linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Message-ID: <20070222150239.GA21945@2ka.mipt.ru>
Date:	Thu, 22 Feb 2007 18:02:41 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	David Miller <davem@...emloft.net>
Cc:	mingo@...e.hu, arjan@...radead.org, drepper@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	hch@...radead.org, akpm@....com.au, alan@...rguk.ukuu.org.uk,
	zach.brown@...cle.com, suparna@...ibm.com, davidel@...ilserver.org,
	jens.axboe@...cle.com, tglx@...utronix.de
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thu, Feb 22, 2007 at 06:47:04AM -0800, David Miller (davem@...emloft.net) wrote:
> As a side note although Evgeniy likes M:N threading model ideas, they
> are a mine field wrt. signal semantics.  Solaris guys took several
> years to get it right, just grep through the Solaris kernel patch
> readme files over the years to get an idea of how bad it can be.  I
> would therefore never advocate such an approach.

I have fully synchronous kevent signal delivery for that purpose :)
Having all events synchronous allows trivial handling of them -
including signals.

> The more I think about it, a reasonable solution might actually be to
> use threadlets for disk I/O and pure event based processing for
> networking.  It is two different handling paths and non-unified,
> but that might be the price for good performance :-)

Hmm, yes, for such scenario we need some kind of event delivery
mechanism, which would allow to wait on different kinds of events.

In the above sentence I see known to pain letters - 
letter k
letter e
letter v
letter e
letter n
letter t

Or more modern trend - async_wait(epoll).

-- 
	Evgeniy Polyakov
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