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| author | Yu Kuai <yukuai3@huawei.com> | 2024-02-29 10:57:06 +0100 |
|---|---|---|
| committer | Song Liu <song@kernel.org> | 2024-03-01 07:49:45 +0100 |
| commit | 2c27d09d3a76b33629d2e681bf8b774f776ade7f (patch) | |
| tree | 522d44db48c73783e8e6e5dbb2e47629b920e380 /drivers/md/raid1.h | |
| parent | md/raid1: factor out helpers to add rdev to conf (diff) | |
| download | linux-2c27d09d3a76b33629d2e681bf8b774f776ade7f.tar.xz linux-2c27d09d3a76b33629d2e681bf8b774f776ade7f.zip | |
md/raid1: record nonrot rdevs while adding/removing rdevs to conf
For raid1, each read will iterate all the rdevs from conf and check if
any rdev is non-rotational, then choose rdev with minimal IO inflight
if so, or rdev with closest distance otherwise.
Disk nonrot info can be changed through sysfs entry:
/sys/block/[disk_name]/queue/rotational
However, consider that this should only be used for testing, and user
really shouldn't do this in real life. Record the number of non-rotational
disks in conf, to avoid checking each rdev in IO fast path and simplify
read_balance() a little bit.
Co-developed-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Paul Luse <paul.e.luse@linux.intel.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240229095714.926789-4-yukuai1@huaweicloud.com
Diffstat (limited to '')
| -rw-r--r-- | drivers/md/raid1.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/raid1.h b/drivers/md/raid1.h index 14d4211a123a..5300cbaa58a4 100644 --- a/drivers/md/raid1.h +++ b/drivers/md/raid1.h @@ -71,6 +71,7 @@ struct r1conf { * allow for replacements. */ int raid_disks; + int nonrot_disks; spinlock_t device_lock; |