perf_counter tools: Optionally pass a symbol filter to the dso load routines

Will be used by perf top.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090528175526.GF4747@ghostprotocols.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 28 insertions, 17 deletions

diff --git a/Documentation/perf_counter/builtin-report.c b/Documentation/perf_counter/builtin-report.c
index 4e9f2bc10452..412d524dd658 100644
--- a/Documentation/perf_counter/builtin-report.c
+++ b/Documentation/perf_counter/builtin-report.c
@@ -87,7 +87,7 @@ static struct dso *dsos__findnew(const char *name)
                 if (!dso)
                         goto out_delete_dso;
 
-                nr = dso__load(dso);
+                nr = dso__load(dso, NULL);
                 if (nr < 0) {
                         fprintf(stderr, "Failed to open: %s\n", name);
                         goto out_delete_dso;
@@ -124,7 +124,7 @@ static int load_kernel(void)
         if (!kernel_dso)
                 return -1;
 
-        err = dso__load_kernel(kernel_dso, vmlinux);
+        err = dso__load_kernel(kernel_dso, vmlinux, NULL);
         if (err) {
                 dso__delete(kernel_dso);
                 kernel_dso = NULL;
diff --git a/Documentation/perf_counter/util/symbol.c b/Documentation/perf_counter/util/symbol.c
index 504ac3132019..47281210443d 100644
--- a/Documentation/perf_counter/util/symbol.c
+++ b/Documentation/perf_counter/util/symbol.c
@@ -155,7 +155,7 @@ static int hex2long(char *ptr, unsigned long *long_val)
         return p - ptr;
 }
 
-static int dso__load_kallsyms(struct dso *self)
+static int dso__load_kallsyms(struct dso *self, symbol_filter_t filter)
 {
         struct rb_node *nd, *prevnd;
         char *line = NULL;
@@ -201,7 +201,10 @@ static int dso__load_kallsyms(struct dso *self)
                 if (sym == NULL)
                         goto out_delete_line;
 
-                dso__insert_symbol(self, sym);
+                if (filter && filter(self, sym))
+                        symbol__delete(sym, self->sym_priv_size);
+                else
+                        dso__insert_symbol(self, sym);
         }
 
         /*
@@ -286,7 +289,8 @@ static Elf_Scn *elf_section_by_name(Elf *elf, GElf_Ehdr *ep,
         return sec;
 }
 
-static int dso__load_sym(struct dso *self, int fd, const char *name)
+static int dso__load_sym(struct dso *self, int fd, const char *name,
+                         symbol_filter_t filter)
 {
         Elf_Data *symstrs;
         uint32_t nr_syms;
@@ -352,9 +356,12 @@ static int dso__load_sym(struct dso *self, int fd, const char *name)
                 if (!f)
                         goto out_elf_end;
 
-                dso__insert_symbol(self, f);
-
-                nr++;
+                if (filter && filter(self, f))
+                        symbol__delete(f, self->sym_priv_size);
+                else {
+                        dso__insert_symbol(self, f);
+                        nr++;
+                }
         }
 
         err = nr;
@@ -364,7 +371,7 @@ out_close:
         return err;
 }
 
-int dso__load(struct dso *self)
+int dso__load(struct dso *self, symbol_filter_t filter)
 {
         int size = strlen(self->name) + sizeof("/usr/lib/debug%s.debug");
         char *name = malloc(size);
@@ -396,7 +403,7 @@ more:
                 fd = open(name, O_RDONLY);
         } while (fd < 0);
 
-        ret = dso__load_sym(self, fd, name);
+        ret = dso__load_sym(self, fd, name, filter);
         close(fd);
 
         /*
@@ -410,28 +417,29 @@ out:
         return ret;
 }
 
-static int dso__load_vmlinux(struct dso *self, const char *vmlinux)
+static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
+                             symbol_filter_t filter)
 {
         int err, fd = open(vmlinux, O_RDONLY);
 
         if (fd < 0)
                 return -1;
 
-        err = dso__load_sym(self, fd, vmlinux);
+        err = dso__load_sym(self, fd, vmlinux, filter);
         close(fd);
 
         return err;
 }
 
-int dso__load_kernel(struct dso *self, const char *vmlinux)
+int dso__load_kernel(struct dso *self, const char *vmlinux, symbol_filter_t filter)
 {
         int err = -1;
 
         if (vmlinux)
-                err = dso__load_vmlinux(self, vmlinux);
+                err = dso__load_vmlinux(self, vmlinux, filter);
 
         if (err)
-                err = dso__load_kallsyms(self);
+                err = dso__load_kallsyms(self, filter);
 
         return err;
 }
diff --git a/Documentation/perf_counter/util/symbol.h b/Documentation/perf_counter/util/symbol.h
index db2fdf9f70a2..b0299bc0cf50 100644
--- a/Documentation/perf_counter/util/symbol.h
+++ b/Documentation/perf_counter/util/symbol.h
@@ -19,6 +19,8 @@ struct dso {
         char             name[0];
 };
 
+typedef int (*symbol_filter_t)(struct dso *self, struct symbol *sym);
+
 struct dso *dso__new(const char *name, unsigned int sym_priv_size);
 void dso__delete(struct dso *self);
 
@@ -29,8 +31,9 @@ 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);
-int dso__load(struct dso *self);
+int dso__load_kernel(struct dso *self, const char *vmlinux,
+                     symbol_filter_t filter);
+int dso__load(struct dso *self, symbol_filter_t filter);
 
 size_t dso__fprintf(struct dso *self, FILE *fp);