[dm-devel] dm: Make MIN_IOS, et al, tunable via sysctl.
Mike Snitzer
snitzer at redhat.com
Mon Aug 19 13:40:39 UTC 2013
On Sat, Aug 17 2013 at 8:30am -0400,
Alasdair G Kergon <agk at redhat.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.
Mike
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