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Date: Tue, 26 Feb 2019 15:54:57 +0300
From: Cyrill Gorcunov <gorcunov@gmail.com>
Subject: Re: [RFC v3] fiber: Increase default stack size
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To: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: =?utf-8?B?0JPQtdC+0YDQs9C40Lkg0JrQuNGA0LjRh9C10L3QutC+?= <georgy@tarantool.org>, tarantool-patches@freelists.org
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On Tue, Feb 26, 2019 at 03:34:56PM +0300, Vladimir Davydov wrote:
> > 
> > If we want to scatter we should simply put marks at page bounds.
> > Dirtifying somewhere inside middle of a page is useless.
> 
> Hmm, why? Consider the example with PATH_MAX buffer. Putting dirty marks
> at page boundaries doesn't guarantee any of them will get overwritten by
> the buffer if only a few hundred of bytes are used. I think we should
> dirty the last page or two at random intervals - this should increase
> the chance that at least one mark is overwritten by any function that is
> eager for the stack.

Ah, I got what you mean. Look, maybe we should consider pagemap too?
iirc readin pagemap should be cheap but need to read the code though,
will try once time permit.