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f43fdeb9a3
Merge async IO IOCB_NOWAIT support from Ming: "This patchset improves loop aio perf by using IOCB_NOWAIT for avoiding to queue aio command to workqueue context, meantime refactor lo_rw_aio() a bit. In my test VM, loop disk perf becomes very close to perf of the backing block device(nvme/mq virtio-scsi). And Mikulas verified that this way can improve 12jobs sequential readwrite io by ~5X, and basically solve the reported problem together with loop MQ change. https://lore.kernel.org/linux-block/a8e5c76a-231f-07d1-a394-847de930f638@redhat.com/ Zhaoyang Huang also mentioned it may fix their performance issue on Android use case. The loop MQ change will be posted as standalone patch, because it needs UAPI change." Link: https://lore.kernel.org/linux-block/20251015110735.1361261-1-ming.lei@redhat.com/ Signed-off-by: Jens Axboe <axboe@kernel.dk> * loop-aio-nowait: loop: add hint for handling aio via IOCB_NOWAIT loop: try to handle loop aio command via NOWAIT IO first loop: move command blkcg/memcg initialization into loop_queue_work loop: add lo_submit_rw_aio() loop: add helper lo_rw_aio_prep() loop: add helper lo_cmd_nr_bvec()
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.