From c009cdac4bfc2ef741e6ac3324f766fd9e6e3f29 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@suse.de>
Date: Fri, 18 Nov 2005 11:01:35 +0100
Subject: [PATCH] [PATCH] fio: for mmap'ed io with the direct option, sync
 after each copy

---
 fio.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fio.c b/fio.c
index baf50f4..c46b5ac 100644
--- a/fio.c
+++ b/fio.c
@@ -700,6 +700,14 @@ static int __do_sync_mmap(struct thread_data *td, struct io_u *io_u)
 		memcpy(io_u->buf, td->mmap + real_off, io_u->buflen);
 	else
 		memcpy(td->mmap + real_off, io_u->buf, io_u->buflen);
+	
+	/*
+	 * not really direct, but should drop the pages from the cache
+	 */
+	if (td->odirect) {
+		msync(td->mmap + real_off, io_u->buflen, MS_SYNC);
+		madvise(td->mmap + real_off, io_u->buflen,  MADV_DONTNEED);
+	}
 
 	return io_u->buflen;
 }
-- 
2.25.1