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| author | Eric Paris <eparis@redhat.com> | 2009-08-07 16:54:23 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-09-24 03:50:25 -0400 |
| commit | e08b061ec0fca1f63bb1006bf1edc0556f36d0ae (patch) | |
| tree | 71a286a55b7707f7bfdc759a7b1ab03e3f2a3755 /kernel/audit_watch.c | |
| parent | 94a8d5caba74211ec76dac80fc6e2d5c391530df (diff) | |
| download | lwn-e08b061ec0fca1f63bb1006bf1edc0556f36d0ae.tar.gz lwn-e08b061ec0fca1f63bb1006bf1edc0556f36d0ae.zip | |
Audit: reorganize struct audit_watch to save 8 bytes
pahole showed that struct audit_watch had two holes:
struct audit_watch {
atomic_t count; /* 0 4 */
/* XXX 4 bytes hole, try to pack */
char * path; /* 8 8 */
dev_t dev; /* 16 4 */
/* XXX 4 bytes hole, try to pack */
long unsigned int ino; /* 24 8 */
struct audit_parent * parent; /* 32 8 */
struct list_head wlist; /* 40 16 */
struct list_head rules; /* 56 16 */
/* --- cacheline 1 boundary (64 bytes) was 8 bytes ago --- */
/* size: 72, cachelines: 2, members: 7 */
/* sum members: 64, holes: 2, sum holes: 8 */
/* last cacheline: 8 bytes */
}; /* definitions: 1 */
by moving dev after count we save 8 bytes, actually improving cacheline
usage. There are typically very few of these in the kernel so it won't be
a large savings, but it's a good thing no matter what.
Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'kernel/audit_watch.c')
| -rw-r--r-- | kernel/audit_watch.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/audit_watch.c b/kernel/audit_watch.c index 0e96dbc60ea9..cc7e87936cbc 100644 --- a/kernel/audit_watch.c +++ b/kernel/audit_watch.c @@ -45,8 +45,8 @@ struct audit_watch { atomic_t count; /* reference count */ - char *path; /* insertion path */ dev_t dev; /* associated superblock device */ + char *path; /* insertion path */ unsigned long ino; /* associated inode number */ struct audit_parent *parent; /* associated parent */ struct list_head wlist; /* entry in parent->watches list */ |