From 29687a2ac8dfcd5363e515ea715ec226aef8c26b Mon Sep 17 00:00:00 2001 From: Steven Whitehouse Date: Wed, 30 Mar 2011 16:33:25 +0100 Subject: GFS2: Alter point of entry to glock lru list for glocks with an address_space Rather than allowing the glocks to be scheduled for possible reclaim as soon as they have exited the journal, this patch delays their entry to the list until the glocks in question are no longer in use. This means that we will rely on the vm for writeback of all dirty data and metadata from now on. When glocks are added to the lru list they should be freeable much faster since all the I/O required to free them should have already been completed. This should lead to much better I/O patterns under low memory conditions. Signed-off-by: Steven Whitehouse --- fs/gfs2/glock.c | 33 +++++++++++++++------------------ fs/gfs2/glock.h | 3 +-- fs/gfs2/lops.c | 12 +++++------- fs/gfs2/rgrp.c | 1 + fs/gfs2/super.c | 1 + 5 files changed, 23 insertions(+), 27 deletions(-) (limited to 'fs/gfs2') diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index f07643e21bfa..1019183232fe 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -160,6 +160,19 @@ static int demote_ok(const struct gfs2_glock *gl) } +void gfs2_glock_add_to_lru(struct gfs2_glock *gl) +{ + spin_lock(&lru_lock); + + if (!list_empty(&gl->gl_lru)) + list_del_init(&gl->gl_lru); + else + atomic_inc(&lru_count); + + list_add_tail(&gl->gl_lru, &lru_list); + spin_unlock(&lru_lock); +} + /** * __gfs2_glock_schedule_for_reclaim - Add a glock to the reclaim list * @gl: the glock @@ -170,24 +183,8 @@ static int demote_ok(const struct gfs2_glock *gl) static void __gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) { - if (demote_ok(gl)) { - spin_lock(&lru_lock); - - if (!list_empty(&gl->gl_lru)) - list_del_init(&gl->gl_lru); - else - atomic_inc(&lru_count); - - list_add_tail(&gl->gl_lru, &lru_list); - spin_unlock(&lru_lock); - } -} - -void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl) -{ - spin_lock(&gl->gl_spin); - __gfs2_glock_schedule_for_reclaim(gl); - spin_unlock(&gl->gl_spin); + if (demote_ok(gl)) + gfs2_glock_add_to_lru(gl); } /** diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h index aea160690e94..6b2f757b9281 100644 --- a/fs/gfs2/glock.h +++ b/fs/gfs2/glock.h @@ -225,11 +225,10 @@ static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state); extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret); -extern void gfs2_reclaim_glock(struct gfs2_sbd *sdp); extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip); extern void gfs2_glock_thaw(struct gfs2_sbd *sdp); -extern void gfs2_glock_schedule_for_reclaim(struct gfs2_glock *gl); +extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl); extern void gfs2_glock_free(struct gfs2_glock *gl); extern int __init gfs2_glock_init(void); diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c index 51d27f00ebb4..611a51d476b2 100644 --- a/fs/gfs2/lops.c +++ b/fs/gfs2/lops.c @@ -40,7 +40,7 @@ static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) { struct gfs2_bufdata *bd; - gfs2_assert_withdraw(sdp, test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)); + BUG_ON(!current->journal_info); clear_buffer_dirty(bh); if (test_set_buffer_pinned(bh)) @@ -65,6 +65,7 @@ static void gfs2_pin(struct gfs2_sbd *sdp, struct buffer_head *bh) * @sdp: the filesystem the buffer belongs to * @bh: The buffer to unpin * @ai: + * @flags: The inode dirty flags * */ @@ -73,10 +74,8 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, { struct gfs2_bufdata *bd = bh->b_private; - gfs2_assert_withdraw(sdp, buffer_uptodate(bh)); - - if (!buffer_pinned(bh)) - gfs2_assert_withdraw(sdp, 0); + BUG_ON(!buffer_uptodate(bh)); + BUG_ON(!buffer_pinned(bh)); lock_buffer(bh); mark_buffer_dirty(bh); @@ -95,8 +94,7 @@ static void gfs2_unpin(struct gfs2_sbd *sdp, struct buffer_head *bh, list_add(&bd->bd_ail_st_list, &ai->ai_ail1_list); spin_unlock(&sdp->sd_ail_lock); - if (test_and_clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags)) - gfs2_glock_schedule_for_reclaim(bd->bd_gl); + clear_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags); trace_gfs2_pin(bd, 0); unlock_buffer(bh); atomic_dec(&sdp->sd_log_pinned); diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c index b643c14caff9..7273ad3c85ba 100644 --- a/fs/gfs2/rgrp.c +++ b/fs/gfs2/rgrp.c @@ -392,6 +392,7 @@ static void clear_rgrpdi(struct gfs2_sbd *sdp) if (gl) { gl->gl_object = NULL; + gfs2_glock_add_to_lru(gl); gfs2_glock_put(gl); } diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index d827b934cbd3..b62c8427672c 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -1401,6 +1401,7 @@ out: end_writeback(inode); ip->i_gl->gl_object = NULL; + gfs2_glock_add_to_lru(ip->i_gl); gfs2_glock_put(ip->i_gl); ip->i_gl = NULL; if (ip->i_iopen_gh.gh_gl) { -- cgit v1.2.3