Re: [PATCH RESEND 9/9] block, trace: implement ioblame - IO tracerwith origin tracking

[Namhyung Kim]

2012-01-12 10:44 AM, Tejun Heo wrote:
> On Wed, Jan 11, 2012 at 5:41 PM, Namhyung Kim<namhyung.kim@xxxxxxx>  wrote:
> > OK, but that can be controlled from userspace, I guess? Do we have to care
> > about that?
>
> Otherwise, it's gonna be a pretty silly interface. If you want to
> watch the TP, you have to restart the whole thing which also implies
> intent number would change. And there still is the problem of losing
> new intent events due to overflow. It just isn't the right interface
> for the task.

I understood it's unreliable. BTW I think that sane userland tool must 
start both of ioblame_io and ioblame_create_intent, say, TPs at once - 
prior to triggering ioblame/enable, obviously. The ioblame/intents can 
be used as a backup just in case.

Thanks,
Namhyung Kim
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