Re: Free WAL caches on switching segments

ITAGAKI Takahiro wrote:
> Bruce Momjian <pgman@candle.pha.pa.us> wrote:
>
> > I looked this over and I am unsure what this does for us that isn't
> > already accomplished using the wal_sync_method settings.  See xlog.c for
> > a description of O_DIRECT and when it is used.
>
> I proposed it to supplement the cache control. There are some OSes that
> supports posix_fadvise but not O_DIRECT, for example, NetBSD 4.0
> (http://www.netbsd.org/Changes/changes-4.0.html).

Oh, that makes sense then.   Let me re-add it to the queue.

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