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Commit219c024

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Repair out-of-date information in src/backend/storage/buffer/README.
In commitd526575, we changed things sothat buffer usage counts are incremented when the buffer is pinned, ratherthan when it is unpinned, but the README file didn't get the memo.Report by Amit Kapila.
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‎src/backend/storage/buffer/README

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@@ -169,8 +169,8 @@ need to take system-wide locks during common operations. It works like
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this:
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Each buffer header contains a usage counter, which is incremented (up to a
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small limit value) whenever the buffer isunpinned. (This requires only the
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buffer header spinlock, which would have to be taken anyway todecrement the
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small limit value) whenever the buffer ispinned. (This requires only the
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buffer header spinlock, which would have to be taken anyway toincrement the
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buffer reference count, so it's nearly free.)
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The "clock hand" is a buffer index, NextVictimBuffer, that moves circularly

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