linux-kernel - Re: [PATCH v1] Increase MAX_NR_CPUS and MAX

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Date:   Mon, 24 Jun 2019 21:04:41 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc:     Kyle Meyer <meyerk@....com>, Kyle Meyer <kyle.meyer@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH v1] Increase MAX_NR_CPUS and MAX_CACHES

On Mon, Jun 24, 2019 at 03:50:58PM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> > diff --git a/samples/bpf/map_perf_test_user.c b/samples/bpf/map_perf_test_user.c
> > index fe5564bff39b..da3c101ca776 100644
> > --- a/samples/bpf/map_perf_test_user.c
> > +++ b/samples/bpf/map_perf_test_user.c
> > @@ -22,7 +22,7 @@
> >  #include "bpf_load.h"
> >  
> >  #define TEST_BIT(t) (1U << (t))
> > -#define MAX_NR_CPUS 1024
> > +#define MAX_NR_CPUS 2048
> >  
> >  static __u64 time_get_ns(void)
> >  {
> > diff --git a/tools/perf/perf.h b/tools/perf/perf.h
> > index 711e009381ec..74d0124d38f3 100644
> > --- a/tools/perf/perf.h
> > +++ b/tools/perf/perf.h
> > @@ -26,7 +26,7 @@ static inline unsigned long long rdclock(void)
> >  }
> >  
> >  #ifndef MAX_NR_CPUS
> > -#define MAX_NR_CPUS			1024
> > +#define MAX_NR_CPUS			2048
> >  #endif
> >  
> >  extern const char *input_name;
> > diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> > index 06ddb6618ef3..abc9c2145efe 100644
> > --- a/tools/perf/util/header.c
> > +++ b/tools/perf/util/header.c
> > @@ -1121,7 +1121,7 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
> >  	return 0;
> >  }
> >  
> > -#define MAX_CACHES 2000
> > +#define MAX_CACHES (MAX_NR_CPUS * 4)

maybe we should re-do this via dynamic allocation ;-)
but for now it's ok

would be nice to have perf change separated, anyway for perf part:

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka