Re: [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats

On 05/30/2012 04:48 PM, Paul Turner wrote:

a) the information in /proc/stat is actually much denser since it's
"cpu VAL VAL VAL VAL" as opposed to "cpuX.FIELD VAL"

easily fixable here. Less descriptive, but we can use a header line
with the description much like how /proc/slabinfo does, and we still
have an extensible interface that is dense, at the same time.

b) If it became a problem the /proc/stat case is actually fairly
trivially fixable by defining each cpu as a record and "everything
else" as a magic im-out-of-cpus value.

quoted

quoted

 Now, if you guys are okay with a file per-cpu, I can do it as well.
 It pollutes the filesystem, but at least protects against the fact that this
 is kmalloc-backed.

As I prefaced, I'm not sure there's much that can be trivially done
about it.  This is really a fundamental limitation of how read_map()
works.

What we really need is a proper seq_file exposed through cftypes.

That can be done.