Merge branch 'perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 into perf/core

7 files changed, 236 insertions, 129 deletions

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index a3b84160c42e..d5036700a435 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1092,6 +1092,12 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
         FILE *file;
         int err = 0;
         u64 len;
+        char symfs_filename[PATH_MAX];
+
+        if (filename) {
+                snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
+                         symbol_conf.symfs, filename);
+        }
 
         if (filename == NULL) {
                 if (dso->has_build_id) {
@@ -1100,9 +1106,9 @@ int hist_entry__annotate(struct hist_entry *self, struct list_head *head,
                         return -ENOMEM;
                 }
                 goto fallback;
-        } else if (readlink(filename, command, sizeof(command)) < 0 ||
+        } else if (readlink(symfs_filename, command, sizeof(command)) < 0 ||
                    strstr(command, "[kernel.kallsyms]") ||
-                   access(filename, R_OK)) {
+                   access(symfs_filename, R_OK)) {
                 free(filename);
 fallback:
                 /*
@@ -1111,6 +1117,8 @@ fallback:
                  * DSO is the same as when 'perf record' ran.
                  */
                 filename = dso->long_name;
+                snprintf(symfs_filename, sizeof(symfs_filename), "%s%s",
+                         symbol_conf.symfs, filename);
                 free_filename = false;
         }
 
@@ -1137,7 +1145,7 @@ fallback:
                  "objdump --start-address=0x%016Lx --stop-address=0x%016Lx -dS -C %s|grep -v %s|expand",
                  map__rip_2objdump(map, sym->start),
                  map__rip_2objdump(map, sym->end),
-                 filename, filename);
+                 symfs_filename, filename);
 
         pr_debug("Executing: %s\n", command);
 
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 3b6a5297bf16..099336ed34b4 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -95,7 +95,7 @@ static int init_vmlinux(void)
                 goto out;
 
         if (machine__create_kernel_maps(&machine) < 0) {
-                pr_debug("machine__create_kernel_maps ");
+                pr_debug("machine__create_kernel_maps() failed.\n");
                 goto out;
         }
 out:
@@ -140,7 +140,8 @@ static int open_vmlinux(const char *module)
 {
         const char *path = kernel_get_module_path(module);
         if (!path) {
-                pr_err("Failed to find path of %s module", module ?: "kernel");
+                pr_err("Failed to find path of %s module.\n",
+                       module ?: "kernel");
                 return -ENOENT;
         }
         pr_debug("Try to open %s\n", path);
@@ -217,7 +218,7 @@ static int try_to_find_probe_trace_events(struct perf_probe_event *pev,
                 pr_warning("Warning: No dwarf info found in the vmlinux - "
                         "please rebuild kernel with CONFIG_DEBUG_INFO=y.\n");
                 if (!need_dwarf) {
-                        pr_debug("Trying to use symbols.\nn");
+                        pr_debug("Trying to use symbols.\n");
                         return 0;
                 }
         }
@@ -286,42 +287,49 @@ static int get_real_path(const char *raw_path, const char *comp_dir,
 #define LINEBUF_SIZE 256
 #define NR_ADDITIONAL_LINES 2
 
-static int show_one_line(FILE *fp, int l, bool skip, bool show_num)
+static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
 {
         char buf[LINEBUF_SIZE];
-        const char *color = PERF_COLOR_BLUE;
+        const char *color = show_num ? "" : PERF_COLOR_BLUE;
+        const char *prefix = NULL;
 
-        if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
-                goto error;
-        if (!skip) {
-                if (show_num)
-                        fprintf(stdout, "%7d  %s", l, buf);
-                else
-                        color_fprintf(stdout, color, "         %s", buf);
-        }
-
-        while (strlen(buf) == LINEBUF_SIZE - 1 &&
-               buf[LINEBUF_SIZE - 2] != '\n') {
+        do {
                 if (fgets(buf, LINEBUF_SIZE, fp) == NULL)
                         goto error;
-                if (!skip) {
-                        if (show_num)
-                                fprintf(stdout, "%s", buf);
-                        else
-                                color_fprintf(stdout, color, "%s", buf);
+                if (skip)
+                        continue;
+                if (!prefix) {
+                        prefix = show_num ? "%7d  " : "         ";
+                        color_fprintf(stdout, color, prefix, l);
                 }
-        }
+                color_fprintf(stdout, color, "%s", buf);
 
