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Ftrace is currently not able to detect when SWIOTLB has to do double buffering under Xen. You can only see it indirectly in function_graph, when xen_swiotlb_map_page() doesn't stop after range_straddles_page_boundary(), but calls spinlock functions, memcpy() and xen_phys_to_bus() as well. This patch introduces the swiotlb-xen:bounced event, which also prints out the following informations to help you find out why bouncing happened...

Ftrace is currently not able to detect when SWIOTLB has to do double buffering under Xen. You can only see it indirectly in function_graph, when xen_swiotlb_map_page() doesn't stop after range_straddles_page_boundary(), but calls spinlock functions, memcpy() and xen_phys_to_bus() as well. This patch introduces the swiotlb-xen:bounced event, which also prints out the following informations to help you find out why bouncing happened...

Ftrace is currently not able to detect when SWIOTLB has to do double buffering under Xen. You can only see it indirectly in function_graph, when xen_swiotlb_map_page() doesn't stop after range_straddles_page_boundary(), but calls spinlock functions, memcpy() and xen_phys_to_bus() as well. This patch introduces the swiotlb-xen:bounced event, which also prints out the following informations to help you find out why bouncing happened...

Ftrace is currently not able to detect when SWIOTLB has to do double buffering. Under Xen you can only see it indirectly in function_graph, when xen_swiotlb_map_page() doesn't stop after range_straddles_page_boundary(), but calls spinlock functions, memcpy() and xen_phys_to_bus() as well. This patch introduces the swiotlb:swiotlb_bounced event, which also prints out the following informations to help you find out why bouncing happ...

Ftrace is currently not able to detect when SWIOTLB has to do double buffering. Under Xen you can only see it indirectly in function_graph, when xen_swiotlb_map_page() doesn't stop after range_straddles_page_boundary(), but calls spinlock functions, memcpy() and xen_phys_to_bus() as well. This patch introduces the swiotlb:swiotlb_bounced event, which also prints out the following informations to help you find out why bouncing happ...

Ftrace is currently not able to detect when SWIOTLB has to do double buffering. Under Xen you can only see it indirectly in function_graph, when xen_swiotlb_map_page() doesn't stop after range_straddles_page_boundary(), but calls spinlock functions, memcpy() and xen_phys_to_bus() as well. This patch introduces the swiotlb:swiotlb_bounced event, which also prints out the following informations to help you find out why bouncing happ...

...] Testing tracer sched_switch: PASSED [ 1.396782] Testing tracer sysprof: PASSED [ 1.504844] Testing tracer function: PASSED [ 1.617431] Testing tracer irqsoff: PASSED [ 1.621818] Testing tracer wakeup: PASSED [ 1.936759] Testing tracer wakeup_rt: PASSED [ 2.248770] Testing tracer function_graph: <3>BUG: scheduling while atomic: swapper/1/0xdf803480 [ 2.253478] BUG: unable to handle kernel paging request at 3e87ab40 [ 2.253478] IP: [<c0107f29>] xen_iret+0x15/0x2b [ 2.253478] *pdpt = 000000003c813001 [ 2.253478] Thread overran stack, or stack corrupted [ 2.253478...