...and BTW, what is MMCacheLock?? is that an attempt at padding already?
One would hope not, as it would be a totally braindead attempt :) It appears to have been formerly used by smgr/mm.c; when that was removed, the MMCacheLock should have been removed but was not. Barring any objections, I'll remove it from HEAD tomorrow.
It looks like padding out LWLock struct would ensure that each of those were in separate cache lines?
Sounds like it might be worth trying; since it would be trivial to implement for testing purposes, I'd be curious to see if this improves performance, and/or has any effect on the CS storm issue.
-Neil
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