RFC: Changing default filesystem parameters for power management reasons

[Jeff Moyer]

Matthew Garrett <mjg at redhat.com> writes:

> On Fri, Nov 28, 2008 at 12:33:53PM +0000, David Woodhouse wrote:
>> On Thu, 2008-11-27 at 16:44 +0000, Matthew Garrett wrote:
>> > It would be nice to have the kernel export disk access via a socket or 
>> > something rather than the currently available debug option, which is to 
>> > dump to dmesg which then triggers log writes which triggers more 
>> > messages and fail occurs.
>> 
>> Does blktrace trigger log writes?
>
> I was thinking of the vm_dump interface - I'd never noticed blktrace, 
> which looks pretty much ideal. Now we just need a user-friendly 
> front-end.

Define user-friendly.  There is blkparse, which will format things for
you.

Cheers,
Jeff