-        return 0;
+        } while (strchr(buf, '\n') == NULL);
+
+        return 1;
 error:
-        if (feof(fp))
+        if (ferror(fp)) {
                 pr_warning("Source file is shorter than expected.\n");
-        else
-                pr_warning("File read error: %s\n", strerror(errno));
+                return -1;
+        }
+        return 0;
+}
 
-        return -1;
+static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
+{
+        int rv = __show_one_line(fp, l, skip, show_num);
+        if (rv == 0) {
+                pr_warning("Source file is shorter than expected.\n");
+                rv = -1;
+        }
+        return rv;
 }
 
+#define show_one_line_with_num(f,l)     _show_one_line(f,l,false,true)
+#define show_one_line(f,l)              _show_one_line(f,l,false,false)
+#define skip_one_line(f,l)              _show_one_line(f,l,true,false)
+#define show_one_line_or_eof(f,l)       __show_one_line(f,l,false,false)
+
 /*
  * Show line-range always requires debuginfo to find source file and
  * line number.
@@ -370,7 +378,7 @@ int show_line_range(struct line_range *lr, const char *module)
                 fprintf(stdout, "<%s:%d>\n", lr->function,
                         lr->start - lr->offset);
         else
-                fprintf(stdout, "<%s:%d>\n", lr->file, lr->start);
+                fprintf(stdout, "<%s:%d>\n", lr->path, lr->start);
 
         fp = fopen(lr->path, "r");
         if (fp == NULL) {
@@ -379,26 +387,30 @@ int show_line_range(struct line_range *lr, const char *module)
                 return -errno;
         }
         /* Skip to starting line number */
-        while (l < lr->start && ret >= 0)
-                ret = show_one_line(fp, l++, true, false);
-        if (ret < 0)
-                goto end;
+        while (l < lr->start) {
+                ret = skip_one_line(fp, l++);
+                if (ret < 0)
+                        goto end;
+        }
 
         list_for_each_entry(ln, &lr->line_list, list) {
-                while (ln->line > l && ret >= 0)
-                        ret = show_one_line(fp, (l++) - lr->offset,
-                                            false, false);
-                if (ret >= 0)
-                        ret = show_one_line(fp, (l++) - lr->offset,
-                                            false, true);
+                for (; ln->line > l; l++) {
+                        ret = show_one_line(fp, l - lr->offset);
+                        if (ret < 0)
+                                goto end;
+                }
+                ret = show_one_line_with_num(fp, l++ - lr->offset);
                 if (ret < 0)
                         goto end;
         }
 
         if (lr->end == INT_MAX)
                 lr->end = l + NR_ADDITIONAL_LINES;
-        while (l <= lr->end && !feof(fp) && ret >= 0)
-                ret = show_one_line(fp, (l++) - lr->offset, false, false);
+        while (l <= lr->end) {
+                ret = show_one_line_or_eof(fp, l++ - lr->offset);
+                if (ret <= 0)
+                        break;
+        }
 end:
         fclose(fp);
         return ret;
@@ -457,7 +469,7 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
 
         fd = open_vmlinux(module);
         if (fd < 0) {
-                pr_warning("Failed to open debuginfo file.\n");
+                pr_warning("Failed to open debug information file.\n");
                 return fd;
         }
 
@@ -517,56 +529,87 @@ int show_available_vars(struct perf_probe_event *pevs __unused,
 }
 #endif
 
