Re: logging data to a file.

[Thomas Petazzoni <thomas.petazzoni@xxxxxxxx>]

Hi,

Jesper Juhl wrote:

> Get the data to userspace via printk/sysfs/netlink or some such, then
> write the data to a file in userspace.

I don't think sysfs is designed to transfer data from the kernel to
userspace applications, it's dedicated to exporting attributes of
devices to userspace.

Concerning Netlink, as far as I know the number of communication
channels is limited, and one can create its own simply (that's why the
Netfilter guys introduced nf_netlink, which multiplexes the
Netfilter-reserved Netlink socket). Am I wrong ?

To transfer large amount of data from the kernel to user space, 2.6.14
introduced "relayfs" [1], primarly used by the Linux Trace Toolkit, but
that can be used for other purposes.

Sincerly,

Thomas

[1] http://www.opersys.com/relayfs/
-- 
Thomas Petazzoni
thomas.petazzoni@xxxxxxxx

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