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

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Message-ID: <x49r4lvadvl.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 08 Jan 2013 10:33:18 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Kent Overstreet <koverstreet@...gle.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

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?

-Jeff
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