Re: LWLock cache line alignment

Simon Riggs wrote:
> ...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