[GFS2] Speed up lock_dlm's locking (move sprintf) [8/34]

Steven Whitehouse
2007-05-01T10:09:17Z

>From f35ac346bc48b2086aa94f031baf1f6237a89de6 Mon Sep 17 00:00:00 2001
From: Steven Whitehouse <swhiteho@redhat.com>
Date: Sun, 18 Mar 2007 17:04:15 +0000
Subject: [PATCH] [GFS2] Speed up lock_dlm's locking (move sprintf)

The following patch speeds up lock_dlm's locking by moving the sprintf
out from the lock acquisition path and into the lock creation path. This
reduces the amount of CPU time used in acquiring locks by a fair amount.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Acked-by: David Teigland <teigland@redhat.com>

diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c
index b167add..f9c8bda 100644
--- a/fs/gfs2/locking/dlm/lock.c
+++ b/fs/gfs2/locking/dlm/lock.c
@@ -151,7 +151,7 @@ static inline unsigned int make_flags(struct gdlm_lock *lp,

/* make_strname - convert GFS lock numbers to a string */

-static inline void make_strname(struct lm_lockname *lockname,
+static inline void make_strname(const struct lm_lockname *lockname,
struct gdlm_strname *str)
{
sprintf(str->name, "%8x%16llx", lockname->ln_type,
@@ -169,6 +169,7 @@ static int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name,
return -ENOMEM;

lp->lockname = *name;
+ make_strname(name, &lp->strname);
lp->ls = ls;
lp->cur = DLM_LOCK_IV;
lp->lvb = NULL;
@@ -227,7 +228,6 @@ void gdlm_put_lock(void *lock)
unsigned int gdlm_do_lock(struct gdlm_lock *lp)
{
struct gdlm_ls *ls = lp->ls;
- struct gdlm_strname str;
int error, bast = 1;

/*
@@ -249,8 +249,6 @@ unsigned int gdlm_do_lock(struct gdlm_lock *lp)
if (test_bit(LFL_NOBAST, &lp->flags))
bast = 0;

- make_strname(&lp->lockname, &str);
-
set_bit(LFL_ACTIVE, &lp->flags);

log_debug("lk %x,%llx id %x %d,%d %x", lp->lockname.ln_type,
@@ -258,8 +256,8 @@ unsigned int gdlm_do_lock(struct gdlm_lock *lp)
lp->cur, lp->req, lp->lkf);

error = dlm_lock(ls->dlm_lockspace, lp->req, &lp->lksb, lp->lkf,
- str.name, str.namelen, 0, gdlm_ast, lp,
- bast ? gdlm_bast : NULL);
+ lp->strname.name, lp->strname.namelen, 0, gdlm_ast,
+ lp, bast ? gdlm_bast : NULL);

if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) {
lp->lksb.sb_status = -EAGAIN;
diff --git a/fs/gfs2/locking/dlm/lock_dlm.h b/fs/gfs2/locking/dlm/lock_dlm.h
index a87c7bf..6888bd4 100644
--- a/fs/gfs2/locking/dlm/lock_dlm.h
+++ b/fs/gfs2/locking/dlm/lock_dlm.h
@@ -106,6 +106,7 @@ enum {
struct gdlm_lock {
struct gdlm_ls *ls;
struct lm_lockname lockname;
+ struct gdlm_strname strname;
char *lvb;
struct dlm_lksb lksb;

--
1.5.1.2