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43f51df417
sk_rx_dst/sk_rx_dst_ifindex/sk_rx_dst_cookie are read in early demux, and currently spans two cache lines. Moving them close to sk_refcnt makes more sense, as only one cache line is needed. New layout for this hot cache line is : struct sock { struct sock_common __sk_common; /* 0 0x88 */ /* --- cacheline 2 boundary (128 bytes) was 8 bytes ago --- */ struct dst_entry * sk_rx_dst; /* 0x88 0x8 */ int sk_rx_dst_ifindex; /* 0x90 0x4 */ u32 sk_rx_dst_cookie; /* 0x94 0x4 */ socket_lock_t sk_lock; /* 0x98 0x20 */ atomic_t sk_drops; /* 0xb8 0x4 */ int sk_rcvlowat; /* 0xbc 0x4 */ /* --- cacheline 3 boundary (192 bytes) --- */ Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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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.