Re: Move PinBuffer and UnpinBuffer to atomics

I have run with -P option, I ran for 1200 second and set -P as 30 second, and what I observed is that when its low its low throughout the run and when its high, Its high for complete run.

Non Default Parameter:

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shared_buffer 8GB

Max Connections 150

./pgbench -c $threads -j $threads -T 1200 -M prepared -S -P 30 postgres 

Test results are attached in result.tar file.

File details:

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   1. head_run1.txt                           --> 20 mins run on head reading 1

   2. head_run2.txt                           --> 20 mins run on head reading 2

   3. head_patch_run1.txt                --> 20 mins run on head + patch reading 1

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