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: Ingo Molnar <mingo@elte.hu>
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@ -307,6 +307,12 @@ try_again:
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printf("\n");
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error("perfcounter syscall returned with %d (%s)\n",
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fd[nr_cpu][counter], strerror(err));
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#if defined(__i386__) || defined(__x86_64__)
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if (attr->type == PERF_TYPE_HARDWARE && err == EOPNOTSUPP)
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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");
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#endif
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die("No CONFIG_PERF_EVENTS=y kernel support configured?\n");
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exit(-1);
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}
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