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Calling verity_verify_io in bh for IO of all sizes is not suitable for embedded devices. From our tests, it can improve the performance of 4K synchronise random reads. For example: ./fio --name=rand_read --ioengine=psync --rw=randread --bs=4K \ --direct=1 --numjobs=8 --runtime=60 --time_based --group_reporting \ --filename=/dev/block/mapper/xx-verity But it will degrade the performance of 512K synchronise sequential reads on our devices. For example: ./fio --name=read --ioengine=psync --rw=read --bs=512K --direct=1 \ --numjobs=8 --runtime=60 --time_based --group_reporting \ --filename=/dev/block/mapper/xx-verity A parameter array is introduced by this change. And users can modify the default config by /sys/module/dm_verity/parameters/use_bh_bytes. The default limits for NONE/RT/BE is set to 8192. The default limits for IDLE is set to 0. Call verity_verify_io directly when verity_end_io is not in hardirq. Signed-off-by: LongPing Wei <weilongping@oppo.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> |
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| .. | ||
| cache-policies.rst | ||
| cache.rst | ||
| delay.rst | ||
| dm-clone.rst | ||
| dm-crypt.rst | ||
| dm-dust.rst | ||
| dm-ebs.rst | ||
| dm-flakey.rst | ||
| dm-ima.rst | ||
| dm-init.rst | ||
| dm-integrity.rst | ||
| dm-io.rst | ||
| dm-log.rst | ||
| dm-queue-length.rst | ||
| dm-raid.rst | ||
| dm-service-time.rst | ||
| dm-uevent.rst | ||
| dm-zoned.rst | ||
| era.rst | ||
| index.rst | ||
| kcopyd.rst | ||
| linear.rst | ||
| log-writes.rst | ||
| persistent-data.rst | ||
| snapshot.rst | ||
| statistics.rst | ||
| striped.rst | ||
| switch.rst | ||
| thin-provisioning.rst | ||
| unstriped.rst | ||
| vdo-design.rst | ||
| vdo.rst | ||
| verity.rst | ||
| writecache.rst | ||
| zero.rst | ||