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[AF_UNIX]: Convert to use a spinlock instead of rwlock
From: Benjamin LaHaise <[email protected]> In af_unix, a rwlock is used to protect internal state. At least on my P4 with HT it is faster to use a spinlock due to the simpler memory barrier used to unlock. This patch raises bw_unix to ~690K/s. Signed-off-by: David S. Miller <[email protected]>
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