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ocfs2: adjust enabling place for la window

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Patch series "improve write IO performance when fragmentation is high",
v6.


This patch (of 4):

After introducing gd->bg_contig_free_bits, the code path
'ocfs2_cluster_group_search() => ocfs2_local_alloc_seen_free_bits()'
becomes death when all the gd->bg_contig_free_bits are set to the correct
value.  This patch relocates ocfs2_local_alloc_seen_free_bits() to a more
appropriate location.  (The new place being ocfs2_block_group_set_bits().)

In ocfs2_local_alloc_seen_free_bits(), the scope of the spin-lock has been
adjusted to reduce meaningless lock races.  e.g: when userspace creates &
deletes 1 cluster_size files in parallel, acquiring the spin-lock in
ocfs2_local_alloc_seen_free_bits() is totally pointless and impedes IO
performance.

Link: https://lkml.kernel.org/r/20240328125203.20892-3-heming.zhao@suse.com
Signed-off-by: Heming Zhao <heming.zhao@suse.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Heming Zhao 2024-03-28 20:52:01 +08:00 committed by Andrew Morton
parent 4eb7b93e03
commit f51dac026f
2 changed files with 8 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

11
fs/ocfs2/localalloc.c
View file

@ -212,14 +212,15 @@ static inline int ocfs2_la_state_enabled(struct ocfs2_super *osb)
void ocfs2_local_alloc_seen_free_bits(struct ocfs2_super *osb,
unsigned int num_clusters)
{
spin_lock(&osb->osb_lock);
if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
osb->local_alloc_state == OCFS2_LA_THROTTLED)
if (num_clusters >= osb->local_alloc_default_bits) {
if (num_clusters >= osb->local_alloc_default_bits) {
spin_lock(&osb->osb_lock);
if (osb->local_alloc_state == OCFS2_LA_DISABLED ||
osb->local_alloc_state == OCFS2_LA_THROTTLED) {
cancel_delayed_work(&osb->la_enable_wq);
osb->local_alloc_state = OCFS2_LA_ENABLED;
}
spin_unlock(&osb->osb_lock);
spin_unlock(&osb->osb_lock);
}
}
void ocfs2_la_enable_worker(struct work_struct *work)

9
fs/ocfs2/suballoc.c
View file

@ -1372,6 +1372,7 @@ int ocfs2_block_group_set_bits(handle_t *handle,
int journal_type = OCFS2_JOURNAL_ACCESS_WRITE;
unsigned int start = bit_off + num_bits;
u16 contig_bits;
struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
/* All callers get the descriptor via
* ocfs2_read_group_descriptor(). Any corruption is a code bug. */
@ -1421,6 +1422,7 @@ int ocfs2_block_group_set_bits(handle_t *handle,
if (contig_bits > max_contig_bits)
max_contig_bits = contig_bits;
bg->bg_contig_free_bits = cpu_to_le16(max_contig_bits);
ocfs2_local_alloc_seen_free_bits(osb, max_contig_bits);
} else {
bg->bg_contig_free_bits = 0;
}
@ -1587,13 +1589,6 @@ static int ocfs2_cluster_group_search(struct inode *inode,
* of bits. */
if (min_bits <= res->sr_bits)
search = 0; /* success */
else if (res->sr_bits) {
/*
* Don't show bits which we'll be returning
* for allocation to the local alloc bitmap.
*/
ocfs2_local_alloc_seen_free_bits(osb, res->sr_bits);
}
}
return search;