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perf tools: Fix perf record as non root with kptr_restrict == 1 

Currently perf record always errors out when you run it as non-root with
kptr_restrict == 1, which is often the default.

Make it only warn instead and fix the kernel resolve code to not
segfault later. Profiling works still fine, except kernel symbols are
not resolved.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1411594794-7229-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
hifive-unleashed-5.1
Andi Kleen 2014-09-24 14:39:54 -07:00 committed by Arnaldo Carvalho de Melo
parent da88c7f78d
commit a5c2a4c956
2 changed files with 7 additions and 3 deletions
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8
tools/perf/util/event.c
View File

@ -558,13 +558,17 @@ int perf_event__synthesize_kernel_mmap(struct perf_tool *tool,
struct map *map;
struct kmap *kmap;
int err;
union perf_event *event;
if (machine->vmlinux_maps[0] == NULL)
return -1;
/*
* We should get this from /sys/kernel/sections/.text, but till that is
* available use this, and after it is use this as a fallback for older
* kernels.
*/
union perf_event *event = zalloc((sizeof(event->mmap) +
machine->id_hdr_size));
event = zalloc((sizeof(event->mmap) + machine->id_hdr_size));
if (event == NULL) {
pr_debug("Not enough memory synthesizing mmap event "
"for kernel modules\n");

2
tools/perf/util/session.c
View File

@ -119,7 +119,7 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
* kernel MMAP event, in perf_event__process_mmap().
*/
if (perf_session__create_kernel_maps(session) < 0)
goto out_delete;
pr_warning("Cannot read kernel map\n");
}
if (tool && tool->ordering_requires_timestamps &&