19 files changed, 51 insertions, 33 deletions

diff --git a/tools/perf/Documentation/perf-annotate.txt b/tools/perf/Documentation/perf-annotate.txt
index 476029d30621..c89f9e1453f7 100644
--- a/tools/perf/Documentation/perf-annotate.txt
+++ b/tools/perf/Documentation/perf-annotate.txt
@@ -22,7 +22,7 @@ OPTIONS
 -------
 -i::
 --input=::
-        Input file name. (default: perf.data)
+        Input file name. (default: perf.data unless stdin is a fifo)
 
 -d::
 --dsos=<dso[,dso...]>::
diff --git a/tools/perf/Documentation/perf-buildid-list.txt b/tools/perf/Documentation/perf-buildid-list.txt
index cc22325ffd1b..25c52efcc7f0 100644
--- a/tools/perf/Documentation/perf-buildid-list.txt
+++ b/tools/perf/Documentation/perf-buildid-list.txt
@@ -26,7 +26,7 @@ OPTIONS
         Show only DSOs with hits.
 -i::
 --input=::
-        Input file name. (default: perf.data)
+        Input file name. (default: perf.data unless stdin is a fifo)
 -f::
 --force::
         Don't do ownership validation.
diff --git a/tools/perf/Documentation/perf-evlist.txt b/tools/perf/Documentation/perf-evlist.txt
index 0cada9e053dc..0507ec7bad71 100644
--- a/tools/perf/Documentation/perf-evlist.txt
+++ b/tools/perf/Documentation/perf-evlist.txt
@@ -18,7 +18,7 @@ OPTIONS
 -------
 -i::
 --input=::
-        Input file name. (default: perf.data)
+        Input file name. (default: perf.data unless stdin is a fifo)
 
 SEE ALSO
 --------
diff --git a/tools/perf/Documentation/perf-kmem.txt b/tools/perf/Documentation/perf-kmem.txt
index a52fcde894c7..7c8fbbf3f61c 100644
--- a/tools/perf/Documentation/perf-kmem.txt
+++ b/tools/perf/Documentation/perf-kmem.txt
@@ -23,7 +23,7 @@ OPTIONS
 -------
 -i <file>::
 --input=<file>::
-        Select the input file (default: perf.data)
+        Select the input file (default: perf.data unless stdin is a fifo)
 
 --caller::
         Show per-callsite statistics
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
index 4a26a2f3a6a3..d6b2a4f2108b 100644
--- a/tools/perf/Documentation/perf-lock.txt
+++ b/tools/perf/Documentation/perf-lock.txt
@@ -29,7 +29,7 @@ COMMON OPTIONS
 
 -i::
 --input=<file>::
-        Input file name.
+        Input file name. (default: perf.data unless stdin is a fifo)
 
 -v::
 --verbose::
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 35af0dc8ccb4..9b430e98712e 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -19,7 +19,7 @@ OPTIONS
 -------
 -i::
 --input=::
-        Input file name. (default: perf.data)
+        Input file name. (default: perf.data unless stdin is a fifo)
 
 -v::
 --verbose::
diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt
index 5b212b57f70b..8ff4df956951 100644
--- a/tools/perf/Documentation/perf-sched.txt
+++ b/tools/perf/Documentation/perf-sched.txt
@@ -40,7 +40,7 @@ OPTIONS
 -------
 -i::
 --input=<file>::
-        Input file name. (default: perf.data)
+        Input file name. (default: perf.data unless stdin is a fifo)
 
 -v::
 --verbose::
diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 7f61eaaf9ab8..2f6cef43da25 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -106,7 +106,7 @@ OPTIONS
 
 -i::
 --input=::
-        Input file name.
+        Input file name. (default: perf.data unless stdin is a fifo)
 
 -d::
 --debug-mode::
diff --git a/tools/perf/Documentation/perf-timechart.txt b/tools/perf/Documentation/perf-timechart.txt
index d7b79e2ba2ad..1632b0efc757 100644
--- a/tools/perf/Documentation/perf-timechart.txt
+++ b/tools/perf/Documentation/perf-timechart.txt
@@ -27,7 +27,7 @@ OPTIONS
         Select the output file (default: output.svg)
 -i::
 --input=::
-        Select the input file (default: perf.data)
+        Select the input file (default: perf.data unless stdin is a fifo)
 -w::
 --width=::
         Select the width of the SVG file (default: 1000)
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index d449645c5ef1..214ba7f9f577 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -215,7 +215,7 @@ static int __cmd_annotate(struct perf_annotate *ann)
         }
 
         if (total_nr_samples == 0) {
-                ui__warning("The %s file has no samples!\n", ann->input_name);
+                ui__warning("The %s file has no samples!\n", session->filename);
                 goto out_delete;
         }
 out_delete:
@@ -250,7 +250,6 @@ int cmd_annotate(int argc, const char **argv, const char *prefix __used)
                         .ordered_samples = true,
                         .ordering_requires_timestamps = true,
                 },
-                .input_name = "perf.data",
         };
         const struct option options[] = {
         OPT_STRING('i', "input", &annotate.input_name, "file",
diff --git a/tools/perf/builtin-buildid-list.c b/tools/perf/builtin-buildid-list.c
index 4895668577b5..52480467e9ff 100644
--- a/tools/perf/builtin-buildid-list.c
+++ b/tools/perf/builtin-buildid-list.c
@@ -18,7 +18,7 @@
 
 #include <libelf.h>
 
-static char const *input_name = "perf.data";
+static const char *input_name;
 static bool force;
 static bool show_kernel;
 static bool with_hits;
@@ -71,16 +71,24 @@ static int perf_session__list_build_ids(void)
 {
         struct perf_session *session;
 
