Commit 4bcc4cff authored Dec 27, 2018 by Arnaldo Carvalho de Melo

perf trace: Store the major number for a file when storing its pathname

We keep a table for the fds to map them back to pathnames when showing
'fd' based APIs such as write(), store as well the major number for the
device the path is in, to use in things like choosing the right ioctl
'cmd' beautifier.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-qjkds7bnk7v7fk2xhqsb0a4v@git.kernel.org

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent d7e13484

tools/perf/builtin-trace.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -60,6 +60,7 @@
		#include <linux/stringify.h>
		#include <linux/time64.h>
		#include <fcntl.h>
		#include <sys/sysmacros.h>

		#include "sane_ctype.h"

		@@ -959,6 +960,7 @@ static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)

		struct file {
		char *pathname;
		int dev_maj;
		};

		/**
		@@ -1068,6 +1070,9 @@ static int trace__set_fd_pathname(struct thread thread, int fd, const char pat
		struct file *file = thread_trace__files_entry(ttrace, fd);

		if (file != NULL) {
		struct stat st;
		if (stat(pathname, &st) == 0)
		file->dev_maj = major(st.st_rdev);
		file->pathname = strdup(pathname);
		if (file->pathname)
		return 0;