[PATCH V4 12/13] perf tools: Add support for PERF_RECORD_KSYMBOL_TYPE_OOL

Adrian Hunter
2020-03-04T09:08:12Z

PERF_RECORD_KSYMBOL_TYPE_OOL marks an executable page. Create a map backed
only by memory, which will populated as necessary by text poke events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/include/uapi/linux/perf_event.h | 5 +++++
tools/perf/util/dso.c | 3 +++
tools/perf/util/dso.h | 1 +
tools/perf/util/machine.c | 6 ++++++
tools/perf/util/map.c | 5 +++++
tools/perf/util/map.h | 3 ++-
tools/perf/util/symbol.c | 1 +
7 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index bae9e9d2d897..f80ce2e9f8b9 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -1031,6 +1031,11 @@ enum perf_event_type {
enum perf_record_ksymbol_type {
PERF_RECORD_KSYMBOL_TYPE_UNKNOWN = 0,
PERF_RECORD_KSYMBOL_TYPE_BPF = 1,
+ /*
+ * Out of line code such as kprobe-replaced instructions or optimized
+ * kprobes or ftrace trampolines.
+ */
+ PERF_RECORD_KSYMBOL_TYPE_OOL = 2,
PERF_RECORD_KSYMBOL_TYPE_MAX /* non-ABI */
};

diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c
index 91f21239608b..9eb50ff6da96 100644
--- a/tools/perf/util/dso.c
+++ b/tools/perf/util/dso.c
@@ -191,6 +191,7 @@ int dso__read_binary_type_filename(const struct dso *dso,
case DSO_BINARY_TYPE__GUEST_KALLSYMS:
case DSO_BINARY_TYPE__JAVA_JIT:
case DSO_BINARY_TYPE__BPF_PROG_INFO:
+ case DSO_BINARY_TYPE__OOL:
case DSO_BINARY_TYPE__NOT_FOUND:
ret = -1;
break;
@@ -881,6 +882,8 @@ static struct dso_cache *dso_cache__populate(struct dso *dso,

if (dso->binary_type == DSO_BINARY_TYPE__BPF_PROG_INFO)
*ret = bpf_read(dso, cache_offset, cache->data);
+ else if (dso->binary_type == DSO_BINARY_TYPE__OOL)
+ *ret = DSO__DATA_CACHE_SIZE;
else
*ret = file_read(dso, machine, cache_offset, cache->data);

diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 2db64b79617a..b482453bc3d1 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -40,6 +40,7 @@ enum dso_binary_type {
DSO_BINARY_TYPE__GUEST_KCORE,
DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO,
DSO_BINARY_TYPE__BPF_PROG_INFO,
+ DSO_BINARY_TYPE__OOL,
DSO_BINARY_TYPE__NOT_FOUND,
};

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index c2825aaf3927..c7bb1aa81f3e 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -730,6 +730,12 @@ static int machine__process_ksymbol_register(struct machine *machine,
if (!map)
return -ENOMEM;

+ if (event->ksymbol.ksym_type == PERF_RECORD_KSYMBOL_TYPE_OOL) {
+ map->dso->binary_type = DSO_BINARY_TYPE__OOL;
+ map->dso->data.file_size = event->ksymbol.len;
+ dso__set_loaded(map->dso);
+ }
+
map->start = event->ksymbol.addr;
map->end = map->start + event->ksymbol.len;
maps__insert(&machine->kmaps, map);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index f67960bedebb..4ec8cfd3967e 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -267,6 +267,11 @@ bool __map__is_bpf_prog(const struct map *map)
return name && (strstr(name, "bpf_prog_") == name);
}

+bool __map__is_ool(const struct map *map)
+{
+ return map->dso && map->dso->binary_type == DSO_BINARY_TYPE__OOL;
+}
+
bool map__has_symbols(const struct map *map)
{
return dso__has_symbols(map->dso);
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 067036e8970c..9e312ae2d656 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -147,11 +147,12 @@ int map__set_kallsyms_ref_reloc_sym(struct map *map, const char *symbol_name,
bool __map__is_kernel(const struct map *map);
bool __map__is_extra_kernel_map(const struct map *map);
bool __map__is_bpf_prog(const struct map *map);
+bool __map__is_ool(const struct map *map);

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

bool map__has_symbols(const struct map *map);
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 3b379b1296f1..deb7f9bee3af 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1537,6 +1537,7 @@ static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod,
return true;

case DSO_BINARY_TYPE__BPF_PROG_INFO:
+ case DSO_BINARY_TYPE__OOL:
case DSO_BINARY_TYPE__NOT_FOUND:
default:
return false;
--
2.17.1