perf tools: Fix perf record as non root with kptr_restrict == 1 (a5c2a4c9) · Commits · 戴 / test

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>

tools/perf/util/event.c

+6 −2

Original line number	Diff line number	Diff line
		@@ -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");

tools/perf/util/session.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 &&

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