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GFS2: Switch tr_touched to flag in transaction

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This patch eliminates the int variable tr_touched in favor of a
new flag in the transaction. This is a step toward reducing contention
on the gfs2_log_lock spin_lock.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2017-01-25 12:50:47 -05:00
parent b63f5e8482
commit 9862ca056e
4 changed files with 23 additions and 18 deletions
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10
fs/gfs2/incore.h
View File

@ -470,15 +470,19 @@ struct gfs2_quota_data {
struct rcu_head qd_rcu;
};
enum {
TR_TOUCHED = 1,
TR_ATTACHED = 2,
TR_ALLOCED = 3,
};
struct gfs2_trans {
unsigned long tr_ip;
unsigned int tr_blocks;
unsigned int tr_revokes;
unsigned int tr_reserved;
unsigned int tr_touched:1;
unsigned int tr_attached:1;
unsigned int tr_alloced:1;
unsigned long tr_flags;
unsigned int tr_num_buf_new;
unsigned int tr_num_databuf_new;

6
fs/gfs2/log.c
View File

@ -799,7 +799,7 @@ void gfs2_log_flush(struct gfs2_sbd *sdp, struct gfs2_glock *gl,
static void gfs2_merge_trans(struct gfs2_trans *old, struct gfs2_trans *new)
{
WARN_ON_ONCE(old->tr_attached != 1);
WARN_ON_ONCE(!test_bit(TR_ATTACHED, &old->tr_flags));
old->tr_num_buf_new += new->tr_num_buf_new;
old->tr_num_databuf_new += new->tr_num_databuf_new;
@ -823,9 +823,9 @@ static void log_refund(struct gfs2_sbd *sdp, struct gfs2_trans *tr)
if (sdp->sd_log_tr) {
gfs2_merge_trans(sdp->sd_log_tr, tr);
} else if (tr->tr_num_buf_new || tr->tr_num_databuf_new) {
gfs2_assert_withdraw(sdp, tr->tr_alloced);
gfs2_assert_withdraw(sdp, test_bit(TR_ALLOCED, &tr->tr_flags));
sdp->sd_log_tr = tr;
tr->tr_attached = 1;
set_bit(TR_ATTACHED, &tr->tr_flags);
}
sdp->sd_log_commited_revoke += tr->tr_num_revoke - tr->tr_num_revoke_rm;

6
fs/gfs2/meta_io.c
View File

@ -293,7 +293,7 @@ int gfs2_meta_read(struct gfs2_glock *gl, u64 blkno, int flags,
wait_on_buffer(bh);
if (unlikely(!buffer_uptodate(bh))) {
struct gfs2_trans *tr = current->journal_info;
if (tr && tr->tr_touched)
if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
gfs2_io_error_bh(sdp, bh);
brelse(bh);
*bhp = NULL;
@ -320,7 +320,7 @@ int gfs2_meta_wait(struct gfs2_sbd *sdp, struct buffer_head *bh)
if (!buffer_uptodate(bh)) {
struct gfs2_trans *tr = current->journal_info;
if (tr && tr->tr_touched)
if (tr && test_bit(TR_TOUCHED, &tr->tr_flags))
gfs2_io_error_bh(sdp, bh);
return -EIO;
}
@ -346,7 +346,7 @@ void gfs2_remove_from_journal(struct buffer_head *bh, int meta)
tr->tr_num_buf_rm++;
else
tr->tr_num_databuf_rm++;
tr->tr_touched = 1;
set_bit(TR_TOUCHED, &tr->tr_flags);
was_pinned = 1;
brelse(bh);
}

19
fs/gfs2/trans.c
View File

@ -48,7 +48,7 @@ int gfs2_trans_begin(struct gfs2_sbd *sdp, unsigned int blocks,
tr->tr_blocks = blocks;
tr->tr_revokes = revokes;
tr->tr_reserved = 1;
tr->tr_alloced = 1;
set_bit(TR_ALLOCED, &tr->tr_flags);
if (blocks)
tr->tr_reserved += 6 + blocks;
if (revokes)
@ -78,7 +78,8 @@ static void gfs2_print_trans(const struct gfs2_trans *tr)
{
pr_warn("Transaction created at: %pSR\n", (void *)tr->tr_ip);
pr_warn("blocks=%u revokes=%u reserved=%u touched=%u\n",
tr->tr_blocks, tr->tr_revokes, tr->tr_reserved, tr->tr_touched);
tr->tr_blocks, tr->tr_revokes, tr->tr_reserved,
test_bit(TR_TOUCHED, &tr->tr_flags));
pr_warn("Buf %u/%u Databuf %u/%u Revoke %u/%u\n",
tr->tr_num_buf_new, tr->tr_num_buf_rm,
tr->tr_num_databuf_new, tr->tr_num_databuf_rm,
@ -89,12 +90,12 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
{
struct gfs2_trans *tr = current->journal_info;
s64 nbuf;
int alloced = tr->tr_alloced;
int alloced = test_bit(TR_ALLOCED, &tr->tr_flags);
BUG_ON(!tr);
current->journal_info = NULL;
if (!tr->tr_touched) {
if (!test_bit(TR_TOUCHED, &tr->tr_flags)) {
gfs2_log_release(sdp, tr->tr_reserved);
if (alloced) {
kfree(tr);
@ -112,8 +113,8 @@ void gfs2_trans_end(struct gfs2_sbd *sdp)
gfs2_print_trans(tr);
gfs2_log_commit(sdp, tr);
if (alloced && !tr->tr_attached)
kfree(tr);
if (alloced && !test_bit(TR_ATTACHED, &tr->tr_flags))
kfree(tr);
up_read(&sdp->sd_log_flush_lock);
if (sdp->sd_vfs->s_flags & MS_SYNCHRONOUS)
@ -182,7 +183,7 @@ void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
gfs2_log_lock(sdp);
}
gfs2_assert(sdp, bd->bd_gl == gl);
tr->tr_touched = 1;
set_bit(TR_TOUCHED, &tr->tr_flags);
if (list_empty(&bd->bd_list)) {
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
set_bit(GLF_DIRTY, &bd->bd_gl->gl_flags);
@ -201,7 +202,7 @@ static void meta_lo_add(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
tr = current->journal_info;
tr->tr_touched = 1;
set_bit(TR_TOUCHED, &tr->tr_flags);
if (!list_empty(&bd->bd_list))
return;
set_bit(GLF_LFLUSH, &bd->bd_gl->gl_flags);
@ -256,7 +257,7 @@ void gfs2_trans_add_revoke(struct gfs2_sbd *sdp, struct gfs2_bufdata *bd)
BUG_ON(!list_empty(&bd->bd_list));
gfs2_add_revoke(sdp, bd);
tr->tr_touched = 1;
set_bit(TR_TOUCHED, &tr->tr_flags);
tr->tr_num_revoke++;
}