linux-kernel - Re: dm: Make MIN_IOS, et al, tunable via sysctl.

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Message-ID: <1376924652.24869.39.camel@bobble.lax.corp.google.com>
Date:	Mon, 19 Aug 2013 08:04:12 -0700
From:	Frank Mayhar <fmayhar@...gle.com>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	linux-kernel@...r.kernel.org, dm-devel@...hat.com
Subject: Re: dm: Make MIN_IOS, et al, tunable via sysctl.

On Mon, 2013-08-19 at 09:40 -0400, Mike Snitzer wrote:
> On Sat, Aug 17 2013 at  8:30am -0400,
> Alasdair G Kergon <agk@...hat.com> wrote:
> 
> > On Fri, Aug 16, 2013 at 03:55:21PM -0700, Frank Mayhar wrote:
> > > This patch fixes that by changing the hardcoded MIN_IOS (and certain
> > > other) #defines in dm-crypt, dm-io, dm-mpath, dm-snap and dm itself to
> > > sysctl-modifiable values.  This lets us change the size of these pools
> > > on the fly, we can reduce the size of the pools and reduce memory
> > > pressure.
> >  
> > Did you consider using module_param_named()?
> > (E.g. dm_verity_prefetch_cluster in dm-verity.)
> 
> Right, I'd prefer to see this be implemented in terms of
> module_param_named().  Aside from dm-verity, dm-bufio.c makes the most
> use of it.

Yeah, I can do that.
-- 
Frank Mayhar
310-460-4042

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