Re: [PATCH] arch/tile: add /proc/tile, /proc/sys/tile, and a sysfs cpu attribute

On Wednesday 25 May 2011 22:31:37 Chris Metcalf wrote:

On 5/25/2011 4:20 PM, Arnd Bergmann wrote:

quoted

On Wednesday 25 May 2011 21:18:05 Chris Metcalf wrote:

quoted

The contents of the hardwall ID file are then just a cpulist of the cpus
covered by the hardwall, rather than introducing a new convention (as
quoted above, e.g. "2x2 1,1").  Individual tasks that are in the hardwall
can be found by reading the "hardwall" files, and we can learn where they
are bound in the hardwall by reading the "stat" file as is normal for
learning process affinity.

Be careful with listing PID values in the hardwall files, as the PIDs
may not be unique or visible if you combine this with PID name spaces.
I guess the right solution would be to only list the tasks that are
present in the name space of the thread reading the file.

Sorry not to be clearer -- I am no longer listing any PID values in the
hardwall files, for that exact reason.  You have to look at
/proc/*/hardwall (or /proc/*/tasks/*/hardwall) to find the files that are
in a particular hardwall.  This pattern is not one that's normally directly
useful, though, so I'm happy leaving it to userspace if it's desired.

Ok, thanks for the clarification.

	Arnd