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| author |  Yu Kuai <yukuai3@huawei.com>
| 2023-05-29 21:11:04 +0800 |
|---|---|---|
| committer |  Song Liu <song@kernel.org>
| 2023-06-13 15:25:44 -0700 |
| commit | a022325ab970cf04b66ca128a87345714aa44b99 (patch) | |
| tree | db2f8e093f6dbe631cc3bedd27e11887a073a403 /drivers/md/md.c | |
| parent | md/raid1-10: submit write io directly if bitmap is not enabled (diff) | |
| download | linux-a022325ab970cf04b66ca128a87345714aa44b99.tar.gz linux-a022325ab970cf04b66ca128a87345714aa44b99.tar.bz2 linux-a022325ab970cf04b66ca128a87345714aa44b99.zip | |
md/md-bitmap: add a new helper to unplug bitmap asynchrously
If bitmap is enabled, bitmap must update before submitting write io, this
is why unplug callback must move these io to 'conf->pending_io_list' if
'current->bio_list' is not empty, which will suffer performance
degradation.
A new helper md_bitmap_unplug_async() is introduced to submit bitmap io
in a kworker, so that submit bitmap io in raid10_unplug() doesn't require
that 'current->bio_list' is empty.
This patch prepare to limit the number of plugged bio.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230529131106.2123367-6-yukuai1@huaweicloud.com
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 0aec2954e161..cf3733c90c47 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -83,6 +83,7 @@ static struct module *md_cluster_mod; static DECLARE_WAIT_QUEUE_HEAD(resync_wait); static struct workqueue_struct *md_wq; static struct workqueue_struct *md_misc_wq; +struct workqueue_struct *md_bitmap_wq; static int remove_and_add_spares(struct mddev *mddev, struct md_rdev *this); @@ -9637,6 +9638,11 @@ static int __init md_init(void) if (!md_misc_wq) goto err_misc_wq; + md_bitmap_wq = alloc_workqueue("md_bitmap", WQ_MEM_RECLAIM | WQ_UNBOUND, + 0); + if (!md_bitmap_wq) + goto err_bitmap_wq; + ret = __register_blkdev(MD_MAJOR, "md", md_probe); if (ret < 0) goto err_md; @@ -9655,6 +9661,8 @@ static int __init md_init(void) err_mdp: unregister_blkdev(MD_MAJOR, "md"); err_md: + destroy_workqueue(md_bitmap_wq); +err_bitmap_wq: destroy_workqueue(md_misc_wq); err_misc_wq: destroy_workqueue(md_wq); @@ -9951,6 +9959,7 @@ static __exit void md_exit(void) spin_unlock(&all_mddevs_lock); destroy_workqueue(md_misc_wq); + destroy_workqueue(md_bitmap_wq); destroy_workqueue(md_wq); } |