(urgh, apologies for the html) We use io_start_time_ns in dm-mpath.c, but the only actual user is historical-service-time currently. We need blk_stat_enable_accounting()/blk_stat_disable_accounting() calls somewhere. I was considering adding a new multipath feature flag, but we already have "DM_PS_USE_HR_TIMER", which seems similar in spirit. Would that re-use make sense? Khazhy
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