shrink struct dentry

struct dentry is one of the most critical structures in the kernel. So it's
sad to see it going neglected.

With CONFIG_PROFILING turned on (which is probably the common case at least
for distros and kernel developers), sizeof(struct dcache) == 208 here
(64-bit). This gives 19 objects per slab.

I packed d_mounted into a hole, and took another 4 bytes off the inline
name length to take the padding out from the end of the structure. This
shinks it to 200 bytes. I could have gone the other way and increased the
length to 40, but I'm aiming for a magic number, read on...

I then got rid of the d_cookie pointer. This shrinks it to 192 bytes. Rant:
why was this ever a good idea? The cookie system should increase its hash
size or use a tree or something if lookups are a problem. Also the "fast
dcookie lookups" in oprofile should be moved into the dcookie code -- how
can oprofile possibly care about the dcookie_mutex? It gets dropped after
get_dcookie() returns so it can't be providing any sort of protection.

At 192 bytes, 21 objects fit into a 4K page, saving about 3MB on my system
with ~140 000 entries allocated. 192 is also a multiple of 64, so we get
nice cacheline alignment on 64 and 32 byte line systems -- any given dentry
will now require 3 cachelines to touch all fields wheras previously it
would require 4.

I know the inline name size was chosen quite carefully, however with the
reduction in cacheline footprint, it should actually be just about as fast
to do a name lookup for a 36 character name as it was before the patch (and
faster for other sizes). The memory footprint savings for names which are
<= 32 or > 36 bytes long should more than make up for the memory cost for
33-36 byte names.

Performance is a feature...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

5 files changed, 35 insertions, 22 deletions

diff --git a/arch/powerpc/oprofile/cell/spu_task_sync.c b/arch/powerpc/oprofile/cell/spu_task_sync.c
index 2949126d28d1..6b793aeda72e 100644
--- a/arch/powerpc/oprofile/cell/spu_task_sync.c
+++ b/arch/powerpc/oprofile/cell/spu_task_sync.c
@@ -297,7 +297,7 @@ static inline unsigned long fast_get_dcookie(struct path *path)
 {
         unsigned long cookie;
 
-        if (path->dentry->d_cookie)
+        if (path->dentry->d_flags & DCACHE_COOKIE)
                 return (unsigned long)path->dentry;
         get_dcookie(path, &cookie);
         return cookie;
diff --git a/drivers/oprofile/buffer_sync.c b/drivers/oprofile/buffer_sync.c
index 737bd9484822..65e8294a9e29 100644
--- a/drivers/oprofile/buffer_sync.c
+++ b/drivers/oprofile/buffer_sync.c
@@ -200,7 +200,7 @@ static inline unsigned long fast_get_dcookie(struct path *path)
 {
         unsigned long cookie;
 
-        if (path->dentry->d_cookie)
+        if (path->dentry->d_flags & DCACHE_COOKIE)
                 return (unsigned long)path->dentry;
         get_dcookie(path, &cookie);
         return cookie;
diff --git a/fs/dcache.c b/fs/dcache.c
index a1d86c7f3e66..fd244c7a7cc0 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -34,7 +34,6 @@
 #include <linux/bootmem.h>
 #include "internal.h"
 
-
 int sysctl_vfs_cache_pressure __read_mostly = 100;
 EXPORT_SYMBOL_GPL(sysctl_vfs_cache_pressure);
 
@@ -948,9 +947,6 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
         dentry->d_op = NULL;
         dentry->d_fsdata = NULL;
         dentry->d_mounted = 0;
-#ifdef CONFIG_PROFILING
-        dentry->d_cookie = NULL;
-#endif
         INIT_HLIST_NODE(&dentry->d_hash);
         INIT_LIST_HEAD(&dentry->d_lru);
         INIT_LIST_HEAD(&dentry->d_subdirs);
diff --git a/fs/dcookies.c b/fs/dcookies.c
index 855d4b1d619a..180e9fec4ad8 100644
--- a/fs/dcookies.c
+++ b/fs/dcookies.c
@@ -93,10 +93,15 @@ static struct dcookie_struct *alloc_dcookie(struct path *path)
 {
         struct dcookie_struct *dcs = kmem_cache_alloc(dcookie_cache,
                                                         GFP_KERNEL);
+        struct dentry *d;
         if (!dcs)
                 return NULL;
 
-        path->dentry->d_cookie = dcs;
+        d = path->dentry;
+        spin_lock(&d->d_lock);
+        d->d_flags |= DCACHE_COOKIE;
+        spin_unlock(&d->d_lock);
+
         dcs->path = *path;
         path_get(path);
         hash_dcookie(dcs);
@@ -119,14 +124,14 @@ int get_dcookie(struct path *path, unsigned long *cookie)
                 goto out;
         }
 
-        dcs = path->dentry->d_cookie;
-
-        if (!dcs)
+        if (path->dentry->d_flags & DCACHE_COOKIE) {
+                dcs = find_dcookie((unsigned long)path->dentry);
+        } else {
                 dcs = alloc_dcookie(path);
-
-        if (!dcs) {
-                err = -ENOMEM;
-                goto out;
+                if (!dcs) {
+                        err = -ENOMEM;
+                        goto out;
+                }
         }
 
         *cookie = dcookie_value(dcs);
@@ -251,7 +256,12 @@ out_kmem:
 
 static void free_dcookie(struct dcookie_struct * dcs)
 {
-        dcs->path.dentry->d_cookie = NULL;
+        struct dentry *d = dcs->path.dentry;
+
+        spin_lock(&d->d_lock);
+        d->d_flags &= ~DCACHE_COOKIE;
+        spin_unlock(&d->d_lock);
+
         path_put(&dcs->path);
         kmem_cache_free(dcookie_cache, dcs);
 }
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index a37359d0bad1..c66d22487bf8 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -75,14 +75,22 @@ full_name_hash(const unsigned char *name, unsigned int len)
         return end_name_hash(hash);
 }
 
-struct dcookie_struct;
-
-#define DNAME_INLINE_LEN_MIN 36
+/*
+ * Try to keep struct dentry aligned on 64 byte cachelines (this will
+ * give reasonable cacheline footprint with larger lines without the
+ * large memory footprint increase).
+ */
+#ifdef CONFIG_64BIT
+#define DNAME_INLINE_LEN_MIN 32 /* 192 bytes */
+#else
+#define DNAME_INLINE_LEN_MIN 40 /* 128 bytes */
+#endif
 
 struct dentry {
         atomic_t d_count;
         unsigned int d_flags;           /* protected by d_lock */
         spinlock_t d_lock;              /* per dentry lock */
+        int d_mounted;
         struct inode *d_inode;          /* Where the name belongs to - NULL is
                                          * negative */
         /*
@@ -107,10 +115,7 @@ struct dentry {
         struct dentry_operations *d_op;
         struct super_block *d_sb;       /* The root of the dentry tree */
         void *d_fsdata;                 /* fs-specific data */
-#ifdef CONFIG_PROFILING
-        struct dcookie_struct *d_cookie; /* cookie, if any */
-#endif
-        int d_mounted;
+
         unsigned char d_iname[DNAME_INLINE_LEN_MIN];    /* small names */
 };
 
@@ -177,6 +182,8 @@ d_iput:		no		no		no       yes
 
 #define DCACHE_INOTIFY_PARENT_WATCHED   0x0020 /* Parent inode is watched */
 
+#define DCACHE_COOKIE           0x0040  /* For use by dcookie subsystem */
+
 extern spinlock_t dcache_lock;
 extern seqlock_t rename_lock;