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Commit bfd45118 authored by Simon Kaempflein's avatar Simon Kaempflein Committed by Ingo Molnar
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perf record, x86: Print more intelligent error message when sampling fails 



Print more accurate error message when "perf record" fails because
there is no APIC support, on x86.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 81516c5f

tools/perf/builtin-record.c

+6 −0
Original line number Diff line number Diff line
@@ -307,6 +307,12 @@ static void create_counter(int counter, int cpu, pid_t pid) 
		printf("\n");

		error("perfcounter syscall returned with %d (%s)\n",

			fd[nr_cpu][counter], strerror(err));



#if defined(__i386__) || defined(__x86_64__)

		if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)

			die("No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.\n");

#endif



		die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");

		exit(-1);

	}