linux-kernel - Re: [PATCH V8 20/23] perf tools: making function set_max_cpu

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Message-ID: <20160125212955.GG22501@kernel.org>
Date:	Mon, 25 Jan 2016 18:29:55 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:	linux-doc@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH V8 20/23] perf tools: making function set_max_cpu_num()
 non static

Em Mon, Jan 25, 2016 at 06:12:42PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Jan 25, 2016 at 01:46:22PM -0700, Mathieu Poirier escreveu:
> > On 14 January 2016 at 14:46, Mathieu Poirier <mathieu.poirier@...aro.org> wrote:
> > > For memory allocation purposes, code located in other places
> > > then util/cpumap.c may want to know how many CPUs the system has.
> > >
> > > This patch is making function set_max_cpu_num() available to
> > > other parts of the perf tool so that global variable
> > > 'max_cpu_num' gets the right value when referenced by cpu__max_cpu().
> > >
> > > Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > > Cc: Ingo Molnar <mingo@...hat.com>
> > > Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> > > Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> > > ---
> > >  tools/perf/util/cpumap.c | 2 +-
> > >  tools/perf/util/cpumap.h | 1 +
> > >  2 files changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
> > > index 10af1e7524fb..ae179320c0c0 100644
> > > --- a/tools/perf/util/cpumap.c
> > > +++ b/tools/perf/util/cpumap.c
> > > @@ -380,7 +380,7 @@ out:
> > >  }
> > >
> > >  /* Determine highest possible cpu in the system for sparse allocation */
> > > -static void set_max_cpu_num(void)
> > > +void set_max_cpu_num(void)
> > >  {
> > >         const char *mnt;
> > >         char path[PATH_MAX];
> > > diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
> > > index 85f7772457fa..45fa963345eb 100644
> > > --- a/tools/perf/util/cpumap.h
> > > +++ b/tools/perf/util/cpumap.h
> > > @@ -14,6 +14,7 @@ struct cpu_map {
> > >         int map[];
> > >  };
> > >
> > > +void set_max_cpu_num(void);
> > >  struct cpu_map *cpu_map__new(const char *cpu_list);
> > >  struct cpu_map *cpu_map__empty_new(int nr);
> > >  struct cpu_map *cpu_map__dummy_new(void);
> > > --
> > > 2.1.4
> > >
> > 
> > Arnaldo,
> > 
> > I can't queue this patch for 4.6 without at least a reviewed by from you.
> 
> This one I remember, looks ugly, the name set_max_cpu_num() looks
> strange, when that was restricted (static) to that cpumap.c file, it
> wasn't a problem, exporting it for wider usage looks bad.
> 
> You've been waiting for this for quite a while, it seems, lemme stop
> what I am doing to check this...

So, please check the patch below, what you need then is just to use
cpu__max_cpu().

- Arnaldo

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index fa935093a599..9bcf2bed3a6d 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -8,6 +8,10 @@
 #include <linux/bitmap.h>
 #include "asm/bug.h"
 
+static int max_cpu_num;
+static int max_node_num;
+static int *cpunode_map;
+
 static struct cpu_map *cpu_map__default_new(void)
 {
 	struct cpu_map *cpus;
@@ -486,6 +490,32 @@ out:
 		pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
 }
 
+int cpu__max_node(void)
+{
+	if (unlikely(!max_node_num))
+		set_max_node_num();
+
+	return max_node_num;
+}
+
+int cpu__max_cpu(void)
+{
+	if (unlikely(!max_cpu_num))
+		set_max_cpu_num();
+
+	return max_cpu_num;
+}
+
+int cpu__get_node(int cpu)
+{
+	if (unlikely(cpunode_map == NULL)) {
+		pr_debug("cpu_map not initialized\n");
+		return -1;
+	}
+
+	return cpunode_map[cpu];
+}
+
 static int init_cpunode_map(void)
 {
 	int i;
diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 71c41b9efabb..81a2562aaa2b 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -57,37 +57,11 @@ static inline bool cpu_map__empty(const struct cpu_map *map)
 	return map ? map->map[0] == -1 : true;
 }
 
-int max_cpu_num;
-int max_node_num;
-int *cpunode_map;
-
 int cpu__setup_cpunode_map(void);
 
-static inline int cpu__max_node(void)
-{
-	if (unlikely(!max_node_num))
-		pr_debug("cpu_map not initialized\n");
-
-	return max_node_num;
-}
-
-static inline int cpu__max_cpu(void)
-{
-	if (unlikely(!max_cpu_num))
-		pr_debug("cpu_map not initialized\n");
-
-	return max_cpu_num;
-}
-
-static inline int cpu__get_node(int cpu)
-{
-	if (unlikely(cpunode_map == NULL)) {
-		pr_debug("cpu_map not initialized\n");
-		return -1;
-	}
-
-	return cpunode_map[cpu];
-}
+int cpu__max_node(void);
+int cpu__max_cpu(void);
+int cpu__get_node(int cpu);
 
 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
 		       int (*f)(struct cpu_map *map, int cpu, void *data),