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From: Chris Friesen <cfriesen@nortelnetworks.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@osdl.org>,
	Oleg Nesterov <oleg@tv-sign.ru>,
	William Lee Irwin III <wli@holomorphy.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Make pipe data structure be a circular list of pages, rather than
Date: Fri, 07 Jan 2005 11:45:12 -0600	[thread overview]
Message-ID: <41DECAA8.3040909@nortelnetworks.com> (raw)
In-Reply-To: <1105113998.24187.361.camel@localhost.localdomain>

Alan Cox wrote:
> On Gwe, 2005-01-07 at 16:17, Linus Torvalds wrote:
> 
>>it a "don't do that then", and I'll wait to see if people do. I can't
>>think of anything that cares about performance that does that anyway:  
>>becuase system calls are reasonably expensive regardless, anybody who
>>cares at all about performance will have buffered things up in user space.
> 
> 
> Actually I found a load of apps that do this but they don't care about
> performance. Lots of people have signal handlers that just do
> 
> 	write(pipe_fd, &signr, sizeof(signr))
> 
> so they can drop signalled events into their event loops

I would be one of those people, although I do pass the signal 
information as well.

Chris


  parent reply	other threads:[~2005-01-07 17:51 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-07 14:30 Make pipe data structure be a circular list of pages, rather than Oleg Nesterov
2005-01-07 15:45 ` Alan Cox
2005-01-07 17:23   ` Linus Torvalds
2005-01-08 18:25     ` Hugh Dickins
2005-01-08 18:54       ` Linus Torvalds
2005-01-07 16:17 ` Linus Torvalds
2005-01-07 16:06   ` Alan Cox
2005-01-07 17:33     ` Linus Torvalds
2005-01-07 17:48       ` Linus Torvalds
2005-01-07 20:59         ` Mike Waychison
2005-01-07 23:46           ` Chris Friesen
2005-01-08 21:38             ` Lee Revell
2005-01-08 21:51               ` Linus Torvalds
2005-01-08 22:02                 ` Lee Revell
2005-01-08 22:29                 ` Davide Libenzi
2005-01-09  4:07                 ` Linus Torvalds
2005-01-09 23:19                   ` Davide Libenzi
2005-01-14 10:15             ` Peter Chubb
2005-01-07 21:59         ` Linus Torvalds
2005-01-07 22:53           ` Diego Calleja
2005-01-07 23:15             ` Linus Torvalds
2005-01-10 23:23         ` Robert White
2005-01-07 17:45     ` Chris Friesen [this message]
2005-01-07 16:39   ` Davide Libenzi
2005-01-07 17:09     ` Linus Torvalds
2005-08-18  6:07   ` Coywolf Qi Hunt
  -- strict thread matches above, loose matches on Subject: below --
2005-01-20  2:14 Robert White
2005-01-16  2:59 Make pipe data structure be a circular list of pages, rather Linus Torvalds
2005-01-19 21:12 ` Make pipe data structure be a circular list of pages, rather than linux
2005-01-20  2:06   ` Robert White
     [not found] <Pine.LNX.4.44.0501091946020.3620-100000@localhost.localdomain>
     [not found] ` <Pine.LNX.4.58.0501091713300.2373@ppc970.osdl.org>
     [not found]   ` <Pine.LNX.4.58.0501091830120.2373@ppc970.osdl.org>
2005-01-12 19:50     ` Davide Libenzi
2005-01-12 20:10       ` Linus Torvalds
     [not found] <200501070313.j073DCaQ009641@hera.kernel.org>
2005-01-07  3:41 ` William Lee Irwin III
2005-01-07  6:35   ` Linus Torvalds
2005-01-07  6:37     ` Linus Torvalds
2005-01-19 16:29       ` Larry McVoy
2005-01-19 17:14         ` Linus Torvalds
2005-01-19 19:01           ` Larry McVoy
2005-01-20  0:01             ` Linus Torvalds

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