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3f93f82988
Currently, fragmented pages from the page pool can be released in two ways: 1) In the mlx5e driver when trimming off the unused fragments AND the associated skb fragments have been released. This path allows recycling of pages to the page pool cache (allow_direct == true). 2) On the skb release path (last fragment release), which will always release pages to the page pool ring (allow_direct == false). Whichever is releasing the last fragment will be decisive on where the page gets released: the cache or the ring. So we obviously want to maximize for doing the release from 1. This patch does that by deferring the release of page fragments right before requesting new ones from the page pool. A flag is added to make sure that there's no release before first alloc and that XDP_TX fragments are not released prematurely. This is a preparation patch that doesn't unlock the performance improvements yet. A followup patch will do that. Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com> Reviewed-by: Tariq Toukan <tariqt@nvidia.com> Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
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.