>>>>> "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
