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Subject[tip:perf/urgent] perf data: Support having perf.data stored as a directory
Commit-ID:  ec65def1045e4c7817b7f741a86dadae82877a93
Gitweb: https://git.kernel.org/tip/ec65def1045e4c7817b7f741a86dadae82877a93
Author: Jiri Olsa <jolsa@kernel.org>
AuthorDate: Fri, 8 Mar 2019 14:47:35 +0100
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 11 Mar 2019 11:56:03 -0300

perf data: Support having perf.data stored as a directory

The caller needs to set 'struct perf_data::is_dir flag and the path will
be treated as a directory.

The 'struct perf_data::file' is initialized and open as 'path/header'
file.

Add a check to the direcory interface functions to check the is_dir flag.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20190308134745.5057-2-jolsa@kernel.org
[ Be consistent on how to signal failure, i.e. use -1 and let users check errno ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/data.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++-
tools/perf/util/data.h | 6 ++++++
tools/perf/util/session.c | 4 ++++
3 files changed, 58 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index e098e189f93e..18fa8d4614eb 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -34,6 +34,9 @@ int perf_data__create_dir(struct perf_data *data, int nr)
struct perf_data_file *files = NULL;
int i, ret = -1;

+ if (WARN_ON(!data->is_dir))
+ return -EINVAL;
+
files = zalloc(nr * sizeof(*files));
if (!files)
return -ENOMEM;
@@ -69,6 +72,9 @@ int perf_data__open_dir(struct perf_data *data)
DIR *dir;
int nr = 0;

+ if (WARN_ON(!data->is_dir))
+ return -EINVAL;
+
dir = opendir(data->path);
if (!dir)
return -EINVAL;
@@ -173,6 +179,16 @@ static int check_backup(struct perf_data *data)
return 0;
}

+static bool is_dir(struct perf_data *data)
+{
+ struct stat st;
+
+ if (stat(data->path, &st))
+ return false;
+
+ return (st.st_mode & S_IFMT) == S_IFDIR;
+}
+
static int open_file_read(struct perf_data *data)
{
struct stat st;
@@ -254,6 +270,30 @@ static int open_file_dup(struct perf_data *data)
return open_file(data);
}

+static int open_dir(struct perf_data *data)
+{
+ int ret;
+
+ /*
+ * So far we open only the header, so we can read the data version and
+ * layout.
+ */
+ if (asprintf(&data->file.path, "%s/header", data->path) < 0)
+ return -1;
+
+ if (perf_data__is_write(data) &&
+ mkdir(data->path, S_IRWXU) < 0)
+ return -1;
+
+ ret = open_file(data);
+
+ /* Cleanup whatever we managed to create so far. */
+ if (ret && perf_data__is_write(data))
+ rm_rf_perf_data(data->path);
+
+ return ret;
+}
+
int perf_data__open(struct perf_data *data)
{
if (check_pipe(data))
@@ -265,11 +305,18 @@ int perf_data__open(struct perf_data *data)
if (check_backup(data))
return -1;

- return open_file_dup(data);
+ if (perf_data__is_read(data))
+ data->is_dir = is_dir(data);
+
+ return perf_data__is_dir(data) ?
+ open_dir(data) : open_file_dup(data);
}

void perf_data__close(struct perf_data *data)
{
+ if (perf_data__is_dir(data))
+ perf_data__close_dir(data);
+
zfree(&data->file.path);
close(data->file.fd);
}
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 14b47be2bd69..06aefeda311f 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -19,6 +19,7 @@ struct perf_data {
const char *path;
struct perf_data_file file;
bool is_pipe;
+ bool is_dir;
bool force;
enum perf_data_mode mode;

@@ -43,6 +44,11 @@ static inline int perf_data__is_pipe(struct perf_data *data)
return data->is_pipe;
}

+static inline bool perf_data__is_dir(struct perf_data *data)
+{
+ return data->is_dir;
+}
+
static inline int perf_data__fd(struct perf_data *data)
{
return data->file.fd;
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index db643f3c2b95..de777bdc0ed3 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -152,6 +152,10 @@ struct perf_session *perf_session__new(struct perf_data *data,
}

perf_evlist__init_trace_event_sample_raw(session->evlist);
+
+ /* Open the directory data. */
+ if (data->is_dir && perf_data__open_dir(data))
+ goto out_delete;
}
} else {
session->machines.host.env = &perf_env;
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