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cc3cec8367
In testing high frequency workloads with provided buffers, we spend a lot of time in allocating and freeing the buffer units themselves. Rather than repeatedly free and alloc them, add a recycling cache instead. There are two caches: - ctx->io_buffers_cache. This is the one we grab from in the submission path, and it's protected by ctx->uring_lock. For inline completions, we can recycle straight back to this cache and not need any extra locking. - ctx->io_buffers_comp. If we're not under uring_lock, then we use this list to recycle buffers. It's protected by the completion_lock. On adding a new buffer, check io_buffers_cache. If it's empty, check if we can splice entries from the io_buffers_comp_cache. This reduces about 5-10% of overhead from provided buffers, bringing it pretty close to the non-provided path. Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.