Greetings, * Andres Freund (and...@anarazel.de) wrote: > On 2020-12-04 13:27:38 -0500, Stephen Frost wrote: > > If I follow correctly, this patch will scan ahead in the WAL and let > > the kernel know that certain blocks will be needed soon. Ideally, > > though I don't think it does yet, we'd only do that for blocks that > > aren't already in shared buffers, and only for non-FPIs (even better if > > we can skip past pages for which we already, recently, passed an FPI). > > The patch uses PrefetchSharedBuffer(), which only initiates a prefetch > if the page isn't already in s_b.
Great, glad that's already been addressed in this, that's certainly good. I think I knew that and forgot it while composing that response over the past rather busy week. :) > And once we have AIO, it can actually initiate IO into s_b at that > point, rather than fetching it just into the kernel page cache. Sure. Thanks, Stephen
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