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Handle the case when the aux buffer is going to be full and data needs to be written to the data file. perf_aux_output_begin() function checks if there is enough space depending on the values of aux_wakeup and aux_watermark which is part of "struct perf_buffer". Inorder to maintain where to write to aux buffer, add two fields to "struct vpa_pmu_buf". Field "threshold" to indicate total possible DTL entries that can be contained in aux buffer and field "full" to indicate anytime when buffer is full. In perf_aux_output_end, there is check to see if wake up is needed based on aux head value. In vpa_dtl_capture_aux(), check if there is enough space to contain the DTL data. If not, save the data for available memory and set full to true. Set head of private aux to zero when buffer is full so that next data will be copied to beginning of the buffer. The address used for copying to aux is "aux_copy_buf + buf->head". So once buffer is full, set head to zero, so that next time it will be written from start of the buffer. Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com> Tested-by: Tejas Manhas <tejas05@linux.ibm.com> Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20250915102947.26681-7-atrajeev@linux.ibm.com