On Sat, 16 Jan 2010 02:11:33 +0000
Ben Hutchings [off-list ref] wrote:

On Thu, 2010-01-14 at 14:56 -0800, Stephen Hemminger wrote:

quoted

On Thu, 14 Jan 2010 13:56:23 -0800 (PST)
Tom Herbert [off-list ref] wrote:

[...]

quoted

quoted

The CPU masks is set on a per device basis in the sysfs variable
/sys/class/net/<device>/rps_cpus.  This is a set of canonical bit maps for
each NAPI nstance of the device.  For example:

echo "0b 0b0 0b00 0b000" > /sys/class/net/eth0/rps_cpus

Why not make a kobject out of cpus which would add subdirectory.
This would keep interface consistent with the one value per file
semantic of sysfs.

Do you mean a kobject per NAPI context, each initially with a rps_cpus
attribute holding a CPU mask, or a kobject per CPU, each with an
attribute specifying which NAPI contexts it does work for?  (Personally
I'd favour the first.)

Yes, make NAPI real kobjects, linked to device.

BUT
make sure this also handles case of N to 1 mapping as well
as 1 to N case.