perf_counter tools: Print out symbol parsing errors only if --verbose

Also, add a suggestion to 'perf report', if the default sort order is
used.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

4 files changed, 32 insertions, 19 deletions

diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index 56c664d1b628..15fe9dae792b 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -26,7 +26,10 @@
 
 static char             const *input_name = "perf.data";
 static char             *vmlinux = NULL;
-static char             *sort_order = "comm,dso";
+
+static char             default_sort_order[] = "comm,dso";
+static char             *sort_order = default_sort_order;
+
 static int              input;
 static int              show_mask = SHOW_KERNEL | SHOW_USER | SHOW_HV;
 
@@ -103,9 +106,10 @@ static struct dso *dsos__findnew(const char *name)
         if (!dso)
                 goto out_delete_dso;
 
-        nr = dso__load(dso, NULL);
+        nr = dso__load(dso, NULL, verbose);
         if (nr < 0) {
-                fprintf(stderr, "Failed to open: %s\n", name);
+                if (verbose)
+                        fprintf(stderr, "Failed to open: %s\n", name);
                 goto out_delete_dso;
         }
         if (!nr && verbose) {
@@ -139,7 +143,7 @@ static int load_kernel(void)
         if (!kernel_dso)
                 return -1;
 
-        err = dso__load_kernel(kernel_dso, vmlinux, NULL);
+        err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose);
         if (err) {
                 dso__delete(kernel_dso);
                 kernel_dso = NULL;
@@ -741,6 +745,12 @@ static size_t output__fprintf(FILE *fp, uint64_t total_samples)
                 ret += hist_entry__fprintf(fp, pos, total_samples);
         }
 
+        if (!strcmp(sort_order, default_sort_order)) {
+                fprintf(fp, "#\n");
+                fprintf(fp, "# ( For more details, try: perf report --sort comm,dso,symbol )\n");
+                fprintf(fp, "#\n");
+        }
+
         return ret;
 }
 
diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
index 3f7778ba00bc..548a8da4b15b 100644
--- a/Documentation/perf_counter/builtin-top.c
+++ b/Documentation/perf_counter/builtin-top.c
@@ -349,7 +349,7 @@ static int parse_symbols(void)
         if (kernel_dso == NULL)
                 return -1;
 
-        if (dso__load_kernel(kernel_dso, NULL, symbol_filter) != 0)
+        if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1) != 0)
                 goto out_delete_dso;
 
         node = rb_first(&kernel_dso->syms);
diff --git a/Documentation/perf_counter/util/symbol.c b/Documentation/perf_counter/util/symbol.c
index 35ee6de1e513..15d5cf9abfac 100644
--- a/Documentation/perf_counter/util/symbol.c
+++ b/Documentation/perf_counter/util/symbol.c
@@ -124,7 +124,7 @@ size_t dso__fprintf(struct dso *self, FILE *fp)
         return ret;
 }
 
-static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter)
+static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter, int verbose)
 {
         struct rb_node *nd, *prevnd;
         char *line = NULL;
@@ -370,7 +370,7 @@ static int dso__synthesize_plt_symbols(struct  dso *self, Elf *elf,
 }
 
 static int dso__load_sym(struct dso *self, int fd, const char *name,
-                         symbol_filter_t filter)
+                         symbol_filter_t filter, int verbose)
 {
         Elf_Data *symstrs;
         uint32_t nr_syms;
@@ -387,13 +387,15 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
 
         elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
         if (elf == NULL) {
-                fprintf(stderr, "%s: cannot read %s ELF file.\n",
-                        __func__, name);
+                if (verbose)
+                        fprintf(stderr, "%s: cannot read %s ELF file.\n",
+                                __func__, name);
                 goto out_close;
         }
 
         if (gelf_getehdr(elf, &ehdr) == NULL) {
-                fprintf(stderr, "%s: cannot get elf header.\n", __func__);
+                if (verbose)
+                        fprintf(stderr, "%s: cannot get elf header.\n", __func__);
                 goto out_elf_end;
         }
 
@@ -473,7 +475,7 @@ out_close:
         return err;
 }
 
-int dso__load(struct dso *self, symbol_filter_t filter)
+int dso__load(struct dso *self, symbol_filter_t filter, int verbose)
 {
         int size = strlen(self->name) + sizeof("/usr/lib/debug%s.debug");
         char *name = malloc(size);
@@ -505,7 +507,7 @@ more:
                 fd = open(name, O_RDONLY);
         } while (fd < 0);
 
-        ret = dso__load_sym(self, fd, name, filter);
+        ret = dso__load_sym(self, fd, name, filter, verbose);
         close(fd);
 
         /*
@@ -520,28 +522,29 @@ out:
 }
 
 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
-                             symbol_filter_t filter)
+                             symbol_filter_t filter, int verbose)
 {
         int err, fd = open(vmlinux, O_RDONLY);
 
         if (fd < 0)
                 return -1;
 
-        err = dso__load_sym(self, fd, vmlinux, filter);
+        err = dso__load_sym(self, fd, vmlinux, filter, verbose);
         close(fd);
 
         return err;
 }
 
-int dso__load_kernel(struct dso *self, const char *vmlinux, symbol_filter_t filter)
+int dso__load_kernel(struct dso *self, const char *vmlinux,
+                     symbol_filter_t filter, int verbose)
 {
         int err = -1;
 
         if (vmlinux)
-                err = dso__load_vmlinux(self, vmlinux, filter);
+                err = dso__load_vmlinux(self, vmlinux, filter, verbose);
 
         if (err)
-                err = dso__load_kallsyms(self, filter);
+                err = dso__load_kallsyms(self, filter, verbose);
 
         return err;
 }
diff --git a/Documentation/perf_counter/util/symbol.h b/Documentation/perf_counter/util/symbol.h
index b0299bc0cf50..8dd8522a0a0c 100644
--- a/Documentation/perf_counter/util/symbol.h
+++ b/Documentation/perf_counter/util/symbol.h
@@ -32,8 +32,8 @@ static inline void *dso__sym_priv(struct dso *self, struct symbol *sym)
 struct symbol *dso__find_symbol(struct dso *self, uint64_t ip);
 
 int dso__load_kernel(struct dso *self, const char *vmlinux,
-                     symbol_filter_t filter);
-int dso__load(struct dso *self, symbol_filter_t filter);
+                     symbol_filter_t filter, int verbose);
+int dso__load(struct dso *self, symbol_filter_t filter, int verbose);
 
 size_t dso__fprintf(struct dso *self, FILE *fp);