 	VM_BUG_ON(cc->nr_freepages != 0);
 
+	trace_mm_compaction_end(ret);
+
 	return ret;
 }
 
-- 
1.8.4

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/