linux-kernel - Re: [patch 14/22] pollfs: pollable futex

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Message-ID: <a36005b50705030640t1169c2d0g1c6cf9d5ec9a9d36@mail.gmail.com>
Date:	Thu, 3 May 2007 06:40:54 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"Davi Arnaut" <davi@...ent.com.br>
Cc:	"Eric Dumazet" <dada1@...mosbay.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Davide Libenzi" <davidel@...ilserver.org>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [patch 14/22] pollfs: pollable futex

On 5/2/07, Davi Arnaut <davi@...ent.com.br> wrote:
> The usage cases of yours are quite different from mine. We don't use a
> single file descriptor to to manage various resources. The worker threads
> are _not going_ to have a file descriptor, _only_ the event dispatching
> (poll)
> thread.

An model which doesn't scale well.

> A pollable futex is even more useful for _single_ threaded programs that
> don't want to go into lengthy hacks to monitor events coming from the
> outside
> world.

There is nothing here that cannot be done with a more complete model
for event handling.  It's Linus decision whether he wants to add yet
more code, yet more possible problems, yet more maintenance
overhead/nightmare for an interim solution which isn't necessary,
which cannot solve all the problems, and which is not as scalable as
other proposed methods.

I can only say that I would be trickly against it.  It makes just no sense.
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