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Repair out-of-date information in src/backend/storage/buffer/README.

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In commit d526575f89, we changed things so
that buffer usage counts are incremented when the buffer is pinned, rather
than when it is unpinned, but the README file didn't get the memo.

Report by Amit Kapila.
This commit is contained in:
Robert Haas
2012-05-22 09:30:59 -04:00
parent b94ce6e807
commit 219c024c64
1 changed files with 2 additions and 2 deletions
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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
this:
Each buffer header contains a usage counter, which is incremented (up to a
small limit value) whenever the buffer is unpinned. (This requires only the
buffer header spinlock, which would have to be taken anyway to decrement the
small limit value) whenever the buffer is pinned. (This requires only the
buffer header spinlock, which would have to be taken anyway to increment the
buffer reference count, so it's nearly free.)
The "clock hand" is a buffer index, NextVictimBuffer, that moves circularly