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GFS2: Reduce contention on gfs2_log_lock 

This patch modifies functions gfs2_trans_add_meta and _data so that
they check whether the buffer_head is already in a transaction,
and if so, avoid taking the gfs2_log_lock.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Bob Peterson 2017-01-30 11:51:21 -05:00
parent 192738b711
commit aacee72061
1 changed files with 11 additions and 2 deletions
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13
fs/gfs2/trans.c
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@ -170,6 +170,10 @@ void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
}
lock_buffer(bh);
if (buffer_pinned(bh)) {
set_bit(TR_TOUCHED, &tr->tr_flags);
goto out;
}
gfs2_log_lock(sdp);
bd = bh->b_private;
if (bd == NULL) {
@ -192,6 +196,7 @@ void gfs2_trans_add_data(struct gfs2_glock *gl, struct buffer_head *bh)
list_add_tail(&bd->bd_list, &tr->tr_databuf);
}
gfs2_log_unlock(sdp);
out:
unlock_buffer(bh);
}
@ -201,10 +206,14 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
struct gfs2_bufdata *bd;
struct gfs2_meta_header *mh;
struct gfs2_trans *tr;
struct gfs2_trans *tr = current->journal_info;
enum gfs2_freeze_state state = atomic_read(&sdp->sd_freeze_state);
lock_buffer(bh);
if (buffer_pinned(bh)) {
set_bit(TR_TOUCHED, &tr->tr_flags);
goto out;
}
gfs2_log_lock(sdp);
bd = bh->b_private;
if (bd == NULL) {
@ -220,7 +229,6 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
gfs2_log_lock(sdp);
}
gfs2_assert(sdp, bd->bd_gl == gl);
tr = current->journal_info;
set_bit(TR_TOUCHED, &tr->tr_flags);
if (!list_empty(&bd->bd_list))
goto out_unlock;
@ -243,6 +251,7 @@ void gfs2_trans_add_meta(struct gfs2_glock *gl, struct buffer_head *bh)
tr->tr_num_buf_new++;
out_unlock:
gfs2_log_unlock(sdp);
out:
unlock_buffer(bh);
}