perf kvm: Move code to generate filename for perf-kvm to function.

The code in builtin-kvm.c to generate filename for perf-kvm is useful to
other command such as builtin-diff.

This patch move the related code form builtin-kvm.c to util/util.c and
wrap them in a function named get_filename_for_perf_kvm.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Link: http://lkml.kernel.org/r/5e09a5c47e8a495e888cbdc65a6fafb2c950f529.1386368672.git.yangds.fnst@cn.fujitsu.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index c2e5d56..c6fa3cb 100644 (file)
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1713,12 +1713,7 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
                perf_guest = 1;
 
        if (!file_name) {
-               if (perf_host && !perf_guest)
-                       file_name = strdup("perf.data.host");
-               else if (!perf_host && perf_guest)
-                       file_name = strdup("perf.data.guest");
-               else
-                       file_name = strdup("perf.data.kvm");
+               file_name = get_filename_for_perf_kvm();
 
                if (!file_name) {
                        pr_err("Failed to allocate memory for filename\n");

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index bae8756..4a57609 100644 (file)
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -482,3 +482,17 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep)
        close(fd);
        return err;
 }
+
+const char *get_filename_for_perf_kvm(void)
+{
+       const char *filename;
+
+       if (perf_host && !perf_guest)
+               filename = strdup("perf.data.host");
+       else if (!perf_host && perf_guest)
+               filename = strdup("perf.data.guest");
+       else
+               filename = strdup("perf.data.kvm");
+
+       return filename;
+}

diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 659abf3..0171213 100644 (file)
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -321,4 +321,6 @@ void free_srcline(char *srcline);
 
 int filename__read_int(const char *filename, int *value);
 int filename__read_str(const char *filename, char **buf, size_t *sizep);
+
+const char *get_filename_for_perf_kvm(void);
 #endif /* GIT_COMPAT_UTIL_H */