linux-kernel - [PATCH 1/2] Add trace points to mmap, munmap, and brk

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Message-Id: <f6a595dfac141397dcac8c29475be73d10f5248c.1279558781.git.emunson@mgebm.net>
Date:	Mon, 19 Jul 2010 18:06:33 +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,
	Eric B Munson <emunson@...bm.net>
Subject: [PATCH 1/2] Add trace points to mmap, munmap, and brk

This patch adds trace points to mmap, munmap, and brk that will report
relevant addresses and sizes before each function exits successfully.

Signed-off-by: Eric B Munson <emunson@...bm.net>
---
 include/trace/events/mm.h |   75 +++++++++++++++++++++++++++++++++++++++++++++
 mm/mmap.c                 |   15 ++++++++-
 2 files changed, 89 insertions(+), 1 deletions(-)
 create mode 100644 include/trace/events/mm.h

diff --git a/include/trace/events/mm.h b/include/trace/events/mm.h
new file mode 100644
index 0000000..892bbe3
--- /dev/null
+++ b/include/trace/events/mm.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2010, Eric Munson
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM mm
+
+#if !defined(_TRACE_MM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_MM_H
+
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(
+		mm_mmap_class,
+		TP_PROTO(unsigned long addr, unsigned long len),
+		TP_ARGS(addr, len),
+		TP_STRUCT__entry(
+			__field(unsigned long, addr)
+			__field(unsigned long, len)
+		),
+		TP_fast_assign(
+			__entry->addr = addr;
+			__entry->len = len;
+		),
+		TP_printk("%lu bytes at 0x%lx\n", __entry->len, __entry->addr)
+);
+
+DEFINE_EVENT(
+		mm_mmap_class,
+		mmap,
+		TP_PROTO(unsigned long addr, unsigned long len),
+		TP_ARGS(addr, len)
+);
+
+
+DEFINE_EVENT(
+		mm_mmap_class,
+		brk,
+		TP_PROTO(unsigned long addr, unsigned long len),
+		TP_ARGS(addr, len)
+);
+
+TRACE_EVENT(
+		munmap,
+		TP_PROTO(unsigned long start, size_t len),
+		TP_ARGS(start, len),
+		TP_STRUCT__entry(
+			__field(unsigned long, start)
+			__field(size_t, len)
+		),
+		TP_fast_assign(
+			__entry->start = start;
+			__entry->len = len;
+		),
+
+		TP_printk("%u bytes at 0x%lx\n", __entry->len, __entry->start)
+);
+
+#endif /* _TRACE_MM_H */
+
+#include <trace/define_trace.h>
+
diff --git a/mm/mmap.c b/mm/mmap.c
index 456ec6f..430ce46 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -29,6 +29,9 @@
 #include <linux/mmu_notifier.h>
 #include <linux/perf_event.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/mm.h>
+
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
 #include <asm/tlb.h>
@@ -949,6 +952,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
 	unsigned int vm_flags;
 	int error;
 	unsigned long reqprot = prot;
+	unsigned long ret;
 
 	/*
 	 * Does the application expect PROT_READ to imply PROT_EXEC?
@@ -1074,7 +1078,12 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr,
 	if (error)
 		return error;
 
-	return mmap_region(file, addr, len, flags, vm_flags, pgoff);
+	ret = mmap_region(file, addr, len, flags, vm_flags, pgoff);
+
+	if(!(ret & ~PAGE_MASK))
+		trace_mmap(addr,len);
+
+	return ret;
 }
 EXPORT_SYMBOL(do_mmap_pgoff);
 
@@ -2079,6 +2088,8 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 		}
 	}
 
+	trace_munmap(start, len);
+
 	/*
 	 * Remove the vma's, and unmap the actual pages
 	 */
@@ -2213,6 +2224,8 @@ out:
 		if (!mlock_vma_pages_range(vma, addr, addr + len))
 			mm->locked_vm += (len >> PAGE_SHIFT);
 	}
+
+	trace_brk(addr, len);
 	return addr;
 }
 
-- 
1.7.0.4

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