On Mon, Jul 26, 2004 at 08:47:57PM -0500, Dimitri Sivanich wrote:

While you've got irq's disabled, drain_array() (the function my patch removes)
acquires the cache spin_lock, then releases it.  Cache_reap then acquires
it again (with irq's having been off the entire time).  My testing has found
that simply acquiring the lock once while irq's are off results in fewer
excessively long latencies.

Results probably vary somewhat depending on the circumstance.

Of course, I should add that all of this is from the perspective of the
cpu doing the cache_reap.  If others feel that this may add too much
latency to other paths, other solutions may be in order.
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