forked from Minki/linux
mainlining shenanigans
4d9237e32c
Particularly for networked workloads, io_uring intensively uses its poll based backend to get a notification when data/space is available. Profiling workloads, we see 3-4% of alloc+free that is directly attributed to just the apoll allocation and free (and the rest being skb alloc+free). For the fast path, we have ctx->uring_lock held already for both issue and the inline completions, and we can utilize that to avoid any extra locking needed to have a basic recycling cache for the apoll entries on both the alloc and free side. Double poll still requires an allocation. But those are rare and not a fast path item. With the simple cache in place, we see a 3-4% reduction in overhead for the workload. Signed-off-by: Jens Axboe <axboe@kernel.dk> |
||
|---|---|---|
| arch | ||
| block | ||
| 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.