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Try to reduce cache line contentions in peer management, to reduce IP
defragmentation overhead.
- peer_fake_node is marked 'const' to make sure its not modified.
(tested with CONFIG_DEBUG_RODATA=y)
- Group variables in two structures to reduce number of dirtied cache
lines. One named "peers" for avl tree root, its number of entries, and
associated lock. (candidate for RCU conversion)
- A second one named "unused_peers" for unused list and its lock
- Add a !list_empty() test in unlink_from_unused() to avoid taking lock
when entry is not unused.
- Use atomic_dec_and_lock() in inet_putpeer() to avoid taking lock in
some cases.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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