+        elf_version(EV_CURRENT);
+
         session = perf_session__new(input_name, O_RDONLY, force, false,
                                     &build_id__mark_dso_hit_ops);
         if (session == NULL)
                 return -1;
 
+        /*
+         * See if this is an ELF file first:
+         */
+        if (filename__fprintf_build_id(session->filename, stdout))
+                goto out;
+
         if (with_hits)
                 perf_session__process_events(session, &build_id__mark_dso_hit_ops);
 
         perf_session__fprintf_dsos_buildid(session, stdout, with_hits);
-
+out:
         perf_session__delete(session);
         return 0;
 }
@@ -90,13 +98,6 @@ static int __cmd_buildid_list(void)
         if (show_kernel)
                 return sysfs__fprintf_build_id(stdout);
 
-        elf_version(EV_CURRENT);
-        /*
-         * See if this is an ELF file first:
-         */
-        if (filename__fprintf_build_id(input_name, stdout))
-                return 0;
-
         return perf_session__list_build_ids();
 }
 
diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
index 4c5e9e04a41f..26760322c4f4 100644
--- a/tools/perf/builtin-evlist.c
+++ b/tools/perf/builtin-evlist.c
@@ -15,7 +15,7 @@
 #include "util/parse-options.h"
 #include "util/session.h"
 
-static char const *input_name = "perf.data";
+static const char *input_name;
 
 static int __cmd_evlist(void)
 {
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 886174e9525b..fe1ad8f21961 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -19,7 +19,7 @@
 struct alloc_stat;
 typedef int (*sort_fn_t)(struct alloc_stat *, struct alloc_stat *);
 
-static char const               *input_name = "perf.data";
+static const char               *input_name;
 
 static int                      alloc_flag;
 static int                      caller_flag;
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 4db5e5293067..2296c391d0f5 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -326,7 +326,7 @@ alloc_failed:
         die("memory allocation failed\n");
 }
 
-static char                     const *input_name = "perf.data";
+static const char *input_name;
 
 struct raw_event_sample {
         u32                     size;
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 9051f6bfaa7e..25d34d483e49 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -321,8 +321,7 @@ static int __cmd_report(struct perf_report *rep)
         }
 
         if (nr_samples == 0) {
-                ui__warning("The %s file has no samples!\n",
-                            rep->input_name);
+                ui__warning("The %s file has no samples!\n", session->filename);
                 goto out_delete;
         }
 
@@ -430,6 +429,7 @@ setup:
 
 int cmd_report(int argc, const char **argv, const char *prefix __used)
 {
+        struct stat st;
         char callchain_default_opt[] = "fractal,0.5,callee";
         const char * const report_usage[] = {
                 "perf report [<options>]",
@@ -451,7 +451,6 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
                         .ordered_samples = true,
                         .ordering_requires_timestamps = true,
                 },
-                .input_name              = "perf.data",
                 .pretty_printing_style   = "normal",
         };
         const struct option options[] = {
@@ -531,10 +530,18 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
         if (report.inverted_callchain)
                 callchain_param.order = ORDER_CALLER;
 
+        if (!report.input_name || !strlen(report.input_name)) {
+                if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
+                        report.input_name = "-";
+                else
+                        report.input_name = "perf.data";
+        }
+
         if (strcmp(report.input_name, "-") != 0)
                 setup_browser(true);
         else
                 use_browser = 0;
+
         /*
          * Only in the newt browser we are doing integrated annotation,
          * so don't allocate extra space that won't be used in the stdio
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 6284ed2317f2..fb8b5f83b4a0 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -22,7 +22,7 @@
 #include <pthread.h>
 #include <math.h>
 
-static char                     const *input_name = "perf.data";
+static const char               *input_name;
 
 static char                     default_sort_order[] = "avg, max, switch, runtime";
 static const char               *sort_order = default_sort_order;
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index d71b745da06e..3d4c0c7b576e 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -434,7 +434,7 @@ static int cleanup_scripting(void)
         return scripting_ops->stop_script();
 }
 
-static char const               *input_name = "perf.data";
+static const char *input_name;
 
 static int process_sample_event(struct perf_tool *tool __used,
                                 union perf_event *event,
@@ -1316,7 +1316,7 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
                         return -1;
                 }
 
-                input = open(input_name, O_RDONLY);
+                input = open(session->filename, O_RDONLY);      /* input_name */
                 if (input < 0) {
                         perror("failed to open file");
                         exit(-1);
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 135376a37f97..3b75b2e21ea5 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -38,8 +38,8 @@
 #define PWR_EVENT_EXIT -1
 
 
-static char             const *input_name = "perf.data";
-static char             const *output_name = "output.svg";
+static const char       *input_name;
+static const char       *output_name = "output.svg";
 
 static unsigned int     numcpus;
 static u64              min_freq;       /* Lowest CPU frequency seen */
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index ea17dfb85baa..cc5e6be46d86 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -107,8 +107,19 @@ struct perf_session *perf_session__new(const char *filename, int mode,
                                        bool force, bool repipe,
                                        struct perf_tool *tool)
 {
-        size_t len = filename ? strlen(filename) : 0;
-        struct perf_session *self = zalloc(sizeof(*self) + len);
+        struct perf_session *self;
+        struct stat st;
+        size_t len;
+
+        if (!filename || !strlen(filename)) {
+                if (!fstat(STDIN_FILENO, &st) && S_ISFIFO(st.st_mode))
+                        filename = "-";
+                else
+                        filename = "perf.data";
+        }
+
+        len = strlen(filename);
+        self = zalloc(sizeof(*self) + len);
 
         if (self == NULL)
                 goto out;