libperf: Move 'page_size' global variable to libperf

We need the 'page_size' variable in libperf, so move it there.

Add a libperf_init() as a global libperf init function to obtain this
value via sysconf() at tool start.

Committer notes:

Add internal/lib.h to tools/perf/ files using 'page_size', sometimes
replacing util.h with it if that was the only reason for having util.h
included.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lore.kernel.org/lkml/20190913132355.21634-33-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/auxtrace.c

@@ -50,7 +50,6 @@
 #include "intel-bts.h"
 #include "arm-spe.h"
 #include "s390-cpumsf.h"
-#include "util.h" // page_size
 #include "util/mmap.h"
 
 #include <linux/ctype.h>

tools/perf/util/evlist.c

@@ -17,7 +17,7 @@
 #include "evsel.h"
 #include "debug.h"
 #include "units.h"
-#include "util.h" // page_size
+#include <internal/lib.h> // page_size
 #include "../perf.h"
 #include "asm/bug.h"
 #include "bpf-event.h"

tools/perf/util/header.c

@@ -42,7 +42,7 @@
 #include "tool.h"
 #include "time-utils.h"
 #include "units.h"
-#include "util.h" // page_size, perf_exe()
+#include "util/util.h" // perf_exe()
 #include "cputopo.h"
 #include "bpf-event.h"
 

tools/perf/util/machine.c

@@ -32,6 +32,7 @@
 #include "linux/hash.h"
 #include "asm/bug.h"
 #include "bpf-event.h"
+#include <internal/lib.h> // page_size
 
 #include <linux/ctype.h>
 #include <symbol/kallsyms.h>

tools/perf/util/mmap.c

@@ -20,7 +20,7 @@
 #include "event.h"
 #include "mmap.h"
 #include "../perf.h"
-#include "util.h" /* page_size */
+#include <internal/lib.h> /* page_size */
 
 size_t perf_mmap__mmap_len(struct mmap *map)
 {

tools/perf/util/python.c

@@ -14,7 +14,7 @@
 #include "thread_map.h"
 #include "trace-event.h"
 #include "mmap.h"
-#include "util.h"
+#include <internal/lib.h>
 #include "../perf-sys.h"
 
 #if PY_MAJOR_VERSION < 3

tools/perf/util/session.c

@@ -29,7 +29,6 @@
 #include "thread-stack.h"
 #include "sample-raw.h"
 #include "stat.h"
-#include "util.h"
 #include "ui/progress.h"
 #include "../perf.h"
 #include "arch/common.h"

tools/perf/util/srccode.c

@@ -15,7 +15,7 @@
 #include <string.h>
 #include "srccode.h"
 #include "debug.h"
-#include "util.h" // page_size
+#include <internal/lib.h> // page_size
 
 #define MAXSRCCACHE (32*1024*1024)
 #define MAXSRCFILES     64

tools/perf/util/synthetic-events.c

@@ -16,7 +16,6 @@
 #include "util/synthetic-events.h"
 #include "util/target.h"
 #include "util/time-utils.h"
-#include "util/util.h"
 #include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
@@ -26,6 +25,7 @@
 #include <perf/evsel.h>
 #include <internal/cpumap.h>
 #include <perf/cpumap.h>
+#include <internal/lib.h> // page_size
 #include <internal/threadmap.h>
 #include <perf/threadmap.h>
 #include <symbol/kallsyms.h>

tools/perf/util/trace-event-info.c

@@ -2,7 +2,6 @@
 /*
  * Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
  */
-#include "util.h" // page_size
 #include <dirent.h>
 #include <mntent.h>
 #include <stdio.h>
@@ -19,6 +18,7 @@
 #include <linux/list.h>
 #include <linux/kernel.h>
 #include <linux/zalloc.h>
+#include <internal/lib.h> // page_size
 
 #include "trace-event.h"
 #include <api/fs/tracing_path.h>

tools/perf/util/util.c

@@ -3,6 +3,7 @@
 #include "debug.h"
 #include "event.h"
 #include "namespaces.h"
+#include <internal/lib.h>
 #include <api/fs/fs.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ -41,8 +42,6 @@ void perf_set_multithreaded(void)
 	perf_singlethreaded = false;
 }
 
-unsigned int page_size;
-
 int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
 int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
 

tools/perf/util/util.h

@@ -33,8 +33,6 @@ int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size);
 
 size_t hex_width(u64 v);
 
-extern unsigned int page_size;
-
 int sysctl__max_stack(void);
 
 int fetch_kernel_version(unsigned int *puint,