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| Filename | Latest commit message | Latest commit date |
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908adce646
bpf_skb_adjust_room calls skb_cow on grow. This expensive operation can be avoided in the fast path when the only other clone has released the header. This is the common case for TCP, where one headerless clone is kept on the retransmit queue. It is safe to do so even when touching the gso fields in skb_shinfo. Regular tunnel encap with iptunnel_handle_offloads takes the same optimization. The tcp stack unclones in the unlikely case that it accesses these fields through headerless clones packets on the retransmit queue (see __tcp_retransmit_skb). If any other clones are present, e.g., from packet sockets, skb_cow_head returns the same value as skb_cow(). Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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| 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.