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

Ingo Molnar
2007-02-22T15:34:16Z

* Ingo Molnar <mingo@elte.hu> wrote:

> > The pushback to the primary thread you speak of is just extra work
> > in my mind, for networking. Better to just begin operations and sit
> > in the primary thread(s) waiting for events, and when they arrive
> > push the operations further along using non-blocking writes, reads,
> > and accept() calls. There is no blocking context really needed for
> > these kinds of things, so a mechanism that tries to provide one is a
> > waste.
>
> one question is, what is cheaper, to block out of a read and a write and
^-------to back out
> to set up the event notification and then to return to the user
> context, or to just stay right in there with all the context already
> constructed and on the stack, and schedule away and then come back and
> queue back to the primary thread once the condition the thread is
> waiting for is done? The latter isnt all that unattractive in my mind,
> because it always does forward progress, with minimal 'backout' costs.

Ingo