perf_counter tools: Connect module support infrastructure to symbol loading infrastru...
Mike Galbraith [Thu, 2 Jul 2009 06:08:36 +0000 (08:08 +0200)]
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246514916.13293.46.camel@marge.simson.net>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/builtin-annotate.c
tools/perf/builtin-report.c
tools/perf/builtin-top.c
tools/perf/util/symbol.c
tools/perf/util/symbol.h

index 3becc8a..8820568 100644 (file)
@@ -171,7 +171,7 @@ static int load_kernel(void)
        if (!kernel_dso)
                return -1;
 
-       err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose);
+       err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose, 0);
        if (err <= 0) {
                dso__delete(kernel_dso);
                kernel_dso = NULL;
index 58d1612..38d136f 100644 (file)
@@ -188,7 +188,7 @@ static int load_kernel(void)
        if (!kernel_dso)
                return -1;
 
-       err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose);
+       err = dso__load_kernel(kernel_dso, vmlinux, NULL, verbose, 0);
        if (err <= 0) {
                dso__delete(kernel_dso);
                kernel_dso = NULL;
index 97fde1d..9bb25fc 100644 (file)
@@ -364,7 +364,7 @@ static int parse_symbols(void)
        if (kernel_dso == NULL)
                return -1;
 
-       if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1) <= 0)
+       if (dso__load_kernel(kernel_dso, NULL, symbol_filter, 1, 0) <= 0)
                goto out_delete_dso;
 
        node = rb_first(&kernel_dso->syms);
index c077b6a..98a1311 100644 (file)
@@ -35,7 +35,7 @@ static struct symbol *symbol__new(u64 start, u64 len,
                self = ((void *)self) + priv_size;
        }
        self->start = start;
-       self->end   = start + len - 1;
+       self->end   = len ? start + len - 1 : start;
        memcpy(self->name, name, namelen);
 
        return self;
@@ -48,8 +48,12 @@ static void symbol__delete(struct symbol *self, unsigned int priv_size)
 
 static size_t symbol__fprintf(struct symbol *self, FILE *fp)
 {
-       return fprintf(fp, " %llx-%llx %s\n",
+       if (!self->module)
+               return fprintf(fp, " %llx-%llx %s\n",
                       self->start, self->end, self->name);
+       else
+               return fprintf(fp, " %llx-%llx %s \t[%s]\n",
+                      self->start, self->end, self->name, self->module->name);
 }
 
 struct dso *dso__new(const char *name, unsigned int sym_priv_size)
@@ -310,6 +314,26 @@ static inline int elf_sym__is_function(const GElf_Sym *sym)
               sym->st_size != 0;
 }
 
+static inline int elf_sym__is_label(const GElf_Sym *sym)
+{
+       return elf_sym__type(sym) == STT_NOTYPE &&
+               sym->st_name != 0 &&
+               sym->st_shndx != SHN_UNDEF &&
+               sym->st_shndx != SHN_ABS;
+}
+
+static inline const char *elf_sec__name(const GElf_Shdr *shdr,
+                                       const Elf_Data *secstrs)
+{
+       return secstrs->d_buf + shdr->sh_name;
+}
+
+static inline int elf_sec__is_text(const GElf_Shdr *shdr,
+                                       const Elf_Data *secstrs)
+{
+       return strstr(elf_sec__name(shdr, secstrs), "text") != NULL;
+}
+
 static inline const char *elf_sym__name(const GElf_Sym *sym,
                                        const Elf_Data *symstrs)
 {
@@ -451,9 +475,9 @@ 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, int verbose)
+                        symbol_filter_t filter, int verbose, struct module *mod)
 {
-       Elf_Data *symstrs;
+       Elf_Data *symstrs, *secstrs;
        uint32_t nr_syms;
        int err = -1;
        uint32_t index;
@@ -461,7 +485,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
        GElf_Shdr shdr;
        Elf_Data *syms;
        GElf_Sym sym;
-       Elf_Scn *sec, *sec_dynsym;
+       Elf_Scn *sec, *sec_dynsym, *sec_strndx;
        Elf *elf;
        size_t dynsym_idx;
        int nr = 0;
@@ -520,6 +544,14 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
        if (symstrs == NULL)
                goto out_elf_end;
 
+       sec_strndx = elf_getscn(elf, ehdr.e_shstrndx);
+       if (sec_strndx == NULL)
+               goto out_elf_end;
+
+       secstrs = elf_getdata(sec_strndx, NULL);
+       if (symstrs == NULL)
+               goto out_elf_end;
+
        nr_syms = shdr.sh_size / shdr.sh_entsize;
 
        memset(&sym, 0, sizeof(sym));
@@ -529,8 +561,11 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
        elf_symtab__for_each_symbol(syms, nr_syms, index, sym) {
                struct symbol *f;
                u64 obj_start;
+               struct section *section = NULL;
+               int is_label = elf_sym__is_label(&sym);
+               const char *section_name;
 
-               if (!elf_sym__is_function(&sym))
+               if (!is_label && !elf_sym__is_function(&sym))
                        continue;
 
                sec = elf_getscn(elf, sym.st_shndx);
@@ -538,6 +573,11 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                        goto out_elf_end;
 
                gelf_getshdr(sec, &shdr);
+
+               if (is_label && !elf_sec__is_text(&shdr, secstrs))
+                       continue;
+
+               section_name = elf_sec__name(&shdr, secstrs);
                obj_start = sym.st_value;
 
                if (self->prelinked) {
@@ -548,6 +588,17 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                        sym.st_value -= shdr.sh_addr - shdr.sh_offset;
                }
 
