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commit a5ecda79870b41f5b2ee21975f0f1c931114d258
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Author: sangamesh <sragate@vols.utk.edu>
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Date: Thu Jun 11 17:48:36 2015 -0400
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Thanks to William Cohen for the patch which does the following:
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Checking the cpu family and module number is not sufficient to determine
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whether RAPL can be used. If the papi is running inside a guest VM,
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the MSR used by the PAPI RAPL component may not be available. There
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should be a simple read test to verify the RAPL MSR registers are
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available. This allows the component to more clearly report that RAPL
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is unsupported rather than just exiting program when the RAPL
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diff --git a/src/components/rapl/linux-rapl.c b/src/components/rapl/linux-rapl.c
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index f0d376e..8dff3fe 100644
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--- a/src/components/rapl/linux-rapl.c
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+++ b/src/components/rapl/linux-rapl.c
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@@ -447,6 +447,13 @@ _rapl_init_component( int cidx )
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return PAPI_ESYS;
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}
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+ /* Verify needed MSR is readable. In a guest VM it may not be readable*/
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+ if (pread(fd, &result, sizeof result, MSR_RAPL_POWER_UNIT) != sizeof result ) {
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+ strncpy(_rapl_vector.cmp_info.disabled_reason,
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+ "Unable to access RAPL registers",PAPI_MAX_STR_LEN);
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+ return PAPI_ESYS;
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+ }
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+
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/* Calculate the units used */
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result=read_msr(fd,MSR_RAPL_POWER_UNIT);
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