Messages in this thread | | | Date | Fri, 23 May 2014 13:30:26 -0400 | From | Don Zickus <> | Subject | Re: [PATCH 6/7] perf: Add support to dynamically get cacheline size |
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On Fri, May 23, 2014 at 07:09:01PM +0200, Jiri Olsa wrote: > On Mon, May 19, 2014 at 03:13:52PM -0400, Don Zickus wrote: > > SNIP > > > diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h > > index 61a6548..b3e7b22 100644 > > --- a/tools/perf/util/cpumap.h > > +++ b/tools/perf/util/cpumap.h > > @@ -81,4 +81,16 @@ static inline int cpu__get_node(int cpu) > > return cpunode_map[cpu]; > > } > > > > +int cacheline_size; > > hum, so cacheline_size does not need to be global, if you use > cpu__cacheline_size in your next patch, right?
I made cpu__cacheline_size an inline so I think it does. If I stick that function in cpumap.c then yeah I would agree it would not need to be global.
Being that is was going to be called repeatedly while processing each event I opted to make it an inline. I guess I could change that if it matters.
> > > + > > +int cpu__setup_cacheline_size(void); > > + > > +static inline int cpu__cacheline_size(void) > > +{ > > + if (unlikely(!cacheline_size)) > > + pr_debug("cacheline size not initialized\n"); > > + > > + return cacheline_size; > > +} > > + > > #endif /* __PERF_CPUMAP_H */ > > diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c > > index 635cd8f..50adbfb 100644 > > --- a/tools/perf/util/sort.c > > +++ b/tools/perf/util/sort.c > > @@ -2,6 +2,7 @@ > > #include "hist.h" > > #include "comm.h" > > #include "symbol.h" > > +#include "cpumap.h" > > > > regex_t parent_regex; > > const char default_parent_pattern[] = "^sys_|^do_page_fault"; > > @@ -1117,6 +1118,8 @@ int setup_sorting(void) > > return -ENOMEM; > > } > > > > + cpu__setup_cacheline_size(); > > + > > I dont think this is the best place to call the setup, > on the other hand I can't think of any suitable ;-) > > how about lazy initialization from cpu__cacheline_size? > > We also have page_size variable which gets initialized > in main and is globaly accesable. I wonder we should > add the cacheline_size variable in the same way.
That seems to make sense. I can stick the variable in util.c|h then?
Cheers, Don
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