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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Le lundi 12 décembre 2011 à 18:42 +0200, Daniel Baluta a écrit :

> 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.



--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Index of Archives]     [Linux Kernel Discussion]     [TCP Instrumentation]     [Ethernet Bridging]     [Linux Wireless Networking]     [Linux WPAN Networking]     [Linux Host AP]     [Linux WPAN Networking]     [Linux Bluetooth Networking]     [Linux ATH6KL Networking]     [Linux Networking Users]     [Linux Coverity]     [VLAN]     [Git]     [IETF Annouce]     [Linux Assembly]     [Security]     [Bugtraq]     [Yosemite Information]     [MIPS Linux]     [ARM Linux Kernel]     [ARM Linux]     [Linux Virtualization]     [Linux IDE]     [Linux RAID]     [Linux SCSI]