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Willem de Bruijn says: ==================== udp msg_zerocopy Enable MSG_ZEROCOPY for udp sockets Patch 1/3 is the main patch, a rework of RFC patch http://patchwork.ozlabs.org/patch/899630/ more details in the patch commit message Patch 2/3 is an optimization to remove a branch from the UDP hot path and refcount_inc/refcount_dec_and_test pair when zerocopy is used. This used to be included in the first patch in v2. Patch 3/3 runs the already existing udp zerocopy tests as part of kselftest See also recent Linux Plumbers presentation https://linuxplumbersconf.org/event/2/contributions/106/attachments/104/128/willemdebruijn-lpc2018-udpgso-presentation-20181113.pdf Changes: v1 -> v2 - Fixup reverse christmas tree violation v2 -> v3 - Split refcount avoidance optimization into separate patch - Fix refcount leak on error in fragmented case (thanks to Paolo Abeni for pointing this one out!) - Fix refcount inc on zero v3 -> v4 - Move skb_zcopy_set below the only kfree_skb that might cause a premature uarg destroy before skb_zerocopy_put_abort - Move the entire skb_shinfo assignment block, to keep that cacheline access in one place ==================== Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.