Re: Design notes for BufMgrLock rewrite

>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:
   Tom> and changing the buf_table hash table.  The only common   Tom> operation that needs exclusive lock is reading
ina page that   Tom> was not in shared buffers already, which will require at   Tom> least a kernel call and usually a
waitfor I/O, so it will be   Tom> slow anyway.
 

Why not a separate lock per bucket chain in the hash table in addition
to the system-wide LWLock ? It's not so much that such an operation will be
slow anyway but that such a slow operation will unnecessarily block
other operations.

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Sailesh
http://www.cs.berkeley.edu/~sailesh