- 01 Jul, 2020 30 commits
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John Garry authored
sbitmap works by maintaining separate bitmaps of set and cleared bits. The set bits are cleared in a batch, to save the burden of continuously locking the "word" map to unset. sbitmap_bitmap_show() only shows the set bits (in "word"), which is not too much use, so mask out the cleared bits. Fixes: ea86ea2c ("sbitmap: ammortize cost of clearing bits") Signed-off-by:
John Garry <john.garry@huawei.com> Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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Christoph Hellwig authored
Instead just iterate over the inodes for the block device superblock. Reviewed-by:
Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by:
Christoph Hellwig <hch@lst.de> Signed-off-by:
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Christoph Hellwig authored
Reviewed-by:
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Christoph Hellwig authored
Just use bd_disk->queue instead. Reviewed-by:
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Christoph Hellwig authored
We can trivially calculate the block size from the inodes i_blkbits variable. Use that instead of keeping two redundant copies of the information in slightly different formats. Reviewed-by:
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Christoph Hellwig authored
The loop to increase the initial block size doesn't really make any sense, as the AND operation won't match for powers of two if it didn't for the initial block size. Signed-off-by:
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Christoph Hellwig authored
bd_block_size contains a value that matches the logic block size when opening, so the statement is redundant. Even if it wasn't the dumb assignment would cause a a mismatch with bd_inode->i_blkbits. Reviewed-by:
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Christoph Hellwig authored
Use the block_size helper instead of open coding it. Also remove the check for a 0 block size, as that can't happen. Reviewed-by:
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Hongnan Li authored
ktime_to_ns(ktime_get()), which is expensive, does not need to be called if blk_iolatency_enabled() return false in blkcg_iolatency_done_bio(). Postponing ktime_to_ns(ktime_get()) execution reduces the CPU usage when blk_iolatency is disabled. Signed-off-by:
Hongnan Li <hongnan.li@linux.alibaba.com> Signed-off-by:
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Christoph Hellwig authored
Now that submit_bio_noacct has a decent blk-mq fast path there is no more need for this bypass. Signed-off-by:
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Christoph Hellwig authored
For blk-mq drivers bios can only be inserted for the same queue. So bypass the complicated sorting logic in __submit_bio_noacct with a blk-mq simpler submission helper. Signed-off-by:
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Christoph Hellwig authored
Split out a __submit_bio_noacct helper for the actual de-recursion algorithm, and simplify the loop by using a continue when we can't enter the queue for a bio. Signed-off-by:
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Christoph Hellwig authored
generic_make_request has always been very confusingly misnamed, so rename it to submit_bio_noacct to make it clear that it is submit_bio minus accounting and a few checks. Signed-off-by:
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Christoph Hellwig authored
The make_request_fn is a little weird in that it sits directly in struct request_queue instead of an operation vector. Replace it with a block_device_operations method called submit_bio (which describes much better what it does). Also remove the request_queue argument to it, as the queue can be derived pretty trivially from the bio. Signed-off-by:
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Christoph Hellwig authored
The variable is only used once, so just open code the bio_sector() there. Signed-off-by:
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Christoph Hellwig authored
All registers disks must have a valid queue pointer, so don't bother to log a warning for that case. Signed-off-by:
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Christoph Hellwig authored
The "generic_make_request: " prefix has no value, and will soon become stale. Signed-off-by:
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Christoph Hellwig authored
The queue can be trivially derived from the bio, so pass one less argument. Signed-off-by:
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Christoph Hellwig authored
All bios can get remapped if submitted to partitions. No need to comment on that. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Nothing in bcache actually uses the ->queuedata field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
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Christoph Hellwig authored
Instead of setting up the queuedata as well just use one private data field. Signed-off-by:
Geert Uytterhoeven <geert@linux-m68k.org> Acked-by:
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Hou Tao authored