+               if (mod) {
+                       section = mod->sections->find_section(mod->sections, section_name);
+                       if (section)
+                               sym.st_value += section->vma;
+                       else {
+                               fprintf(stderr, "dso__load_sym() module %s lookup of %s failed\n",
+                                       mod->name, section_name);
+                               goto out_elf_end;
+                       }
+               }
+
                f = symbol__new(sym.st_value, sym.st_size,
                                elf_sym__name(&sym, symstrs),
                                self->sym_priv_size, obj_start, verbose);
@@ -557,6 +608,7 @@ static int dso__load_sym(struct dso *self, int fd, const char *name,
                if (filter && filter(self, f))
                        symbol__delete(f, self->sym_priv_size);
                else {
+                       f->module = mod;
                        dso__insert_symbol(self, f);
                        nr++;
                }
@@ -606,7 +658,7 @@ more:
                fd = open(name, O_RDONLY);
        } while (fd < 0);
 
-       ret = dso__load_sym(self, fd, name, filter, verbose);
+       ret = dso__load_sym(self, fd, name, filter, verbose, NULL);
        close(fd);
 
        /*
@@ -620,6 +672,86 @@ out:
        return ret;
 }
 
+static int dso__load_module(struct dso *self, struct mod_dso *mods, const char *name,
+                            symbol_filter_t filter, int verbose)
+{
+       struct module *mod = mod_dso__find_module(mods, name);
+       int err = 0, fd;
+
+       if (mod == NULL || !mod->active)
+               return err;
+
+       fd = open(mod->path, O_RDONLY);
+
+       if (fd < 0)
+               return err;
+
+       err = dso__load_sym(self, fd, name, filter, verbose, mod);
+       close(fd);
+
+       return err;
+}
+
+int dso__load_modules(struct dso *self, symbol_filter_t filter, int verbose)
+{
+       struct mod_dso *mods = mod_dso__new_dso("modules");
+       struct module *pos;
+       struct rb_node *next;
+       int err;
+
+       err = mod_dso__load_modules(mods);
+
+       if (err <= 0)
+               return err;
+
+       /*
+        * Iterate over modules, and load active symbols.
+        */
+       next = rb_first(&mods->mods);
+       while (next) {
+               pos = rb_entry(next, struct module, rb_node);
+               err = dso__load_module(self, mods, pos->name, filter, verbose);
+
+               if (err < 0)
+                       break;
+
+               next = rb_next(&pos->rb_node);
+       }
+
+       if (err < 0) {
+               mod_dso__delete_modules(mods);
+               mod_dso__delete_self(mods);
+       }
+
+       return err;
+}
+
+static inline void dso__fill_symbol_holes(struct dso *self)
+{
+       struct symbol *prev = NULL;
+       struct rb_node *nd;
+
+       for (nd = rb_last(&self->syms); nd; nd = rb_prev(nd)) {
+               struct symbol *pos = rb_entry(nd, struct symbol, rb_node);
+
+               if (prev) {
+                       u64 hole = 0;
+                       int alias = pos->start == prev->start;
+
+                       if (!alias)
+                               hole = prev->start - pos->end - 1;
+
+                       if (hole || alias) {
+                               if (alias)
+                                       pos->end = prev->end;
+                               else if (hole)
+                                       pos->end = prev->start - 1;
+                       }
+               }
+               prev = pos;
+       }
+}
+
 static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
                             symbol_filter_t filter, int verbose)
 {
@@ -628,19 +760,26 @@ static int dso__load_vmlinux(struct dso *self, const char *vmlinux,
        if (fd < 0)
                return -1;
 
-       err = dso__load_sym(self, fd, vmlinux, filter, verbose);
+       err = dso__load_sym(self, fd, vmlinux, filter, verbose, NULL);
+
+       if (err > 0)
+               dso__fill_symbol_holes(self);
+
        close(fd);
 
        return err;
 }
 
 int dso__load_kernel(struct dso *self, const char *vmlinux,
-                    symbol_filter_t filter, int verbose)
+                    symbol_filter_t filter, int verbose, int modules)
 {
        int err = -1;
 
-       if (vmlinux)
+       if (vmlinux) {
                err = dso__load_vmlinux(self, vmlinux, filter, verbose);
+               if (err > 0 && modules)
+                       err = dso__load_modules(self, filter, verbose);
+       }
 
        if (err <= 0)
                err = dso__load_kallsyms(self, filter, verbose);
index 65a8449..4e141a3 100644 (file)
@@ -5,6 +5,7 @@
 #include "types.h"
 #include <linux/list.h>
 #include <linux/rbtree.h>
+#include "module.h"
 
 struct symbol {
        struct rb_node  rb_node;
@@ -13,6 +14,7 @@ struct symbol {
        u64             obj_start;
        u64             hist_sum;
        u64             *hist;
+       struct module   *module;
        void            *priv;
        char            name[0];
 };
@@ -41,7 +43,8 @@ static inline void *dso__sym_priv(struct dso *self, struct symbol *sym)
 struct symbol *dso__find_symbol(struct dso *self, u64 ip);
 
 int dso__load_kernel(struct dso *self, const char *vmlinux,
-                    symbol_filter_t filter, int verbose);
+                    symbol_filter_t filter, int verbose, int modules);
+int dso__load_modules(struct dso *self, 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);