From 05a1f47ed47a83736aca117aeee96e926cc0dfd0 Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Thu, 16 Mar 2017 18:41:59 +0200 Subject: perf tools: Handle partial AUX records and print a warning This patch decodes the 'partial' flag in AUX records and prints a warning to the user, so that they don't have to guess why their PT traces contain gaps (or missing altogether): Warning: AUX data had gaps in it 8 times out of 8! Are you running a KVM guest in the background? Trying to be even more helpful, we will detect if the user's kvm driver sets up exclusive VMX root mode for the entire lifespan of the kvm process: Reloading kvm_intel module with vmm_exclusive=0 will reduce the gaps to only guest's timeslices. Note however, that you'll still have gaps in cpu-wide traces even with vmm_exclusive=0, but the number of gaps will be below 100% (as opposed to the above example). Currently this is the only reason for partial records. Signed-off-by: Alexander Shishkin Cc: Adrian Hunter Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Vince Weaver Link: http://lkml.kernel.org/r/8760j941ig.fsf@ashishki-desk.ger.corp.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/event.h | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/perf/util/event.h') diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h index e1d8166ebbd5..eb7a7b200737 100644 --- a/tools/perf/util/event.h +++ b/tools/perf/util/event.h @@ -276,6 +276,7 @@ struct events_stats { u64 total_lost; u64 total_lost_samples; u64 total_aux_lost; + u64 total_aux_partial; u64 total_invalid_chains; u32 nr_events[PERF_RECORD_HEADER_MAX]; u32 nr_non_filtered_samples; -- cgit