From 5975d309ac40b9724f70b46bbfa3747e8dc24ea5 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@suse.de>
Date: Thu, 9 Feb 2006 08:34:51 +0100
Subject: [PATCH] [PATCH] Pin the mmap'ed output buffers in ram

---
 blktrace.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/blktrace.c b/blktrace.c
index 6e62d47..549f484 100644
--- a/blktrace.c
+++ b/blktrace.c
@@ -387,6 +387,7 @@ static int mmap_subbuf(struct thread_information *tip)
 	 */
 	if (tip->fs_off + buf_size > tip->fs_buf_len) {
 		if (tip->fs_buf) {
+			munlock(tip->fs_buf, tip->fs_buf_len);
 			munmap(tip->fs_buf, tip->fs_buf_len);
 			tip->fs_buf = NULL;
 		}
@@ -406,6 +407,7 @@ static int mmap_subbuf(struct thread_information *tip)
 			perror("mmap");
 			return -1;
 		}
+		mlock(tip->fs_buf, tip->fs_buf_len);
 	}
 
 	ret = read_data(tip, tip->fs_buf + tip->fs_off, buf_size);
-- 
2.25.1