Eric,
Would the following accomplish the same thing as your patch, to shrink
UP dentry structs back to 128 bytes, with a smaller and less intrusive
patch?
---
include/linux/dcache.h | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)
--- 2.6.15-rc2-mm1.orig/include/linux/dcache.h 2005-11-29 17:45:51.977352268 -0800
+++ 2.6.15-rc2-mm1/include/linux/dcache.h 2005-11-29 18:04:59.151307979 -0800
@@ -95,19 +95,24 @@ struct dentry {
struct qstr d_name;
struct list_head d_lru; /* LRU list */
- struct list_head d_child; /* child of parent list */
+ union { /* Fit 32 bit UP dentry in 128 bytes */
+ struct list_head du_child; /* child of parent list */
+ struct rcu_head du_rcu;
+ } d_du;
struct list_head d_subdirs; /* our children */
struct list_head d_alias; /* inode alias list */
unsigned long d_time; /* used by d_revalidate */
struct dentry_operations *d_op;
struct super_block *d_sb; /* The root of the dentry tree */
void *d_fsdata; /* fs-specific data */
- struct rcu_head d_rcu;
struct dcookie_struct *d_cookie; /* cookie, if any */
int d_mounted;
unsigned char d_iname[DNAME_INLINE_LEN_MIN]; /* small names */
};
+#define d_child d_du.du_child
+#define d_rcu d_du.du_rcu
+
struct dentry_operations {
int (*d_revalidate)(struct dentry *, struct nameidata *);
int (*d_hash) (struct dentry *, struct qstr *);
--
I won't rest till it's the best ...
Programmer, Linux Scalability
Paul Jackson <[email protected]> 1.925.600.0401
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