On 3/29/21 5:26 PM, Ming Lei wrote:
Add one req flag REQ_POLL_CTX which will be used in the following patch for
supporting bio based IO polling.
Exactly this flag can help us to do:
1) request flag is cloned in bio_fast_clone(), so if we mark one FS bio
as REQ_POLL_CTX, all bios cloned from this FS bio will be marked as
REQ_POLL_CTX too.
2) create per-task io polling context if the bio based queue supports
polling and the submitted bio is HIPRI. Per-task io poll context will be
created during submit_bio() before marking this HIPRI bio as REQ_POLL_CTX.
Then we can avoid to create such io polling context if one cloned bio with
REQ_POLL_CTX is submitted from another kernel context.
3) for supporting bio based io polling, we need to poll IOs from all
underlying queues of the bio device, this way help us to recognize which
IO needs to polled in bio based style, which will be applied in
following patch.
Reviewed-by: Jeffle Xu <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
---
block/blk-core.c | 28 ++++++++++++++++++++++++++--
include/linux/blk_types.h | 4 ++++
2 files changed, 30 insertions(+), 2 deletions(-)
Reviewed-by: Hannes Reinecke <[email protected]>
Cheers,
Hannes
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