linux-kernel - [PATCH 2/2] Add mremap trace point

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Date:	Thu,  2 Sep 2010 14:59:45 +0100
From:	Eric B Munson <emunson@...bm.net>
To:	akpm@...ux-foundation.org
Cc:	mingo@...hat.com, hugh.dickins@...cali.co.uk, riel@...hat.com,
	peterz@...radead.org, anton@...ba.org, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	kosaki.motohiro@...fujitsu.com, Eric B Munson <emunson@...bm.net>
Subject: [PATCH 2/2] Add mremap trace point

This patch adds the trace point for mremap which reports relevant addresses
and sizes when mremap exits successfully.

Signed-off-by: Eric B Munson <emunson@...bm.net>
---
 include/trace/events/mm.h |   22 ++++++++++++++++++++++
 mm/mremap.c               |    4 ++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/include/trace/events/mm.h b/include/trace/events/mm.h
index 892bbe3..16f8c36 100644
--- a/include/trace/events/mm.h
+++ b/include/trace/events/mm.h
@@ -69,6 +69,28 @@ TRACE_EVENT(
 		TP_printk("%u bytes at 0x%lx\n", __entry->len, __entry->start)
 );
 
+TRACE_EVENT(
+		mremap,
+		TP_PROTO(unsigned long addr, unsigned long old_len,
+			 unsigned long new_addr, unsigned long new_len),
+		TP_ARGS(addr, old_len, new_addr, new_len),
+		TP_STRUCT__entry(
+			__field(unsigned long, addr)
+			__field(unsigned long, old_len)
+			__field(unsigned long, new_addr)
+			__field(unsigned long, new_len)
+		),
+		TP_fast_assign(
+			__entry->addr = addr;
+			__entry->old_len = old_len;
+			__entry->new_addr = new_addr;
+			__entry->new_len = new_len;
+		),
+		TP_printk("%lu bytes from 0x%lx to %lu bytes at 0x%lx\n",
+			__entry->old_len, __entry->addr, __entry->new_len,
+			__entry->new_addr)
+);
+
 #endif /* _TRACE_MM_H */
 
 #include <trace/define_trace.h>
diff --git a/mm/mremap.c b/mm/mremap.c
index cde56ee..4ef1dd3 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -20,6 +20,8 @@
 #include <linux/syscalls.h>
 #include <linux/mmu_notifier.h>
 
+#include <trace/events/mm.h>
+
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>
@@ -504,6 +506,8 @@ unsigned long do_mremap(unsigned long addr,
 out:
 	if (ret & ~PAGE_MASK)
 		vm_unacct_memory(charged);
+	else
+		trace_mremap(addr, old_len, new_addr, new_len);
 	return ret;
 }
 
-- 
1.7.0.4

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