gfs2: Replace gl_revokes with a GLF flag
The gl_revokes value determines how many outstanding revokes a glock has on the superblock revokes list; this is used to avoid unnecessary log flushes. However, gl_revokes is only ever tested for being zero, and it's only decremented in revoke_lo_after_commit, which removes all revokes from the list, so we know that the gl_revoke values of all the glocks on the list will reach zero. Therefore, we can replace gl_revokes with a bit flag. This saves an atomic counter in struct gfs2_glock. Signed-off-by: Bob Peterson <rpeterso@redhat.com> Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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@ -140,7 +140,7 @@ void gfs2_glock_free(struct gfs2_glock *gl)
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{
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struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
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BUG_ON(atomic_read(&gl->gl_revokes));
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BUG_ON(test_bit(GLF_REVOKES, &gl->gl_flags));
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rhashtable_remove_fast(&gl_hash_table, &gl->gl_node, ht_parms);
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smp_mb();
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wake_up_glock(gl);
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@ -1801,7 +1801,7 @@ void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl)
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state2str(gl->gl_target),
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state2str(gl->gl_demote_state), dtime,
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atomic_read(&gl->gl_ail_count),
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atomic_read(&gl->gl_revokes),
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test_bit(GLF_REVOKES, &gl->gl_flags) ? 1 : 0,
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(int)gl->gl_lockref.count, gl->gl_hold_time);
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list_for_each_entry(gh, &gl->gl_holders, gh_list)
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@ -345,6 +345,7 @@ enum {
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GLF_OBJECT = 14, /* Used only for tracing */
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GLF_BLOCKING = 15,
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GLF_INODE_CREATING = 16, /* Inode creation occurring */
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GLF_REVOKES = 17, /* Glock has revokes in queue */
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};
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struct gfs2_glock {
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@ -374,7 +375,6 @@ struct gfs2_glock {
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struct list_head gl_lru;
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struct list_head gl_ail_list;
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atomic_t gl_ail_count;
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atomic_t gl_revokes;
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struct delayed_work gl_work;
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union {
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/* For inode and iopen glocks only */
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@ -606,8 +606,10 @@ void gfs2_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
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gfs2_remove_from_ail(bd); /* drops ref on bh */
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bd->bd_bh = NULL;
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sdp->sd_log_num_revoke++;
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if (atomic_inc_return(&gl->gl_revokes) == 1)
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if (!test_bit(GLF_REVOKES, &gl->gl_flags)) {
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set_bit(GLF_REVOKES, &gl->gl_flags);
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gfs2_glock_hold(gl);
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}
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set_bit(GLF_LFLUSH, &gl->gl_flags);
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list_add(&bd->bd_list, &sdp->sd_log_le_revoke);
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}
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@ -662,19 +662,34 @@ static void revoke_lo_before_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
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static void revoke_lo_after_commit(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
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{
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struct list_head *head = &sdp->sd_log_le_revoke;
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struct gfs2_bufdata *bd;
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struct gfs2_glock *gl;
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struct gfs2_bufdata *bd, *tmp;
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while (!list_empty(head)) {
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bd = list_entry(head->next, struct gfs2_bufdata, bd_list);
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list_del_init(&bd->bd_list);
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gl = bd->bd_gl;
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if (atomic_dec_return(&gl->gl_revokes) == 0) {
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clear_bit(GLF_LFLUSH, &gl->gl_flags);
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gfs2_glock_queue_put(gl);
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/*
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* Glocks can be referenced repeatedly on the revoke list, but the list
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* only holds one reference. All glocks on the list will have the
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* GLF_REVOKES flag set initially.
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*/
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list_for_each_entry_safe(bd, tmp, head, bd_list) {
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struct gfs2_glock *gl = bd->bd_gl;
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if (test_bit(GLF_REVOKES, &gl->gl_flags)) {
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/* Keep each glock on the list exactly once. */
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clear_bit(GLF_REVOKES, &gl->gl_flags);
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continue;
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}
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list_del(&bd->bd_list);
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kmem_cache_free(gfs2_bufdata_cachep, bd);
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}
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list_for_each_entry_safe(bd, tmp, head, bd_list) {
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struct gfs2_glock *gl = bd->bd_gl;
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list_del(&bd->bd_list);
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kmem_cache_free(gfs2_bufdata_cachep, bd);
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clear_bit(GLF_LFLUSH, &gl->gl_flags);
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gfs2_glock_queue_put(gl);
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}
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/* the list is empty now */
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}
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static void revoke_lo_before_scan(struct gfs2_jdesc *jd,
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@ -59,7 +59,6 @@ static void gfs2_init_glock_once(void *foo)
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INIT_LIST_HEAD(&gl->gl_lru);
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INIT_LIST_HEAD(&gl->gl_ail_list);
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atomic_set(&gl->gl_ail_count, 0);
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atomic_set(&gl->gl_revokes, 0);
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}
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static void gfs2_init_gl_aspace_once(void *foo)
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@ -1474,7 +1474,7 @@ static void gfs2_final_release_pages(struct gfs2_inode *ip)
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truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
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truncate_inode_pages(&inode->i_data, 0);
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if (atomic_read(&gl->gl_revokes) == 0) {
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if (!test_bit(GLF_REVOKES, &gl->gl_flags)) {
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clear_bit(GLF_LFLUSH, &gl->gl_flags);
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clear_bit(GLF_DIRTY, &gl->gl_flags);
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}
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