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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130108160654.GA25098@localhost>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/