Dave Chinner <da...@fromorbit.com> writes:
> On Wed, Jan 15, 2014 at 02:29:40PM -0800, Jeff Janes wrote:
>> And most importantly, "Also, please don't freeze up everything else in the
>> process"
> If you hand writeback off to the kernel, then writeback for memory
> reclaim needs to take precedence over "metered writeback". If we are
> low on memory, then cleaning dirty memory quickly to avoid ongoing
> allocation stalls, failures and potentially OOM conditions is far more
> important than anything else.....
I think you're in violent agreement, actually. Jeff's point is exactly
that we'd rather the checkpoint deadline slid than that the system goes
to hell in a handbasket for lack of I/O cycles. Here "metered" really
means "do it as a low-priority task".
regards, tom lane
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