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authorWang Nan <wangnan0@huawei.com>2016-04-13 08:21:05 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-04-14 08:57:54 -0300
commit040f9915e99e604688c2880e0b1e5b59dbfefa54 (patch)
tree6858dd65055154cea586357070020614c75333e7 /tools/perf/util
parentb26dc73018d2e3a68cad0cf0bad902a8637f9bdf (diff)
perf data: Add perf_data_file__switch() helper
perf_data_file__switch() closes current output file, renames it, then open a new one to continue recording. It will be used by 'perf record' to split output into multiple perf.data files. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1460535673-159866-3-git-send-email-wangnan0@huawei.com Signed-off-by: He Kuang <hekuang@huawei.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util')
-rw-r--r--tools/perf/util/data.c41
-rw-r--r--tools/perf/util/data.h11
2 files changed, 51 insertions, 1 deletions
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 1921942fc2e0..be83516155ee 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -136,3 +136,44 @@ ssize_t perf_data_file__write(struct perf_data_file *file,
{
return writen(file->fd, buf, size);
}
+
+int perf_data_file__switch(struct perf_data_file *file,
+ const char *postfix,
+ size_t pos, bool at_exit)
+{
+ char *new_filepath;
+ int ret;
+
+ if (check_pipe(file))
+ return -EINVAL;
+ if (perf_data_file__is_read(file))
+ return -EINVAL;
+
+ if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0)
+ return -ENOMEM;
+
+ /*
+ * Only fire a warning, don't return error, continue fill
+ * original file.
+ */
+ if (rename(file->path, new_filepath))
+ pr_warning("Failed to rename %s to %s\n", file->path, new_filepath);
+
+ if (!at_exit) {
+ close(file->fd);
+ ret = perf_data_file__open(file);
+ if (ret < 0)
+ goto out;
+
+ if (lseek(file->fd, pos, SEEK_SET) == (off_t)-1) {
+ ret = -errno;
+ pr_debug("Failed to lseek to %zu: %s",
+ pos, strerror(errno));
+ goto out;
+ }
+ }
+ ret = file->fd;
+out:
+ free(new_filepath);
+ return ret;
+}
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 2b15d0c95c7f..ae510ce16cb1 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -46,5 +46,14 @@ int perf_data_file__open(struct perf_data_file *file);
void perf_data_file__close(struct perf_data_file *file);
ssize_t perf_data_file__write(struct perf_data_file *file,
void *buf, size_t size);
-
+/*
+ * If at_exit is set, only rename current perf.data to
+ * perf.data.<postfix>, continue write on original file.
+ * Set at_exit when flushing the last output.
+ *
+ * Return value is fd of new output.
+ */
+int perf_data_file__switch(struct perf_data_file *file,
+ const char *postfix,
+ size_t pos, bool at_exit);
#endif /* __PERF_DATA_H */