[RFC v3] fiber: Increase default stack size

[Cyrill Gorcunov]

On Tue, Feb 26, 2019 at 01:36:59PM +0300, Vladimir Davydov wrote:
> On Tue, Feb 26, 2019 at 01:26:56PM +0300, Vladimir Davydov wrote:
> >  - 1 MB for max stack size seems to be a bit of an overkill for now.
> >    The default value should be set to 256 KB, but we do need a
> >    configuration option for it. Let's add it to the fiber Lua module.
> >    May be done in a separate patch, but should be submitted together in
> >    the same patch set.
> 
> Almost forgot. We should also print a warning to the log if some fiber
> has gone too close to the stack limit (say half of the max allocation)
> to indicate that the max stack size should be increased.

Do we have something similar to printf_ratelimited() so we wouldn't
spam a user too much?