Richard Huxton <[EMAIL PROTECTED]> writes: > However, one thing you can say is that if block B hasn't been written to > since you last checked, then any blocks older than that haven't been > written to either.
[ itch... ] Can you? I don't recall exactly when a block gets pushed up the ARC list during a ReadBuffer/WriteBuffer cycle, but at the very least I'd have to say that this assumption is vulnerable to race conditions. Also, the cntxDirty mechanism allows a block to be dirtied without changing the ARC state at all. I am not very clear on whether Vadim added that mechanism just for performance or because there were fundamental deadlock issues without it; but in either case we'd have to think long and hard about taking it out for the bgwriter's benefit. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]