Re: [PATCH] generic_file_sendpage

[Jan Blunck <j.blunck@tu-harburg.de>]

Linus Torvalds wrote:
> "sendfile()" in general I think has been a mistake. It's too specialized,
> and the interface has always sucked.

Ok, you're right. I will have a look at the pipe buffer stuff.

> As Andrew pointed out, it actually
> needs to limit the number of buffers in flight partly because otherwise 
> you have uninterruptible kernel work etc etc.

Hmm, sendfile() uses do_generic_mapping_read() which is calling the 
file_send_actor() per page. The actor calls ->sendpage(). I don't see 
any situation how this could lead to uninterruptible kernel work when 
the sendpage() itself is checking for signals. There are only 2 pages in 
flight in this case.

Jan
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