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The kernel can be compiled without support for any memory.swap.* files, or it can be disabled at boot time with the 'swapaccount=0' boot parameter, so if the file doesn't exist log warning indicating the kernel doesn't support the file and the user may need to try using the 'swapaccount=1' boot param. Note that the actual error from the call to fopen() is ENOENT, but that is translated into ENODATA in cg_get_attribute_as_uint64()