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[GFS2] Reorganize function gfs2_glmutex_lock

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This patch optimizes the function gfs2_glmutex_lock.
The basic theory is: Why bother initializing a holder, setting up
wait bits and then waiting on them, if you know the glock can be
yours.  So the holder stuff is placed inside the if checking if the
glock is locked.  This one needs careful scrutiny because changing
anything to do with locking should strike terror into one's heart.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2007-12-11 19:13:54 -06:00 committed by Steven Whitehouse
parent 5fdc2eeb5d
commit 398bbe6832
1 changed files with 9 additions and 14 deletions
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23
fs/gfs2/glock.c
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@ -1,6 +1,6 @@
/*
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
@ -620,26 +620,21 @@ static void run_queue(struct gfs2_glock *gl)
static void gfs2_glmutex_lock(struct gfs2_glock *gl)
{
struct gfs2_holder gh;
gfs2_holder_init(gl, 0, 0, &gh);
if (test_and_set_bit(HIF_WAIT, &gh.gh_iflags))
BUG();
spin_lock(&gl->gl_spin);
if (test_and_set_bit(GLF_LOCK, &gl->gl_flags)) {
struct gfs2_holder gh;
gfs2_holder_init(gl, 0, 0, &gh);
set_bit(HIF_WAIT, &gh.gh_iflags);
list_add_tail(&gh.gh_list, &gl->gl_waiters1);
spin_unlock(&gl->gl_spin);
wait_on_holder(&gh);
gfs2_holder_uninit(&gh);
} else {
gl->gl_owner_pid = current->pid;
gl->gl_ip = (unsigned long)__builtin_return_address(0);
clear_bit(HIF_WAIT, &gh.gh_iflags);
smp_mb();
wake_up_bit(&gh.gh_iflags, HIF_WAIT);
spin_unlock(&gl->gl_spin);
}
spin_unlock(&gl->gl_spin);
wait_on_holder(&gh);
gfs2_holder_uninit(&gh);
}
/**