[PATCH V3 07/17] perf tools: Allow for extra kernel maps

Adrian Hunter
2018-05-22T10:56:40Z

Identify extra kernel maps by name so that they can be distinguished from
the kernel map and module maps.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/event.c | 2 +-
tools/perf/util/machine.c | 8 ++++++--
tools/perf/util/map.c | 22 ++++++++++++++++++----
tools/perf/util/map.h | 7 ++++++-
tools/perf/util/symbol.c | 7 +++----
5 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 244135b5ea43..aafa9878465f 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -487,7 +487,7 @@ int perf_event__synthesize_modules(struct perf_tool *tool,
for (pos = maps__first(maps); pos; pos = map__next(pos)) {
size_t size;

- if (__map__is_kernel(pos))
+ if (!__map__is_kmodule(pos))
continue;

size = PERF_ALIGN(pos->dso->long_name_len + 1, sizeof(u64));
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index db695603873b..355d23bcd443 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -856,6 +856,7 @@ struct extra_kernel_map {
u64 start;
u64 end;
u64 pgoff;
+ char name[KMAP_NAME_LEN];
};

static int machine__create_extra_kernel_map(struct machine *machine,
@@ -875,11 +876,12 @@ static int machine__create_extra_kernel_map(struct machine *machine,
kmap = map__kmap(map);

kmap->kmaps = &machine->kmaps;
+ strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);

map_groups__insert(&machine->kmaps, map);

- pr_debug2("Added extra kernel map %" PRIx64 "-%" PRIx64 "\n",
- map->start, map->end);
+ pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
+ kmap->name, map->start, map->end);

map__put(map);

@@ -940,6 +942,8 @@ int machine__map_x86_64_entry_trampolines(struct machine *machine,
.pgoff = pgoff,
};

+ strlcpy(xm.name, ENTRY_TRAMPOLINE_NAME, KMAP_NAME_LEN);
+
if (machine__create_extra_kernel_map(machine, kernel, &xm) < 0)
return -1;
}
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index c8fe836e4c3c..6ae97eda370b 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -252,6 +252,13 @@ bool __map__is_kernel(const struct map *map)
return machine__kernel_map(map->groups->machine) == map;
}

+bool __map__is_extra_kernel_map(const struct map *map)
+{
+ struct kmap *kmap = __map__kmap((struct map *)map);
+
+ return kmap && kmap->name[0];
+}
+
bool map__has_symbols(const struct map *map)
{
return dso__has_symbols(map->dso);
@@ -846,15 +853,22 @@ struct map *map__next(struct map *map)
return NULL;
}

-struct kmap *map__kmap(struct map *map)
+struct kmap *__map__kmap(struct map *map)
{
- if (!map->dso || !map->dso->kernel) {
- pr_err("Internal error: map__kmap with a non-kernel map\n");
+ if (!map->dso || !map->dso->kernel)
return NULL;
- }
return (struct kmap *)(map + 1);
}

+struct kmap *map__kmap(struct map *map)
+{
+ struct kmap *kmap = __map__kmap(map);
+
+ if (!kmap)
+ pr_err("Internal error: map__kmap with a non-kernel map\n");
+ return kmap;
+}
+
struct map_groups *map__kmaps(struct map *map)
{
struct kmap *kmap = map__kmap(map);
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index fafcc375ed37..97e2a063bd65 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -47,9 +47,12 @@ struct map {
refcount_t refcnt;
};

+#define KMAP_NAME_LEN 256
+
struct kmap {
struct ref_reloc_sym *ref_reloc_sym;
struct map_groups *kmaps;
+ char name[KMAP_NAME_LEN];
};

struct maps {
@@ -76,6 +79,7 @@ static inline struct map_groups *map_groups__get(struct map_groups *mg)

void map_groups__put(struct map_groups *mg);

+struct kmap *__map__kmap(struct map *map);
struct kmap *map__kmap(struct map *map);
struct map_groups *map__kmaps(struct map *map);

@@ -232,10 +236,11 @@ int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map,
struct map *map_groups__find_by_name(struct map_groups *mg, const char *name);

bool __map__is_kernel(const struct map *map);
+bool __map__is_extra_kernel_map(const struct map *map);

static inline bool __map__is_kmodule(const struct map *map)
{
- return !__map__is_kernel(map);
+ return !__map__is_kernel(map) && !__map__is_extra_kernel_map(map);
}

bool map__has_symbols(const struct map *map);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 929058da6727..cdddae67f40c 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1030,7 +1030,7 @@ struct map *map_groups__first(struct map_groups *mg)
return maps__first(&mg->maps);
}

-static int do_validate_kcore_modules(const char *filename, struct map *map,
+static int do_validate_kcore_modules(const char *filename,
struct map_groups *kmaps)
{
struct rb_root modules = RB_ROOT;
@@ -1046,8 +1046,7 @@ static int do_validate_kcore_modules(const char *filename, struct map *map,
struct map *next = map_groups__next(old_map);
struct module_info *mi;

- if (old_map == map || old_map->start == map->start) {
- /* The kernel map */
+ if (!__map__is_kmodule(old_map)) {
old_map = next;
continue;
}
@@ -1104,7 +1103,7 @@ static int validate_kcore_modules(const char *kallsyms_filename,
kallsyms_filename))
return -EINVAL;

- if (do_validate_kcore_modules(modules_filename, map, kmaps))
+ if (do_validate_kcore_modules(modules_filename, kmaps))
return -EINVAL;

return 0;
--
1.9.1