Re: splice: move balance_dirty_pages_ratelimited() outside of splice actor

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, Jun 12 2007, Andrew Morton wrote:
> On Tue, 12 Jun 2007 14:44:50 +0200 Jens Axboe <[email protected]> wrote:
> 
> > splice
> 
> btw, I'm staring in profound mystification at this:
> 
> int generic_pipe_buf_steal(struct pipe_inode_info *pipe,
> 			   struct pipe_buffer *buf)
> {
> 	struct page *page = buf->page;
> 
> 	if (page_count(page) == 1) {
> 		lock_page(page);
> 		return 0;
> 	}
> 
> 	return 1;
> }
> 
> 
> afacit that `if page_count(page)' test could be replaced by
> `if today_is_tuesday()'.  But then I don't have the foggiest idea
> what it's trying to do.
> 
> It would be nice to get some comments in and around here.
> 
> Also, I was trying to work out the role and responsibility of the ->pin
> callback, and gave up.
> 
> There isn't a lot of point in explaining this over email - one should be
> able to gain an understanding of these things by reading the code.  I think
> the best way of tackling this would be to comprehensively document
> pipe_buf_operations and pipe_inode_info, please...

OK so I wont explain it in detail here, I'll write up a good set of
comments tonight.

-- 
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux