@@ -29,17 +29,7 @@
#include "trace-event.h"
#include "stat.h"
-static struct {
- bool sample_id_all;
- bool exclude_guest;
- bool mmap2;
- bool cloexec;
- bool clockid;
- bool clockid_wrong;
- bool lbr_flags;
- bool write_backward;
-} perf_missing_features;
-
+struct perf_missing_features perf_missing_features;
static clockid_t clockid;
static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
@@ -684,8 +674,11 @@ static void apply_config_terms(struct perf_evsel *evsel,
* possible to set overwrite globally, without config
* terms.
*/
- if (evsel->overwrite)
+ if (evsel->overwrite) {
+ WARN_ONCE(perf_missing_features.write_backward,
+ "Reading from overwrite event is not supported by this kernel\n");
attr->write_backward = 1;
+ }
/* User explicitly set per-event callgraph, clear the old setting and reset. */
if ((callgraph_buf != NULL) || (dump_size > 0)) {
@@ -11,6 +11,19 @@
#include "cpumap.h"
#include "counts.h"
+struct perf_missing_features {
+ bool sample_id_all;
+ bool exclude_guest;
+ bool mmap2;
+ bool cloexec;
+ bool clockid;
+ bool clockid_wrong;
+ bool lbr_flags;
+ bool write_backward;
+};
+
+extern struct perf_missing_features perf_missing_features;
+
struct perf_evsel;
/*
@@ -90,6 +90,11 @@ static void perf_probe_context_switch(struct perf_evsel *evsel)
evsel->attr.context_switch = 1;
}
+static void perf_probe_write_backward(struct perf_evsel *evsel)
+{
+ evsel->attr.write_backward = 1;
+}
+
bool perf_can_sample_identifier(void)
{
return perf_probe_api(perf_probe_sample_identifier);
@@ -129,6 +134,17 @@ bool perf_can_record_cpu_wide(void)
return true;
}
+static void perf_check_write_backward(void)
+{
+ static bool checked = false;
+
+ if (!checked) {
+ perf_missing_features.write_backward =
+ !perf_probe_api(perf_probe_write_backward);
+ checked = true;
+ }
+}
+
void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts,
struct callchain_param *callchain)
{
@@ -136,6 +152,7 @@ void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts,
bool use_sample_identifier = false;
bool use_comm_exec;
+ perf_check_write_backward();
/*
* Set the evsel leader links before we configure attributes,
* since some might depend on this info.
Before this patch, when using overwritable ring buffer on an old kernel, error message is misleading: # ~/perf record -m 1 -e raw_syscalls:*/overwrite/ -a Error: The raw_syscalls:sys_enter event is not supported. This patch output clear error message to tell user his/her kernel is too old: # ~/perf record -m 1 -e raw_syscalls:*/overwrite/ -a Reading from overwrite event is not supported by this kernel Error: The raw_syscalls:sys_enter event is not supported. Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: He Kuang <hekuang@huawei.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com --- tools/perf/util/evsel.c | 17 +++++------------ tools/perf/util/evsel.h | 13 +++++++++++++ tools/perf/util/record.c | 17 +++++++++++++++++ 3 files changed, 35 insertions(+), 12 deletions(-) -- 1.8.3.4