Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  powerpc/perf_events: Fix call-graph recording, add perf_arch_fetch_caller_regs
  perf top: Add missing initialization to zero
  perf probe: Use original address instead of CU-based address
  perf probe: Fix offset to allow signed value
  perf top: Improve the autosizing of column lenghts
  perf probe: Fix need_dwarf flag if lazy matching is used
  perf probe: Fix probe_point buffer overrun

9 files changed, 62 insertions, 24 deletions

diff --git a/arch/powerpc/include/asm/asm-compat.h b/arch/powerpc/include/asm/asm-compat.h
index c1b475a941eb..a9b91ed3d4b9 100644
--- a/arch/powerpc/include/asm/asm-compat.h
+++ b/arch/powerpc/include/asm/asm-compat.h
@@ -28,6 +28,7 @@
 #define PPC_LLARX(t, a, b, eh)  PPC_LDARX(t, a, b, eh)
 #define PPC_STLCX       stringify_in_c(stdcx.)
 #define PPC_CNTLZL      stringify_in_c(cntlzd)
+#define PPC_LR_STKOFF   16
 
 /* Move to CR, single-entry optimized version. Only available
  * on POWER4 and later.
@@ -51,6 +52,7 @@
 #define PPC_STLCX       stringify_in_c(stwcx.)
 #define PPC_CNTLZL      stringify_in_c(cntlzw)
 #define PPC_MTOCRF      stringify_in_c(mtcrf)
+#define PPC_LR_STKOFF   4
 
 #endif
 
diff --git a/arch/powerpc/kernel/misc.S b/arch/powerpc/kernel/misc.S
index 2d29752cbe16..b485a87c94e1 100644
--- a/arch/powerpc/kernel/misc.S
+++ b/arch/powerpc/kernel/misc.S
@@ -127,3 +127,31 @@ _GLOBAL(__setup_cpu_power7)
 _GLOBAL(__restore_cpu_power7)
         /* place holder */
         blr
+
+#ifdef CONFIG_EVENT_TRACING
+/*
+ * Get a minimal set of registers for our caller's nth caller.
+ * r3 = regs pointer, r5 = n.
+ *
+ * We only get R1 (stack pointer), NIP (next instruction pointer)
+ * and LR (link register).  These are all we can get in the
+ * general case without doing complicated stack unwinding, but
+ * fortunately they are enough to do a stack backtrace, which
+ * is all we need them for.
+ */
+_GLOBAL(perf_arch_fetch_caller_regs)
+        mr      r6,r1
+        cmpwi   r5,0
+        mflr    r4
+        ble     2f
+        mtctr   r5
+1:      PPC_LL  r6,0(r6)
+        bdnz    1b
+        PPC_LL  r4,PPC_LR_STKOFF(r6)
+2:      PPC_LL  r7,0(r6)
+        PPC_LL  r7,PPC_LR_STKOFF(r7)
+        PPC_STL r6,GPR1-STACK_FRAME_OVERHEAD(r3)
+        PPC_STL r4,_NIP-STACK_FRAME_OVERHEAD(r3)
+        PPC_STL r7,_LINK-STACK_FRAME_OVERHEAD(r3)
+        blr
+#endif /* CONFIG_EVENT_TRACING */
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c30a33592340..152d6c9b1fa4 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -47,7 +47,6 @@
 #include "util/probe-event.h"
 
 #define MAX_PATH_LEN 256
-#define MAX_PROBES 128
 
 /* Session management structure */
 static struct {
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 0b719e3dde05..1f529321607e 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -455,7 +455,7 @@ static void print_sym_table(void)
         struct sym_entry *syme, *n;
         struct rb_root tmp = RB_ROOT;
         struct rb_node *nd;
-        int sym_width = 0, dso_width = 0, max_dso_width;
+        int sym_width = 0, dso_width = 0, dso_short_width = 0;
         const int win_width = winsize.ws_col - 1;
 
         samples = userspace_samples = 0;
@@ -545,15 +545,20 @@ static void print_sym_table(void)
                 if (syme->map->dso->long_name_len > dso_width)
                         dso_width = syme->map->dso->long_name_len;
 
+                if (syme->map->dso->short_name_len > dso_short_width)
+                        dso_short_width = syme->map->dso->short_name_len;
+
                 if (syme->name_len > sym_width)
                         sym_width = syme->name_len;
         }
 
         printed = 0;
 
-        max_dso_width = winsize.ws_col - sym_width - 29;
-        if (dso_width > max_dso_width)
-                dso_width = max_dso_width;
+        if (sym_width + dso_width > winsize.ws_col - 29) {
+                dso_width = dso_short_width;
+                if (sym_width + dso_width > winsize.ws_col - 29)
+                        sym_width = winsize.ws_col - dso_width - 29;
+        }
         putchar('\n');
         if (nr_counters == 1)
                 printf("             samples  pcnt");
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 53181dbfe4a8..7c004b6ef24f 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -242,7 +242,7 @@ void parse_perf_probe_event(const char *str, struct probe_point *pp,
 
         /* Parse probe point */
         parse_perf_probe_probepoint(argv[0], pp);
-        if (pp->file || pp->line)
+        if (pp->file || pp->line || pp->lazy_line)
                 *need_dwarf = true;
 
