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SubjectRe: [PATCH v4 1/3] perf: Use monotonic clock as a source for timestamps
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On Wed, 2015-01-21 at 15:52 +0000, Pawel Moll wrote:
> On Mon, 2015-01-05 at 13:00 +0000, Peter Zijlstra wrote:
> > On Thu, Nov 06, 2014 at 04:51:56PM +0000, Pawel Moll wrote:
> > > Documentation/kernel-parameters.txt | 9 +++++++++
> > > kernel/events/core.c | 37 +++++++++++++++++++++++++++++++++++++
> > > 2 files changed, 46 insertions(+)
> >
> > > diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> > > index 4c81a86..8ead8d8 100644
> > > --- a/Documentation/kernel-parameters.txt
> > > +++ b/Documentation/kernel-parameters.txt
> >
> > > @@ -2763,6 +2764,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> > > allocator. This parameter is primarily for debugging
> > > and performance comparison.
> > >
> > > + perf_use_local_clock
> > > + [PERF]
> > > + Use local_clock() as a source for perf timestamps
> > > + generation. This was be the default behaviour and
> > > + this parameter can be used to maintain backward
> > > + compatibility or on older hardware with expensive
> > > + monotonic clock source.
> > > +
> > > pf. [PARIDE]
> > > See Documentation/blockdev/paride.txt.
> >
> > So I'm always terminally confused on the naming of kernel parameters,
> > sometimes things are modules (even when they're not actually =m capable)
> > and get a module::foo naming or so and sometimes they're not.
>
> I guess you mean module.foo?
>
> > So we want to use the module naming thing or not?
>
> Honestly, I don't mind either way. For one thing ftrace doesn't bother
> and just uses __setup() as well.

There's one more thing to this - as far as I remember, the module name
is actually derived from the compilation unit name (at some level of
Kbuild). I may be wrong (will have to double check), but a module
parameter defined in kernel/events/core.c may be called something like
"core.parameter" ;-).

Pawel



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