perf tools: Have the page size value available for all tools

Its such a common need that we might as well have a global with that
value.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-mwfqji9f17k5j81l1404dk3q@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-test.c

@@ -35,7 +35,6 @@ static int test__vmlinux_matches_kallsyms(void)
 	struct map *kallsyms_map, *vmlinux_map;
 	struct machine kallsyms, vmlinux;
 	enum map_type type = MAP__FUNCTION;
-	long page_size = sysconf(_SC_PAGE_SIZE);
 	struct ref_reloc_sym ref_reloc_sym = { .name = "_stext", };
 
 	/*
@@ -1007,7 +1006,6 @@ static void segfault_handler(int sig __maybe_unused,
 
 static int __test__rdpmc(void)
 {
-	long page_size = sysconf(_SC_PAGE_SIZE);
 	volatile int tmp = 0;
 	u64 i, loops = 1000;
 	int n;

tools/perf/perf.c

@@ -440,6 +440,8 @@ int main(int argc, const char **argv)
 {
 	const char *cmd;
 
+	page_size = sysconf(_SC_PAGE_SIZE);
+
 	cmd = perf_extract_argv0_path(argv[0]);
 	if (!cmd)
 		cmd = "perf-help";

tools/perf/util/evlist.c

@@ -325,8 +325,6 @@ struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
 
 union perf_event *perf_evlist__mmap_read(struct perf_evlist *evlist, int idx)
 {
-	/* XXX Move this to perf.c, making it generally available */
-	unsigned int page_size = sysconf(_SC_PAGE_SIZE);
 	struct perf_mmap *md = &evlist->mmap[idx];
 	unsigned int head = perf_mmap__read_head(md);
 	unsigned int old = md->prev;
@@ -528,7 +526,6 @@ static int perf_evlist__mmap_per_thread(struct perf_evlist *evlist, int prot, in
 int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
 		      bool overwrite)
 {
-	unsigned int page_size = sysconf(_SC_PAGE_SIZE);
 	struct perf_evsel *evsel;
 	const struct cpu_map *cpus = evlist->cpus;
 	const struct thread_map *threads = evlist->threads;

tools/perf/util/session.c

@@ -1375,15 +1375,13 @@ int __perf_session__process_events(struct perf_session *session,
 {
 	u64 head, page_offset, file_offset, file_pos, progress_next;
 	int err, mmap_prot, mmap_flags, map_idx = 0;
-	size_t	page_size, mmap_size;
+	size_t	mmap_size;
 	char *buf, *mmaps[8];
 	union perf_event *event;
 	uint32_t size;
 
 	perf_tool__fill_defaults(tool);
 
-	page_size = sysconf(_SC_PAGESIZE);
-
 	page_offset = page_size * (data_offset / page_size);
 	file_offset = page_offset;
 	head = data_offset - page_offset;

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

@@ -47,8 +47,6 @@ int file_bigendian;
 int host_bigendian;
 static int long_size;
 
-static unsigned long	page_size;
-
 static ssize_t calc_data_size;
 static bool repipe;
 

tools/perf/util/util.c

@@ -10,6 +10,8 @@
 /*
  * XXX We need to find a better place for these things...
  */
+unsigned int page_size;
+
 bool perf_host  = true;
 bool perf_guest = false;
 

tools/perf/util/util.h

@@ -263,4 +263,6 @@ char *rtrim(char *s);
 
 void dump_stack(void);
 
+extern unsigned int page_size;
+
 #endif