+static int parse_line_num(char **ptr, int *val, const char *what)
+{
+        const char *start = *ptr;
+
+        errno = 0;
+        *val = strtol(*ptr, ptr, 0);
+        if (errno || *ptr == start) {
+                semantic_error("'%s' is not a valid number.\n", what);
+                return -EINVAL;
+        }
+        return 0;
+}
+
+/*
+ * Stuff 'lr' according to the line range described by 'arg'.
+ * The line range syntax is described by:
+ *
+ *         SRC[:SLN[+NUM|-ELN]]
+ *         FNC[:SLN[+NUM|-ELN]]
+ */
 int parse_line_range_desc(const char *arg, struct line_range *lr)
 {
-        const char *ptr;
-        char *tmp;
-        /*
-         * <Syntax>
-         * SRC:SLN[+NUM|-ELN]
-         * FUNC[:SLN[+NUM|-ELN]]
-         */
-        ptr = strchr(arg, ':');
-        if (ptr) {
-                lr->start = (int)strtoul(ptr + 1, &tmp, 0);
-                if (*tmp == '+') {
-                        lr->end = lr->start + (int)strtoul(tmp + 1, &tmp, 0);
-                        lr->end--;      /*
-                                         * Adjust the number of lines here.
-                                         * If the number of lines == 1, the
-                                         * the end of line should be equal to
-                                         * the start of line.
-                                         */
-                } else if (*tmp == '-')
-                        lr->end = (int)strtoul(tmp + 1, &tmp, 0);
-                else
-                        lr->end = INT_MAX;
+        char *range, *name = strdup(arg);
+        int err;
+
+        if (!name)
+                return -ENOMEM;
+
+        lr->start = 0;
+        lr->end = INT_MAX;
+
+        range = strchr(name, ':');
+        if (range) {
+                *range++ = '\0';
+
+                err = parse_line_num(&range, &lr->start, "start line");
+                if (err)
+                        goto err;
+
+                if (*range == '+' || *range == '-') {
+                        const char c = *range++;
+
+                        err = parse_line_num(&range, &lr->end, "end line");
+                        if (err)
+                                goto err;
+
+                        if (c == '+') {
+                                lr->end += lr->start;
+                                /*
+                                 * Adjust the number of lines here.
+                                 * If the number of lines == 1, the
+                                 * the end of line should be equal to
+                                 * the start of line.
+                                 */
+                                lr->end--;
+                        }
+                }
+
                 pr_debug("Line range is %d to %d\n", lr->start, lr->end);
+
+                err = -EINVAL;
                 if (lr->start > lr->end) {
                         semantic_error("Start line must be smaller"
                                        " than end line.\n");
-                        return -EINVAL;
+                        goto err;
                 }
-                if (*tmp != '\0') {
-                        semantic_error("Tailing with invalid character '%d'.\n",
-                                       *tmp);
-                        return -EINVAL;
+                if (*range != '\0') {
+                        semantic_error("Tailing with invalid str '%s'.\n", range);
+                        goto err;
                 }
-                tmp = strndup(arg, (ptr - arg));
-        } else {
-                tmp = strdup(arg);
-                lr->end = INT_MAX;
         }
 
-        if (tmp == NULL)
-                return -ENOMEM;
-
-        if (strchr(tmp, '.'))
-                lr->file = tmp;
+        if (strchr(name, '.'))
+                lr->file = name;
         else
-                lr->function = tmp;
+                lr->function = name;
 
         return 0;
+err:
+        free(name);
+        return err;
 }
 
 /* Check the name is good for event/group */
@@ -690,39 +733,40 @@ static int parse_perf_probe_point(char *arg, struct perf_probe_event *pev)
 
         /* Exclusion check */
         if (pp->lazy_line && pp->line) {
-                semantic_error("Lazy pattern can't be used with line number.");
+                semantic_error("Lazy pattern can't be used with"
+                               " line number.\n");
                 return -EINVAL;
         }
 
         if (pp->lazy_line && pp->offset) {
-                semantic_error("Lazy pattern can't be used with offset.");
+                semantic_error("Lazy pattern can't be used with offset.\n");
                 return -EINVAL;
         }
 
         if (pp->line && pp->offset) {
-                semantic_error("Offset can't be used with line number.");
+                semantic_error("Offset can't be used with line number.\n");
                 return -EINVAL;
         }
 
         if (!pp->line && !pp->lazy_line && pp->file && !pp->function) {
                 semantic_error("File always requires line number or "
-                               "lazy pattern.");
+                               "lazy pattern.\n");
                 return -EINVAL;
         }
 
         if (pp->offset && !pp->function) {
-                semantic_error("Offset requires an entry function.");
+                semantic_error("Offset requires an entry function.\n");
                 return -EINVAL;
         }
 
         if (pp->retprobe && !pp->function) {
-                semantic_error("Return probe requires an entry function.");
+                semantic_error("Return probe requires an entry function.\n");
                 return -EINVAL;
         }
 
         if ((pp->offset || pp->line || pp->lazy_line) && pp->retprobe) {
                 semantic_error("Offset/Line/Lazy pattern can't be used with "
-                               "return probe.");
+                               "return probe.\n");
                 return -EINVAL;
         }
 
