[Linux-ia64] ia64 rwsem using atomic primitive

From: Chen, Kenneth W <kenneth.w.chen_at_intel.com>
Date: 2003-02-20 05:29:35
I have converted rw semaphore from current generic spin_lock implementation to use architecture specific atomic operation on ia64.  This new scheme speeds up all the semaphore operations in the fast path with atomic instruction and fall back to a heavy function when there are read/write contention.  I've also taken some raw measurement how fast it improves.  The most significant gain comes from parallel reader lock acquire/release which has around 6.6X speed up with the new version.  Here is a patch against 2.4.20.

- Ken

Received on Wed Feb 19 10:29:39 2003

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