[6.12] bcache IO hinting updates #35
Draft
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…ack hints Add sysfs entries to support to hint for bypass/writeback by the ioprio assigned to the bio. If the bio is unassigned, use current's io-context ioprio for cache writeback or bypass (configured per-process with `ionice`). Having idle IOs bypass the cache can increase performance elsewhere since you probably don't care about their performance. In addition, this prevents idle IOs from promoting into (polluting) your cache and evicting blocks that are more important elsewhere. If you really nead the performance at the expense of SSD wearout, then configure ioprio_writeback and set your `ionice` appropriately. For example: echo 2,7 > /sys/block/bcache0/bcache/ioprio_bypass echo 2,0 > /sys/block/bcache0/bcache/ioprio_writeback See the documentation commit for details. v2: Removed calls to get_task_io_context() Signed-off-by: Eric Wheeler <[email protected]> Acked-by: Kent Overstreet <[email protected]> Tested-by: Kai Krakow <[email protected]> Cc: [email protected] Signed-off-by: Kai Krakow <[email protected]>
v2: get_task_io_context() no longer exists in the kernel Signed-off-by: Eric Wheeler <[email protected]> Signed-off-by: Kai Krakow <[email protected]>
Even if ioprio_bypass hints bypassing the request, we still allow it for REQ_META|REQ_PRIO bio. Cc: Eric Wheeler <[email protected]> Signed-off-by: Kai Krakow <[email protected]>
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Export patch series: https://github.com/kakra/linux/pull/35.patch