linux-kernel - Re: [PATCH 29/32] block, aio: Batch completion for bios/kiocbs

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Date:	Tue, 8 Jan 2013 08:06:54 -0800
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	linux-aio@...ck.org, linux-fsdevel@...r.kernel.org, zab@...hat.com,
	bcrl@...ck.org, viro@...iv.linux.org.uk, tytso@....edu
Subject: Re: [PATCH 29/32] block, aio: Batch completion for bios/kiocbs

On Tue, Jan 08, 2013 at 10:33:18AM -0500, Jeff Moyer wrote:
> Kent Overstreet <koverstreet@...gle.com> writes:
> 
> >> Is the rbtree really faster than a basic (l)list and a sort before
> >> completing them? Would be simpler.
> >
> > Well, depends. With one or two kioctxs? The list would definitely be
> > faster, but I'm loathe to use an O(n^2) algorithm anywhere where the
> > input size isn't strictly controlled, and I know of applications out
> > there that use tons of kioctxs.
> 
> Out of curiosity, what applications do you know of that use tons of
> kioctx's?

"tons" is relative I suppose, but before this patch series sharing a
kioctx between threads was really bad for performance and... you know
how people can be with threads.
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