Module Name: src
Committed By: pooka
Date: Thu Dec 17 14:06:38 UTC 2009
Modified Files:
src/usr.sbin/puffs/rump_tmpfs: rump_tmpfs.c
Log Message:
add ranty rant about data storage in tmpfs
To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c
diff -u src/usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c:1.3 src/usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c:1.4
--- src/usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c:1.3 Thu Sep 4 15:34:56 2008
+++ src/usr.sbin/puffs/rump_tmpfs/rump_tmpfs.c Thu Dec 17 14:06:38 2009
@@ -1,4 +1,4 @@
-/* $NetBSD: rump_tmpfs.c,v 1.3 2008/09/04 15:34:56 pooka Exp $ */
+/* $NetBSD: rump_tmpfs.c,v 1.4 2009/12/17 14:06:38 pooka Exp $ */
/*
* Copyright (c) 2008 Antti Kantee. All Rights Reserved.
@@ -39,6 +39,17 @@
#include "mount_tmpfs.h"
+/*
+ * tmpfs has a slight "issue" with file content storage. Since it
+ * stores data in memory, we will end up using 2x the RAM for
+ * storage if we cache in puffs vfs. If we don't, we need to take
+ * the slow path from the kernel to the file server every time the
+ * file is accessed. It's either suck or suck. However, rump_tmpfs
+ * will not be used in real life, so this is hardly a release-stopping
+ * issue of catastrophic proportions. For now we opt for un-double
+ * storage (PUFFS_KFLAG_NOCACHE_PAGE).
+ */
+
int
main(int argc, char *argv[])
{