         /* Copy arguments and ensure return probe has no C argument */
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 1e6c65ebbd80..c171a243d05b 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -333,8 +333,8 @@ static void show_location(Dwarf_Op *op, struct probe_finder *pf)
                 die("%u exceeds max register number.", regn);
 
         if (deref)
-                ret = snprintf(pf->buf, pf->len, " %s=+%ju(%s)",
-                               pf->var, (uintmax_t)offs, regs);
+                ret = snprintf(pf->buf, pf->len, " %s=%+jd(%s)",
+                               pf->var, (intmax_t)offs, regs);
         else
                 ret = snprintf(pf->buf, pf->len, " %s=%s", pf->var, regs);
         DIE_IF(ret < 0);
@@ -352,8 +352,7 @@ static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
         if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
                 goto error;
         /* TODO: handle more than 1 exprs */
-        ret = dwarf_getlocation_addr(&attr, (pf->addr - pf->cu_base),
-                                     &expr, &nexpr, 1);
+        ret = dwarf_getlocation_addr(&attr, pf->addr, &expr, &nexpr, 1);
         if (ret <= 0 || nexpr == 0)
                 goto error;
 
@@ -437,8 +436,7 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
 
         /* Get the frame base attribute/ops */
         dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr);
-        ret = dwarf_getlocation_addr(&fb_attr, (pf->addr - pf->cu_base),
-                                     &pf->fb_ops, &nops, 1);
+        ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
         if (ret <= 0 || nops == 0)
                 pf->fb_ops = NULL;
 
@@ -455,6 +453,9 @@ static void show_probe_point(Dwarf_Die *sp_die, struct probe_finder *pf)
         /* *pf->fb_ops will be cached in libdw. Don't free it. */
         pf->fb_ops = NULL;
 
+        if (pp->found == MAX_PROBES)
+                die("Too many( > %d) probe point found.\n", MAX_PROBES);
+
         pp->probes[pp->found] = strdup(tmp);
         pp->found++;
 }
@@ -641,7 +642,6 @@ static void find_probe_point_by_func(struct probe_finder *pf)
 int find_probe_point(int fd, struct probe_point *pp)
 {
         struct probe_finder pf = {.pp = pp};
-        int ret;
         Dwarf_Off off, noff;
         size_t cuhl;
         Dwarf_Die *diep;
@@ -668,10 +668,6 @@ int find_probe_point(int fd, struct probe_point *pp)
                         pf.fname = NULL;
 
                 if (!pp->file || pf.fname) {
-                        /* Save CU base address (for frame_base) */
-                        ret = dwarf_lowpc(&pf.cu_die, &pf.cu_base);
-                        if (ret != 0)
-                                pf.cu_base = 0;
                         if (pp->function)
                                 find_probe_point_by_func(&pf);
                         else if (pp->lazy_line)
diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h
index d1a651793ba6..21f7354397b4 100644
--- a/tools/perf/util/probe-finder.h
+++ b/tools/perf/util/probe-finder.h
@@ -71,7 +71,6 @@ struct probe_finder {
 
         /* For variable searching */
         Dwarf_Op                *fb_ops;        /* Frame base attribute */
-        Dwarf_Addr              cu_base;        /* Current CU base address */
         const char              *var;           /* Current variable name */
         char                    *buf;           /* Current output buffer */
         int                     len;            /* Length of output buffer */
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 323c0aea0a91..c458c4a371d1 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -163,9 +163,17 @@ void dso__set_long_name(struct dso *self, char *name)
         self->long_name_len = strlen(name);
 }
 
+static void dso__set_short_name(struct dso *self, const char *name)
+{
+        if (name == NULL)
+                return;
+        self->short_name = name;
+        self->short_name_len = strlen(name);
+}
+
 static void dso__set_basename(struct dso *self)
 {
-        self->short_name = basename(self->long_name);
+        dso__set_short_name(self, basename(self->long_name));
 }
 
 struct dso *dso__new(const char *name)
@@ -176,7 +184,7 @@ struct dso *dso__new(const char *name)
                 int i;
                 strcpy(self->name, name);
                 dso__set_long_name(self, self->name);
-                self->short_name = self->name;
+                dso__set_short_name(self, self->name);
                 for (i = 0; i < MAP__NR_TYPES; ++i)
                         self->symbols[i] = self->symbol_names[i] = RB_ROOT;
                 self->slen_calculated = 0;
@@ -897,7 +905,6 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name,
         struct kmap *kmap = self->kernel ? map__kmap(map) : NULL;
         struct map *curr_map = map;
         struct dso *curr_dso = self;
-        size_t dso_name_len = strlen(self->short_name);
         Elf_Data *symstrs, *secstrs;
         uint32_t nr_syms;
         int err = -1;
@@ -987,7 +994,8 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name,
                         char dso_name[PATH_MAX];
 
                         if (strcmp(section_name,
-                                   curr_dso->short_name + dso_name_len) == 0)
+                                   (curr_dso->short_name +
+                                    self->short_name_len)) == 0)
                                 goto new_symbol;
 
                         if (strcmp(section_name, ".text") == 0) {
@@ -1782,7 +1790,7 @@ struct dso *dso__new_kernel(const char *name)
         struct dso *self = dso__new(name ?: "[kernel.kallsyms]");
 
         if (self != NULL) {
-                self->short_name = "[kernel]";
+                dso__set_short_name(self, "[kernel]");
                 self->kernel     = 1;
         }
 
diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h
index 280dadd32a08..f30a37428919 100644
--- a/tools/perf/util/symbol.h
+++ b/tools/perf/util/symbol.h
@@ -110,9 +110,10 @@ struct dso {
         u8               sorted_by_name;
         u8               loaded;
         u8               build_id[BUILD_ID_SIZE];
-        u16              long_name_len;
         const char       *short_name;
         char             *long_name;
+        u16              long_name_len;
+        u16              short_name_len;
         char             name[0];
 };