From 73d9a51835f7f9b725b4bec851dac9d6482438e7 Mon Sep 17 00:00:00 2001
From: Joel Hestness <hestness@cs.utexas.edu>
Date: Thu, 12 Aug 2010 17:16:04 -0700
Subject: util/m5/m5.c: ensure readfile() buffer pages are in page table (and
marked dirty, in case that matters) by touching them beforehand
---
util/m5/m5.c | 5 +++++
1 file changed, 5 insertions(+)
(limited to 'util/m5/m5.c')
diff --git a/util/m5/m5.c b/util/m5/m5.c
index 7747fc0bc..96150f2bb 100644
--- a/util/m5/m5.c
+++ b/util/m5/m5.c
@@ -65,6 +65,11 @@ read_file(int dest_fid)
int offset = 0;
int len;
+ // Touch all buffer pages to ensure they are mapped in the
+ // page table. This is required in the case of X86_FS, where
+ // Linux does demand paging.
+ memset(buf, 0, sizeof(buf));
+
while ((len = m5_readfile(buf, sizeof(buf), offset)) > 0) {
write(dest_fid, buf, len);
offset += len;
--
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