Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2dafe1c4d69345539735cca64250f2d4657bd057
Commit: 2dafe1c4d69345539735cca64250f2d4657bd057
Parent: ac2a659968f5318a180213f0409c2ea21f072820
Author: Eric Sandeen <[EMAIL PROTECTED]>
AuthorDate: Fri Feb 8 04:22:12 2008 -0800
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Feb 8 09:22:44 2008 -0800
reduce large do_mount stack usage with noinlines
do_mount() uses a whopping 616 bytes of stack on x86_64 in 2.6.24-mm1,
largely thanks to gcc inlining the various helper functions.
noinlining these can slim it down a lot; on my box this patch gets it down
to 168, which is mostly the struct nameidata nd; left on the stack.
These functions are called only as do_mount() helpers; none of them should
be in any path that would see a performance benefit from inlining...
Signed-off-by: Eric Sandeen <[EMAIL PROTECTED]>
Cc: Arjan van de Ven <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
fs/namespace.c | 18 +++++++++++++-----
1 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index db51ddc..63ced21 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -936,8 +936,9 @@ out_unlock:
/*
* recursively change the type of the mountpoint.
+ * noinline this do_mount helper to save do_mount stack space.
*/
-static int do_change_type(struct nameidata *nd, int flag)
+static noinline int do_change_type(struct nameidata *nd, int flag)
{
struct vfsmount *m, *mnt = nd->mnt;
int recurse = flag & MS_REC;
@@ -960,8 +961,10 @@ static int do_change_type(struct nameidata *nd, int flag)
/*
* do loopback mount.
+ * noinline this do_mount helper to save do_mount stack space.
*/
-static int do_loopback(struct nameidata *nd, char *old_name, int recurse)
+static noinline int do_loopback(struct nameidata *nd, char *old_name,
+ int recurse)
{
struct nameidata old_nd;
struct vfsmount *mnt = NULL;
@@ -1010,8 +1013,9 @@ out:
* change filesystem flags. dir should be a physical root of filesystem.
* If you've mounted a non-root directory somewhere and want to do remount
* on it - tough luck.
+ * noinline this do_mount helper to save do_mount stack space.
*/
-static int do_remount(struct nameidata *nd, int flags, int mnt_flags,
+static noinline int do_remount(struct nameidata *nd, int flags, int mnt_flags,
void *data)
{
int err;
@@ -1046,7 +1050,10 @@ static inline int tree_contains_unbindable(struct
vfsmount *mnt)
return 0;
}
-static int do_move_mount(struct nameidata *nd, char *old_name)
+/*
+ * noinline this do_mount helper to save do_mount stack space.
+ */
+static noinline int do_move_mount(struct nameidata *nd, char *old_name)
{
struct nameidata old_nd, parent_nd;
struct vfsmount *p;
@@ -1121,8 +1128,9 @@ out:
/*
* create a new mount for userspace and request it to be added into the
* namespace's tree
+ * noinline this do_mount helper to save do_mount stack space.
*/
-static int do_new_mount(struct nameidata *nd, char *type, int flags,
+static noinline int do_new_mount(struct nameidata *nd, char *type, int flags,
int mnt_flags, char *name, void *data)
{
struct vfsmount *mnt;
-
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