linux-kernel - Re: [PATCH 04/22] block: Abstract out bvec iterator

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: <20130809010530.GG15409@kmo-pixel>
Date:	Thu, 8 Aug 2013 18:05:30 -0700
From:	Kent Overstreet <kmo@...erainc.com>
To:	Ed Cashin <ecashin@...aid.com>
Cc:	"axboe@...nel.dk" <axboe@...nel.dk>,
	"neilb@...e.de" <neilb@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"dm-devel@...hat.com" <dm-devel@...hat.com>,
	"linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>
Subject: Re: [PATCH 04/22] block: Abstract out bvec iterator

On Thu, Aug 08, 2013 at 08:59:11PM -0400, Ed Cashin wrote:
> On Aug 8, 2013, at 8:09 PM, Kent Overstreet wrote:
> 
> > On Wed, Aug 07, 2013 at 10:04:36PM -0400, Ed Cashin wrote:
> >> On Aug 7, 2013, at 5:54 PM, Kent Overstreet wrote:
> >> 
> >>> Immutable biovecs are going to require an explicit iterator. To
> >>> implement immutable bvecs, a later patch is going to add a bi_bvec_done
> >>> member to this struct; for now, this patch effectively just renames
> >>> things.
> >> 
> >> Hi, Kent Overstreet.  Thanks for Cc'ing me and for the promising work.
> >> 
> >> Were you able to do sanity tests with aoe this time around?  Last time, basic I/O was not working with the immutable biovec patches applied.
> >> 
> >> Here is my 28 June email about my experiences with git://evilpiepirate.org/~kent/linux-bcache.git at that time.  It also includes information about creating an easy software-only aoe test environment.
> >> 
> >>  http://thread.gmane.org/gmane.linux.kernel/1505222/focus=1517924
> > 
> > Hey, thanks for testing it - sorry, I think I remember seeing that email
> > last time and got sidetracked before I got around to setting up some
> > tests.
> 
> No worries.
> 
> > I think I've got it working now, it's running the same stress tests I
> > use for bcache. Here's a fixed patch, I broke the aoe changes out into
> > their own patch since they were more involved than most of the others:
> 
> I had added your git tree as a remote and checked out the for-jens branch.  This patch conflicts with some of the changes in that patch, so I could use a pointer as to which base this new patch applies to.
> 
> If it's already in some branch in linux-bcache, I can just use it there, and that's even more convenient.

It's in the for-jens branch now.

> 
> > (I am seeing a bug where it's getting stuck after running stress tests
> > for awhile, but I can reproduce that without the aoe changes too...)
> 
> Just so I know what to look for, what does that behavior look like?  I/O stops going and procs get stuck in disk sleep, maybe?

Yeah, pretty much.

My test script isn't really doing anything interesting, just using
dbench and bonnie to generate random-ish mixed load. It's running in a
vm where the block devices are files in a tmpfs on the host, though.

Here's the test script - http://evilpiepirate.org/~kent/rc
--
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/