Re: [PATCH v3 1/5] perf_event: introduce 'inject' event and get HZ

[Ingo Molnar]

* Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> OK so there is no sysconf() syscall and its all implemented in glibc, which 
> is utter suckage.. will have to come up with something saner then.

I think integrating it into the perf stream of events would be the most 
desirable approach - tooling could make use of it easily.

For data record (and hierarchy) description /debug/tracing/events/ would be 
useful.

We dont want to actually 'activate' them in an 'event' fashion - but we could 
use event IDs and the record format and the transport to describe and recover 
the values.

For transport we could use the mmap ring-buffer and it would also be nice to 
add (or resurrect) some 'quick & easy' read()/write() based transport. It a 
bit like a value read-out from a counter - just here it's not a regular 
counter but some sort of kernel-internal value that we want to provide.

Hm?

	Ingo
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