@@ -996,7 +1040,7 @@ int synthesize_perf_probe_arg(struct perf_probe_arg *pa, char *buf, size_t len)
 
         return tmp - buf;
 error:
-        pr_debug("Failed to synthesize perf probe argument: %s",
+        pr_debug("Failed to synthesize perf probe argument: %s\n",
                  strerror(-ret));
         return ret;
 }
@@ -1046,7 +1090,7 @@ static char *synthesize_perf_probe_point(struct perf_probe_point *pp)
 
         return buf;
 error:
-        pr_debug("Failed to synthesize perf probe point: %s",
+        pr_debug("Failed to synthesize perf probe point: %s\n",
                  strerror(-ret));
         if (buf)
                 free(buf);
@@ -1787,7 +1831,7 @@ static int del_trace_probe_event(int fd, const char *group,
 
         ret = e_snprintf(buf, 128, "%s:%s", group, event);
         if (ret < 0) {
-                pr_err("Failed to copy event.");
+                pr_err("Failed to copy event.\n");
                 return ret;
         }
 
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 3991d73d1cff..90b629226bd7 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -627,8 +627,8 @@ static_var:
         regs = get_arch_regstr(regn);
         if (!regs) {
                 /* This should be a bug in DWARF or this tool */
-                pr_warning("Mapping for DWARF register number %u "
-                           "missing on this architecture.", regn);
+                pr_warning("Mapping for the register number %u "
+                           "missing on this architecture.\n", regn);
                 return -ERANGE;
         }
 
@@ -674,13 +674,14 @@ static int convert_variable_type(Dwarf_Die *vr_die,
                 if (ret != DW_TAG_pointer_type &&
                     ret != DW_TAG_array_type) {
                         pr_warning("Failed to cast into string: "
-                                   "%s(%s) is not a pointer nor array.",
+                                   "%s(%s) is not a pointer nor array.\n",
                                    dwarf_diename(vr_die), dwarf_diename(&type));
                         return -EINVAL;
                 }
                 if (ret == DW_TAG_pointer_type) {
                         if (die_get_real_type(&type, &type) == NULL) {
-                                pr_warning("Failed to get a type information.");
+                                pr_warning("Failed to get a type"
+                                           " information.\n");
                                 return -ENOENT;
                         }
                         while (*ref_ptr)
@@ -695,7 +696,7 @@ static int convert_variable_type(Dwarf_Die *vr_die,
                 if (!die_compare_name(&type, "char") &&
                     !die_compare_name(&type, "unsigned char")) {
                         pr_warning("Failed to cast into string: "
-                                   "%s is not (unsigned) char *.",
+                                   "%s is not (unsigned) char *.\n",
                                    dwarf_diename(vr_die));
                         return -EINVAL;
                 }
@@ -805,8 +806,8 @@ static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname,
                         return -EINVAL;
                 }
                 if (field->name[0] == '[') {
-                        pr_err("Semantic error: %s is not a pointor nor array.",
-                               varname);
+                        pr_err("Semantic error: %s is not a pointor"
+                               " nor array.\n", varname);
                         return -EINVAL;
                 }
                 if (field->ref) {
@@ -953,7 +954,7 @@ static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr,
         name = dwarf_diename(sp_die);
         if (name) {
                 if (dwarf_entrypc(sp_die, &eaddr) != 0) {
-                        pr_warning("Failed to get entry pc of %s\n",
+                        pr_warning("Failed to get entry address of %s\n",
                                    dwarf_diename(sp_die));
                         return -ENOENT;
                 }
@@ -969,7 +970,7 @@ static int convert_to_trace_point(Dwarf_Die *sp_die, Dwarf_Addr paddr,
         if (retprobe) {
                 if (eaddr != paddr) {
                         pr_warning("Return probe must be on the head of"
-                                   " a real function\n");
+                                   " a real function.\n");
                         return -EINVAL;
                 }
                 tp->retprobe = true;
@@ -1008,7 +1009,7 @@ static int call_probe_finder(Dwarf_Die *sp_die, struct probe_finder *pf)
                 Dwarf_Frame *frame;
                 if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 ||
                     dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
-                        pr_warning("Failed to get CFA on 0x%jx\n",
+                        pr_warning("Failed to get call frame on 0x%jx\n",
                                    (uintmax_t)pf->addr);
                         return -ENOENT;
                 }
@@ -1035,7 +1036,7 @@ static int find_probe_point_by_line(struct probe_finder *pf)
         int ret = 0;
 
