diff options
| author | Christoph Hellwig <hch@lst.de> | 2020-09-24 08:51:34 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-09-24 13:43:39 -0600 |
| commit | c2e4cd57cfa1f627b786c764d185fff85fd12be9 (patch) | |
| tree | 7b562f0ea09b6bf6dc45c14a7938ead0daab2aee /drivers/md/raid0.c | |
| parent | 16ef510139315a2147ee7525796f8dbd4e4b7864 (diff) | |
block: lift setting the readahead size into the block layer
Drivers shouldn't really mess with the readahead size, as that is a VM
concept. Instead set it based on the optimal I/O size by lifting the
algorithm from the md driver when registering the disk. Also set
bdi->io_pages there as well by applying the same scheme based on
max_sectors. To ensure the limits work well for stacking drivers a
new helper is added to update the readahead limits from the block
limits, which is also called from disk_stack_limits.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md/raid0.c')
| -rw-r--r-- | drivers/md/raid0.c | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c index f54a449f97aa..aa2d72791768 100644 --- a/drivers/md/raid0.c +++ b/drivers/md/raid0.c @@ -410,22 +410,6 @@ static int raid0_run(struct mddev *mddev) mdname(mddev), (unsigned long long)mddev->array_sectors); - if (mddev->queue) { - /* calculate the max read-ahead size. - * For read-ahead of large files to be effective, we need to - * readahead at least twice a whole stripe. i.e. number of devices - * multiplied by chunk size times 2. - * If an individual device has an ra_pages greater than the - * chunk size, then we will not drive that device as hard as it - * wants. We consider this a configuration error: a larger - * chunksize should be used in that case. - */ - int stripe = mddev->raid_disks * - (mddev->chunk_sectors << 9) / PAGE_SIZE; - if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) - mddev->queue->backing_dev_info->ra_pages = 2* stripe; - } - dump_zones(mddev); ret = md_integrity_register(mddev); |