On Tue, Jan 16, 2018 at 12:27:33PM +0100, Hannes Reinecke wrote: > In general I'd rather have the tracepoints when actually submitting the > request; with this tracepoint we might be getting a trace which doesn't > really indicate if the command was submitted at all.
yes but if we really want to be 100% certain we need to take the tracepoints in either in blk_mq_dispatch_rq_list() and trace the return value of the respective ->queue_rq() or in the PCI/FC/RDMA drivers. -- Johannes Thumshirn Storage jthumsh...@suse.de +49 911 74053 689 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850