         if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) {
-                pr_warning("No source lines found in this CU.\n");
+                pr_warning("No source lines found.\n");
                 return -ENOENT;
         }
 
@@ -1137,7 +1138,7 @@ static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
         }
 
         if (dwarf_getsrclines(&pf->cu_die, &lines, &nlines) != 0) {
-                pr_warning("No source lines found in this CU.\n");
+                pr_warning("No source lines found.\n");
                 return -ENOENT;
         }
 
@@ -1195,7 +1196,7 @@ static int probe_point_inline_cb(Dwarf_Die *in_die, void *data)
         else {
                 /* Get probe address */
                 if (dwarf_entrypc(in_die, &addr) != 0) {
-                        pr_warning("Failed to get entry pc of %s.\n",
+                        pr_warning("Failed to get entry address of %s.\n",
                                    dwarf_diename(in_die));
                         param->retval = -ENOENT;
                         return DWARF_CB_ABORT;
@@ -1236,8 +1237,8 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
                         param->retval = find_probe_point_lazy(sp_die, pf);
                 else {
                         if (dwarf_entrypc(sp_die, &pf->addr) != 0) {
-                                pr_warning("Failed to get entry pc of %s.\n",
-                                           dwarf_diename(sp_die));
+                                pr_warning("Failed to get entry address of "
+                                           "%s.\n", dwarf_diename(sp_die));
                                 param->retval = -ENOENT;
                                 return DWARF_CB_ABORT;
                         }
@@ -1279,7 +1280,7 @@ static int find_probes(int fd, struct probe_finder *pf)
 
         dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias);
         if (!dbg) {
-                pr_warning("No dwarf info found in the vmlinux - "
+                pr_warning("No debug information found in the vmlinux - "
                         "please rebuild with CONFIG_DEBUG_INFO=y.\n");
                 return -EBADF;
         }
@@ -1524,7 +1525,7 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
         /* Open the live linux kernel */
         dbg = dwfl_init_live_kernel_dwarf(addr, &dwfl, &bias);
         if (!dbg) {
-                pr_warning("No dwarf info found in the vmlinux - "
+                pr_warning("No debug information found in the vmlinux - "
                         "please rebuild with CONFIG_DEBUG_INFO=y.\n");
                 ret = -EINVAL;
                 goto end;
@@ -1534,7 +1535,8 @@ int find_perf_probe_point(unsigned long addr, struct perf_probe_point *ppt)
         addr += bias;
         /* Find cu die */
         if (!dwarf_addrdie(dbg, (Dwarf_Addr)addr - bias, &cudie)) {
-                pr_warning("No CU DIE is found at %lx\n", addr);
+                pr_warning("Failed to find debug information for address %lx\n",
+                           addr);
                 ret = -EINVAL;
                 goto end;
         }
@@ -1659,7 +1661,7 @@ static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf)
 
         line_list__init(&lf->lr->line_list);
         if (dwarf_getsrclines(&lf->cu_die, &lines, &nlines) != 0) {
-                pr_warning("No source lines found in this CU.\n");
+                pr_warning("No source lines found.\n");
                 return -ENOENT;
         }
 
@@ -1784,7 +1786,7 @@ int find_line_range(int fd, struct line_range *lr)
 
         dbg = dwfl_init_offline_dwarf(fd, &dwfl, &bias);
         if (!dbg) {
-                pr_warning("No dwarf info found in the vmlinux - "
+                pr_warning("No debug information found in the vmlinux - "
                         "please rebuild with CONFIG_DEBUG_INFO=y.\n");
                 return -EBADF;
         }
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index b59abf5aba36..0f7e544544f5 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -125,7 +125,9 @@ static void perf_session__destroy_kernel_maps(struct perf_session *self)
         machines__destroy_guest_kernel_maps(&self->machines);
 }
 
-struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe)
+struct perf_session *perf_session__new(const char *filename, int mode,
+                                       bool force, bool repipe,
+                                       struct perf_event_ops *ops)
 {
         size_t len = filename ? strlen(filename) + 1 : 0;
         struct perf_session *self = zalloc(sizeof(*self) + len);
@@ -170,6 +172,13 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc
         }
 
         perf_session__update_sample_type(self);
+
+        if (ops && ops->ordering_requires_timestamps &&
+            ops->ordered_samples && !self->sample_id_all) {
+                dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
+                ops->ordered_samples = false;
+        }
+
 out:
         return self;
 out_free:
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index ac36f99f14af..ffe4b98db8f0 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -78,9 +78,12 @@ struct perf_event_ops {
                         build_id;
         event_op2       finished_round;
         bool            ordered_samples;
+        bool            ordering_requires_timestamps;
 };
 
-struct perf_session *perf_session__new(const char *filename, int mode, bool force, bool repipe);
+struct perf_session *perf_session__new(const char *filename, int mode,
+                                       bool force, bool repipe,
+                                       struct perf_event_ops *ops);
 void perf_session__delete(struct perf_session *self);
 
 void perf_event_header__bswap(struct perf_event_header *self);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index ceefa6568def..561db6361f57 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -41,6 +41,7 @@ struct symbol_conf symbol_conf = {
         .exclude_other    = true,
         .use_modules      = true,
         .try_vmlinux_path = true,
+        .symfs            = "",
 };
 
 int dso__name_len(const struct dso *self)
@@ -839,8 +840,11 @@ static int dso__synthesize_plt_symbols(struct  dso *self, struct map *map,
         char sympltname[1024];
         Elf *elf;
         int nr = 0, symidx, fd, err = 0;
+        char name[PATH_MAX];
 
-        fd = open(self->long_name, O_RDONLY);
+        snprintf(name, sizeof(name), "%s%s",
+                 symbol_conf.symfs, self->long_name);
+        fd = open(name, O_RDONLY);
         if (fd < 0)
                 goto out;
 
@@ -1452,16 +1456,19 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
              self->origin++) {
                 switch (self->origin) {
                 case DSO__ORIG_BUILD_ID_CACHE:
-                        if (dso__build_id_filename(self, name, size) == NULL)
+                        /* skip the locally configured cache if a symfs is given */
+                        if (symbol_conf.symfs[0] ||
+                            (dso__build_id_filename(self, name, size) == NULL)) {
                                 continue;
+                        }
                         break;
                 case DSO__ORIG_FEDORA:
-                        snprintf(name, size, "/usr/lib/debug%s.debug",
-                                 self->long_name);
+                        snprintf(name, size, "%s/usr/lib/debug%s.debug",
+                                 symbol_conf.symfs, self->long_name);
                         break;
                 case DSO__ORIG_UBUNTU:
-                        snprintf(name, size, "/usr/lib/debug%s",
-                                 self->long_name);
+                        snprintf(name, size, "%s/usr/lib/debug%s",
+                                 symbol_conf.symfs, self->long_name);
                         break;
                 case DSO__ORIG_BUILDID: {
                         char build_id_hex[BUILD_ID_SIZE * 2 + 1];
@@ -1473,19 +1480,26 @@ int dso__load(struct dso *self, struct map *map, symbol_filter_t filter)
                                           sizeof(self->build_id),
                                           build_id_hex);
                         snprintf(name, size,
-                                 "/usr/lib/debug/.build-id/%.2s/%s.debug",
-                                 build_id_hex, build_id_hex + 2);
+                                 "%s/usr/lib/debug/.build-id/%.2s/%s.debug",
+                                 symbol_conf.symfs, build_id_hex, build_id_hex + 2);
                         }
                         break;
                 case DSO__ORIG_DSO:
-                        snprintf(name, size, "%s", self->long_name);
+                        snprintf(name, size, "%s%s",
+                             symbol_conf.symfs, self->long_name);
                         break;
                 case DSO__ORIG_GUEST_KMODULE:
                         if (map->groups && map->groups->machine)
                                 root_dir = map->groups->machine->root_dir;
                         else
                                 root_dir = "";
-                        snprintf(name, size, "%s%s", root_dir, self->long_name);
+                        snprintf(name, size, "%s%s%s", symbol_conf.symfs,
+                                 root_dir, self->long_name);
+                        break;
+
+                case DSO__ORIG_KMODULE:
+                        snprintf(name, size, "%s%s", symbol_conf.symfs,
+                                 self->long_name);
                         break;
 
