On Wed, Jan 4, 2012 at 7:24 AM, Heikki Linnakangas
<heikki.linnakan...@enterprisedb.com> wrote:

> Setting a latch that's already set is fast,
> but surely it's even faster to not even try.

Agreed. I think we should SetLatch() at the first point a backend
writes a dirty buffer because the bgwriter has been inactive.

Continually waking the bgwriter makes it harder for it to return to sleep.

-- 
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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