[GIT PULL] perf fixes

From: Ingo Molnar
Date: Sat Apr 14 2012 - 06:54:36 EST

Linus,

Please pull the latest perf-urgent-for-linus git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-for-linus

HEAD: a7ca08038b990e2cbed324948664b2d8940fd782 Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent

Misc fixes.

Thanks,

Ingo

------------------>
Arnaldo Carvalho de Melo (3):
perf top: Add intel_idle to the skip list
perf annotate: Fix hist decay
perf annotate: Validate addr in symbol__inc_addr_samples

David Miller (1):
perf hists: Catch and handle out-of-date hist entry maps.

Jiri Olsa (1):
perf hists browser: Fix NULL deref in hists browsing code

Nikunj A. Dadhania (1):
perf kvm: Finding struct machine fails for PERF_RECORD_MMAP


tools/perf/builtin-top.c | 36 ++++++++++++++++++++++++++++++++++-
tools/perf/util/annotate.c | 16 +++++---------
tools/perf/util/hist.c | 12 +++++++++++
tools/perf/util/map.c | 1 +
tools/perf/util/map.h | 1 +
tools/perf/util/session.c | 12 +++++++++-
tools/perf/util/ui/browsers/hists.c | 3 ++
7 files changed, 68 insertions(+), 13 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index e3c63ae..8ef59f8 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -42,6 +42,7 @@
#include "util/debug.h"

#include <assert.h>
+#include <elf.h>
#include <fcntl.h>

#include <stdio.h>
@@ -59,6 +60,7 @@
#include <sys/prctl.h>
#include <sys/wait.h>
#include <sys/uio.h>
+#include <sys/utsname.h>
#include <sys/mman.h>

#include <linux/unistd.h>
@@ -162,12 +164,40 @@ static void __zero_source_counters(struct hist_entry *he)
symbol__annotate_zero_histograms(sym);
}

+static void ui__warn_map_erange(struct map *map, struct symbol *sym, u64 ip)
+{
+ struct utsname uts;
+ int err = uname(&uts);
+
+ ui__warning("Out of bounds address found:\n\n"
+ "Addr: %" PRIx64 "\n"
+ "DSO: %s %c\n"
+ "Map: %" PRIx64 "-%" PRIx64 "\n"
+ "Symbol: %" PRIx64 "-%" PRIx64 " %c %s\n"
+ "Arch: %s\n"
+ "Kernel: %s\n"
+ "Tools: %s\n\n"
+ "Not all samples will be on the annotation output.\n\n"
+ "Please report to linux-kernel@xxxxxxxxxxxxxxx\n",
+ ip, map->dso->long_name, dso__symtab_origin(map->dso),
+ map->start, map->end, sym->start, sym->end,
+ sym->binding == STB_GLOBAL ? 'g' :
+ sym->binding == STB_LOCAL ? 'l' : 'w', sym->name,
+ err ? "[unknown]" : uts.machine,
+ err ? "[unknown]" : uts.release, perf_version_string);
+ if (use_browser <= 0)
+ sleep(5);
+
+ map->erange_warned = true;
+}
+
static void perf_top__record_precise_ip(struct perf_top *top,
struct hist_entry *he,
int counter, u64 ip)
{
struct annotation *notes;
struct symbol *sym;
+ int err;

if (he == NULL || he->ms.sym == NULL ||
((top->sym_filter_entry == NULL ||
@@ -189,9 +219,12 @@ static void perf_top__record_precise_ip(struct perf_top *top,
}

ip = he->ms.map->map_ip(he->ms.map, ip);
- symbol__inc_addr_samples(sym, he->ms.map, counter, ip);
+ err = symbol__inc_addr_samples(sym, he->ms.map, counter, ip);

pthread_mutex_unlock(&notes->lock);
+
+ if (err == -ERANGE && !he->ms.map->erange_warned)
+ ui__warn_map_erange(he->ms.map, sym, ip);
}

static void perf_top__show_details(struct perf_top *top)
@@ -615,6 +648,7 @@ process_hotkey:

/* Tag samples to be skipped. */
static const char *skip_symbols[] = {
+ "intel_idle",
"default_idle",
"native_safe_halt",
"cpu_idle",
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 199f69e..08c6d13 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -64,8 +64,8 @@ int symbol__inc_addr_samples(struct symbol *sym, struct map *map,

pr_debug3("%s: addr=%#" PRIx64 "\n", __func__, map->unmap_ip(map, addr));

- if (addr > sym->end)
- return 0;
+ if (addr < sym->start || addr > sym->end)
+ return -ERANGE;

offset = addr - sym->start;
h = annotation__histogram(notes, evidx);
@@ -561,16 +561,12 @@ void symbol__annotate_decay_histogram(struct symbol *sym, int evidx)
{
struct annotation *notes = symbol__annotation(sym);
struct sym_hist *h = annotation__histogram(notes, evidx);
- struct objdump_line *pos;
- int len = sym->end - sym->start;
+ int len = sym->end - sym->start, offset;

h->sum = 0;
-
- list_for_each_entry(pos, &notes->src->source, node) {
- if (pos->offset != -1 && pos->offset < len) {
- h->addr[pos->offset] = h->addr[pos->offset] * 7 / 8;
- h->sum += h->addr[pos->offset];
- }
+ for (offset = 0; offset < len; ++offset) {
+ h->addr[offset] = h->addr[offset] * 7 / 8;
+ h->sum += h->addr[offset];
}
}

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 2ec4b60..9f6d630 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -256,6 +256,18 @@ static struct hist_entry *add_hist_entry(struct hists *hists,
if (!cmp) {
he->period += period;
++he->nr_events;
+
+ /* If the map of an existing hist_entry has
+ * become out-of-date due to an exec() or
+ * similar, update it. Otherwise we will
+ * mis-adjust symbol addresses when computing
+ * the history counter to increment.
+ */
+ if (he->ms.map != entry->ms.map) {
+ he->ms.map = entry->ms.map;
+ if (he->ms.map)
+ he->ms.map->referenced = true;
+ }
goto out;
}

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index dea6d1c..35ae568 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -38,6 +38,7 @@ void map__init(struct map *self, enum map_type type,
RB_CLEAR_NODE(&self->rb_node);
self->groups = NULL;
self->referenced = false;
+ self->erange_warned = false;
}

struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index b100c20..81371ba 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -33,6 +33,7 @@ struct map {
u64 end;
u8 /* enum map_type */ type;
bool referenced;
+ bool erange_warned;
u32 priv;
u64 pgoff;

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 9412e3b..00923cd 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -826,8 +826,16 @@ static struct machine *
{
const u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;

- if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest)
- return perf_session__find_machine(session, event->ip.pid);
+ if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL && perf_guest) {
+ u32 pid;
+
+ if (event->header.type == PERF_RECORD_MMAP)
+ pid = event->mmap.pid;
+ else
+ pid = event->ip.pid;
+
+ return perf_session__find_machine(session, pid);
+ }

return perf_session__find_host_machine(session);
}
diff --git a/tools/perf/util/ui/browsers/hists.c b/tools/perf/util/ui/browsers/hists.c
index d7a1c4a..2f83e5d 100644
--- a/tools/perf/util/ui/browsers/hists.c
+++ b/tools/perf/util/ui/browsers/hists.c
@@ -125,6 +125,9 @@ static int callchain__count_rows(struct rb_root *chain)

static bool map_symbol__toggle_fold(struct map_symbol *self)
{
+ if (!self)
+ return false;
+
if (!self->has_children)
return false;

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