mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-09 06:41:06 -04:00
229a7b6350
Provide the completion state to the handlers that we know can complete inline, so they can utilize this for batching completions. Cap the max batch count at 32. This should be enough to provide a good amortization of the cost of the lock+commit dance for completions, while still being low enough not to cause any real latency issues for SQPOLL applications. Xuan Zhuo <xuanzhuo@linux.alibaba.com> reports that this changes his profile from: 17.97% [kernel] [k] copy_user_generic_unrolled 13.92% [kernel] [k] io_commit_cqring 11.04% [kernel] [k] __io_cqring_fill_event 10.33% [kernel] [k] udp_recvmsg 5.94% [kernel] [k] skb_release_data 4.31% [kernel] [k] udp_rmem_release 2.68% [kernel] [k] __check_object_size 2.24% [kernel] [k] __slab_free 2.22% [kernel] [k] _raw_spin_lock_bh 2.21% [kernel] [k] kmem_cache_free 2.13% [kernel] [k] free_pcppages_bulk 1.83% [kernel] [k] io_submit_sqes 1.38% [kernel] [k] page_frag_free 1.31% [kernel] [k] inet_recvmsg to 19.99% [kernel] [k] copy_user_generic_unrolled 11.63% [kernel] [k] skb_release_data 9.36% [kernel] [k] udp_rmem_release 8.64% [kernel] [k] udp_recvmsg 6.21% [kernel] [k] __slab_free 4.39% [kernel] [k] __check_object_size 3.64% [kernel] [k] free_pcppages_bulk 2.41% [kernel] [k] kmem_cache_free 2.00% [kernel] [k] io_submit_sqes 1.95% [kernel] [k] page_frag_free 1.54% [kernel] [k] io_put_req [...] 0.07% [kernel] [k] io_commit_cqring 0.44% [kernel] [k] __io_cqring_fill_event Signed-off-by: Jens Axboe <axboe@kernel.dk>
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 Restructured Text 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.