Just use rq directly, the usage of list_entry_rq() doesn't make any sense. Signed-off-by:
Hou Tao <houtao1@huawei.com> Reviewed-by:
Ming Lei <ming.lei@redhat.com> Reviewed-by:
Bart Van Assche <bvanassche@acm.org> Signed-off-by:
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- 30 Jun, 2020 10 commits
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Colin Ian King authored
There is a statement that is indented one level too deeply, fix it by removing a tab. Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
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Ming Lei authored
Move .nr_active update and request assignment into blk_mq_get_driver_tag(), all are good to do during getting driver tag. Meantime blk-flush related code is simplified and flush request needn't to update the request table manually any more. Signed-off-by:
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Ming Lei authored
It is used by blk-mq.c only, so move it to the source file. Suggested-by:
Christoph Hellwig <hch@infradead.org> Signed-off-by:
Hannes Reinecke <hare@suse.de> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by:
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Ming Lei authored
blk_mq_get_driver_tag() is only used by blk-mq.c and is supposed to stay in blk-mq.c, so move it and preparing for cleanup code of get/put driver tag. Meantime hctx_may_queue() is moved to header file and it is fine since it is defined as inline always. No functional change. Signed-off-by:
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Ming Lei authored
More and more drivers want to get batching requests queued from block layer, such as mmc, and tcp based storage drivers. Also current in-tree users have virtio-scsi, virtio-blk and nvme. For none, we already support batching dispatch. But for io scheduler, every time we just take one request from scheduler and pass the single request to blk_mq_dispatch_rq_list(). This way makes batching dispatch not possible when io scheduler is applied. One reason is that we don't want to hurt sequential IO performance, becasue IO merge chance is reduced if more requests are dequeued from scheduler queue. Try to support batching dispatch for io scheduler by starting with the following simple approach: 1) still make sure we can get budget before dequeueing request 2) use hctx->dispatch_busy to evaluate if queue is busy, if it is busy we fackback to non-batching dispatch, otherwise dequeue as many as possible requests from scheduler, and pass them to blk_mq_dispatch_rq_list(). Wrt. 2), we use similar policy for none, and turns out that SCSI SSD performance got improved much. In future, maybe we can develop more intelligent algorithem for batching dispatch. Baolin has tested this patch and found that MMC performance is improved[3]. [1] https://lore.kernel.org/linux-block/20200512075501.GF1531898@T590/#r [2] https://lore.kernel.org/linux-block/fe6bd8b9-6ed9-b225-f80c-314746133722@grimberg.me/ [3] https://lore.kernel.org/linux-block/CADBw62o9eTQDJ9RvNgEqSpXmg6Xcq=2TxH0Hfxhp29uF2W=TXA@mail.gmail.com/Signed-off-by:
Baolin Wang <baolin.wang7@gmail.com> Reviewed-by:
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Ming Lei authored
Pass obtained budget count to blk_mq_dispatch_rq_list(), and prepare for supporting fully batching submission. With the obtained budget count, it is easier to put extra budgets in case of .queue_rq failure. Meantime remove the old 'got_budget' parameter. Signed-off-by:
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Ming Lei authored
When BLK_STS_RESOURCE or BLK_STS_DEV_RESOURCE is returned from .queue_rq, the 'list' variable always holds this rq which isn't queued to LLD successfully. So blk_mq_dispatch_rq_list() always returns false from the branch of '!list_empty(list)'. No functional change. Signed-off-by:
Sagi Grimberg <sagi@grimberg.me> Reviewed-by:
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Ming Lei authored
Move code for getting driver tag and budget into one helper, so blk_mq_dispatch_rq_list gets a bit simplified, and easier to read. Meantime move updating of 'no_tag' and 'no_budget_available' into the branch for handling partial dispatch because that is exactly consumer of the two local variables. Also rename the parameter of 'got_budget' as 'ask_budget'. No functional change. Signed-off-by:
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Ming Lei authored
All requests in the 'list' of blk_mq_dispatch_rq_list belong to same hctx, so it is better to pass hctx instead of request queue, because blk-mq's dispatch target is hctx instead of request queue. Signed-off-by:
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Ming Lei authored
blk-mq budget is abstract from scsi's device queue depth, and it is always per-request-queue instead of hctx. It can be quite absurd to get a budget from one hctx, then dequeue a request from scheduler queue, and this request may not belong to this hctx, at least for bfq and deadline. So fix the mess and always pass request queue to get/put budget callback. Signed-off-by:
Douglas Anderson <dianders@chromium.org> Reviewed-by:
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