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Commit 29d38cd1 authored by Bob Peterson's avatar Bob Peterson Committed by Steven Whitehouse
Browse files

[GFS2] Get rid of gl_waiters2 



This patch reduces memory by replacing the int variable
gl_waiters2 by a single bit in the gl_flags.

Signed-off-by: default avatarBob Peterson <rpeterso@redhat.com>
Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent 42d52e38

fs/gfs2/glock.c

+4 −3
Original line number Diff line number Diff line
@@ -595,11 +595,12 @@ static void run_queue(struct gfs2_glock *gl) 
			blocked = rq_mutex(gh);

		} else if (test_bit(GLF_DEMOTE, &gl->gl_flags)) {

			blocked = rq_demote(gl);

			if (gl->gl_waiters2 && !blocked) {

			if (test_bit(GLF_WAITERS2, &gl->gl_flags) &&

				     !blocked) {

				set_bit(GLF_DEMOTE, &gl->gl_flags);

				gl->gl_demote_state = LM_ST_UNLOCKED;

			}

			gl->gl_waiters2 = 0;

			clear_bit(GLF_WAITERS2, &gl->gl_flags);

		} else if (!list_empty(&gl->gl_waiters3)) {

			gh = list_entry(gl->gl_waiters3.next,

					struct gfs2_holder, gh_list);
@@ -710,7 +711,7 @@ static void handle_callback(struct gfs2_glock *gl, unsigned int state, 
	} else if (gl->gl_demote_state != LM_ST_UNLOCKED &&

			gl->gl_demote_state != state) {

		if (test_bit(GLF_DEMOTE_IN_PROGRESS,  &gl->gl_flags)) 

			gl->gl_waiters2 = 1;

			set_bit(GLF_WAITERS2, &gl->gl_flags);

		else 

			gl->gl_demote_state = LM_ST_UNLOCKED;

	}

fs/gfs2/incore.h

+2 −2
Original line number Diff line number Diff line 
/*

 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.

 * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.

 * Copyright (C) 2004-2008 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
@@ -167,6 +167,7 @@ enum { 
	GLF_DIRTY		= 5,

	GLF_DEMOTE_IN_PROGRESS	= 6,

	GLF_LFLUSH		= 7,

	GLF_WAITERS2		= 8,

};



struct gfs2_glock {
@@ -186,7 +187,6 @@ struct gfs2_glock { 
	struct list_head gl_holders;

	struct list_head gl_waiters1;	/* HIF_MUTEX */

	struct list_head gl_waiters3;	/* HIF_PROMOTE */

	int gl_waiters2;		/* GIF_DEMOTE */



	const struct gfs2_glock_operations *gl_ops;