Re: [PATCH] kref: add function for reading kref value

[Eric Dumazet]

Le lundi 12 dÃcembre 2011 Ã 18:42 +0200, Daniel Baluta a Ãcrit :

> Yes, but you have to do this each time you start debugging, for a
> particular referenced counted object.
> 

What a big deal.

> We must find a clever solution to avoid the noise. (e.g use
> /proc, /sysfs, /debugfs options to trigger dumping info for
> some/all objects with a certain state).
> 
> Usecase:
> 
> At some point we need to know all objects with refcount X,
> and their history of get/put operations.
> 
> For us it would have been very useful when debugging dev
> refcnts problems. With the current implementation kernel
> only dumped info at dev.c:5429:
> 

current on your git repo maybe, not on ours :(

> printk(KERN_EMERG "unregister_netdevice: "
>        waiting for %s to become free. Usage "
>        count = %d\n",
>        dev->name, atomic_read(&dev->refcnt));
> 

This is a very good example where you _cannot_ use kref, since we now
use a percpu refcnt fot netdevice.



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