Messages in this thread |  | | Date | Wed, 16 Aug 2017 10:28:03 -0400 | From | Steven Rostedt <> | Subject | Re: [PATCH] tracer: hwlat: allow to be default bootup tracer |
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On Fri, 11 Aug 2017 17:01:21 +0530 Pratyush Anand <panand@redhat.com> wrote:
> hwlat is not a production kernel tracer, however it can be used to > identify any HW latency issue during kernel boot as well.Therefore call > init_hwlat_tracer() though core_initcall() so that we can pass > ftrace=hwlat in kernel commandline parameter and we can have hwlat as > default bootup tracer. > > Signed-off-by: Pratyush Anand <panand@redhat.com> > --- > kernel/trace/trace_hwlat.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c > index d7c8e4ec3d9d..09f8f0950b6c 100644 > --- a/kernel/trace/trace_hwlat.c > +++ b/kernel/trace/trace_hwlat.c > @@ -630,4 +630,4 @@ __init static int init_hwlat_tracer(void) > > return 0; > } > -late_initcall(init_hwlat_tracer); > +core_initcall(init_hwlat_tracer);
No that is not the right fix. hwlat tracer should not be called by core init.
I already have a fix in linux-next. I'm doing some more code that needs testing before I send it to Linus.
-- Steve
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