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From: Adrian Hunter <adrian.hunter@intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>, Andi Kleen <ak@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 09/11] perf intel-pt: Adjust sample flags for VM-Exit
Date: Thu, 18 Feb 2021 11:57:59 +0200	[thread overview]
Message-ID: <20210218095801.19576-10-adrian.hunter@intel.com> (raw)
In-Reply-To: <20210218095801.19576-1-adrian.hunter@intel.com>

Use the change of NR to detect whether an asynchronous branch is a VM-Exit.

Note VM-Entry is determined from the vmlaunch or vmresume instruction,
in which case, sample flags will show "VMentry" even if the VM-Entry fails.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 tools/perf/util/intel-pt.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c
index 546d512b300a..cafb3943d5f6 100644
--- a/tools/perf/util/intel-pt.c
+++ b/tools/perf/util/intel-pt.c
@@ -1201,13 +1201,16 @@ static void intel_pt_sample_flags(struct intel_pt_queue *ptq)
 	if (ptq->state->flags & INTEL_PT_ABORT_TX) {
 		ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_TX_ABORT;
 	} else if (ptq->state->flags & INTEL_PT_ASYNC) {
-		if (ptq->state->to_ip)
+		if (!ptq->state->to_ip)
+			ptq->flags = PERF_IP_FLAG_BRANCH |
+				     PERF_IP_FLAG_TRACE_END;
+		else if (ptq->state->from_nr && !ptq->state->to_nr)
+			ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL |
+				     PERF_IP_FLAG_VMEXIT;
+		else
 			ptq->flags = PERF_IP_FLAG_BRANCH | PERF_IP_FLAG_CALL |
 				     PERF_IP_FLAG_ASYNC |
 				     PERF_IP_FLAG_INTERRUPT;
-		else
-			ptq->flags = PERF_IP_FLAG_BRANCH |
-				     PERF_IP_FLAG_TRACE_END;
 		ptq->insn_len = 0;
 	} else {
 		if (ptq->state->from_ip)
-- 
2.17.1


  parent reply	other threads:[~2021-02-18 11:35 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-18  9:57 [PATCH 00/11] perf intel-pt: Add limited support for tracing guest kernels Adrian Hunter
2021-02-18  9:57 ` [PATCH 01/11] perf script: Add branch types for VM-Entry and VM-Exit Adrian Hunter
2021-02-18  9:57 ` [PATCH 02/11] perf intel_pt: Add vmlaunch and vmresume as branches Adrian Hunter
2021-02-18  9:57 ` [PATCH 03/11] perf intel-pt: Retain the last PIP packet payload as is Adrian Hunter
2021-02-18  9:57 ` [PATCH 04/11] perf intel-pt: Amend decoder to track the NR flag Adrian Hunter
2021-02-18  9:57 ` [PATCH 05/11] perf machine: Factor out machines__find_guest() Adrian Hunter
2021-02-18  9:57 ` [PATCH 06/11] perf machine: Factor out machine__idle_thread() Adrian Hunter
2021-02-18  9:57 ` [PATCH 07/11] perf intel-pt: Support decoding of guest kernel Adrian Hunter
2021-02-18  9:57 ` [PATCH 08/11] perf intel-pt: Allow for a guest kernel address filter Adrian Hunter
2021-02-18  9:57 ` Adrian Hunter [this message]
2021-02-18  9:58 ` [PATCH 10/11] perf intel-pt: Split VM-Entry and VM-Exit branches Adrian Hunter
2021-02-18  9:58 ` [PATCH 11/11] perf intel-pt: Add documentation for tracing virtual machines Adrian Hunter
2021-02-18 18:24 ` [PATCH 00/11] perf intel-pt: Add limited support for tracing guest kernels Andi Kleen

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