                 default:
@@ -1784,17 +1798,20 @@ static int dso__load_vmlinux(struct dso *self, struct map *map,
                              const char *vmlinux, symbol_filter_t filter)
 {
         int err = -1, fd;
+        char symfs_vmlinux[PATH_MAX];
 
-        fd = open(vmlinux, O_RDONLY);
+        snprintf(symfs_vmlinux, sizeof(symfs_vmlinux), "%s/%s",
+                 symbol_conf.symfs, vmlinux);
+        fd = open(symfs_vmlinux, O_RDONLY);
         if (fd < 0)
                 return -1;
 
         dso__set_loaded(self, map->type);
-        err = dso__load_sym(self, map, vmlinux, fd, filter, 0, 0);
+        err = dso__load_sym(self, map, symfs_vmlinux, fd, filter, 0, 0);
         close(fd);
 
         if (err > 0)
-                pr_debug("Using %s for symbols\n", vmlinux);
+                pr_debug("Using %s for symbols\n", symfs_vmlinux);
 
         return err;
 }
@@ -1872,6 +1889,10 @@ static int dso__load_kernel_sym(struct dso *self, struct map *map,
                         goto out_fixup;
         }
 
+        /* do not try local files if a symfs was given */
+        if (symbol_conf.symfs[0] != 0)
+                return -1;
+
         /*
          * Say the kernel DSO was created when processing the build-id header table,
          * we have a build-id, so check if it is the same as the running kernel,
@@ -2262,9 +2283,6 @@ static int vmlinux_path__init(void)
         struct utsname uts;
         char bf[PATH_MAX];
 
-        if (uname(&uts) < 0)
-                return -1;
-
         vmlinux_path = malloc(sizeof(char *) * 5);
         if (vmlinux_path == NULL)
                 return -1;
@@ -2277,6 +2295,14 @@ static int vmlinux_path__init(void)
         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
                 goto out_fail;
         ++vmlinux_path__nr_entries;
+
+        /* only try running kernel version if no symfs was given */
+        if (symbol_conf.symfs[0] != 0)
+                return 0;
+
+        if (uname(&uts) < 0)
+                return -1;
+
         snprintf(bf, sizeof(bf), "/boot/vmlinux-%s", uts.release);
         vmlinux_path[vmlinux_path__nr_entries] = strdup(bf);
         if (vmlinux_path[vmlinux_path__nr_entries] == NULL)
@@ -2336,6 +2362,8 @@ static int setup_list(struct strlist **list, const char *list_str,
 
 int symbol__init(void)
 {
+        const char *symfs;
+
         if (symbol_conf.initialized)
                 return 0;
 
@@ -2364,6 +2392,18 @@ int symbol__init(void)
                        symbol_conf.sym_list_str, "symbol") < 0)
                 goto out_free_comm_list;
 
+        /*
+         * A path to symbols of "/" is identical to ""
+         * reset here for simplicity.
+         */
+        symfs = realpath(symbol_conf.symfs, NULL);
+        if (symfs == NULL)
+                symfs = symbol_conf.symfs;
+        if (strcmp(symfs, "/") == 0)
+                symbol_conf.symfs = "";
+        if (symfs != symbol_conf.symfs)
+                free((void *)symfs);
+
         symbol_conf.initialized = true;
         return 0;
 
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 12defbe18c13..bcd2f986927e 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -86,6 +86,7 @@ struct symbol_conf {
        struct strlist   *dso_list,
                         *comm_list,
                         *sym_list;
+        const char      *symfs;
 };
 
 extern struct symbol_conf symbol_conf;