All of lore.kernel.org
 help / color / mirror / Atom feed
From: James Clark <james.clark@arm.com>
To: acme@kernel.org, mathieu.poirier@linaro.org,
	coresight@lists.linaro.org, linux-perf-users@vger.kernel.org
Cc: leo.yan@linaro.org, suzuki.poulose@arm.com,
	mike.leach@linaro.org, James Clark <james.clark@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	John Garry <john.garry@huawei.com>, Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 5/6] perf cs-etm: Improve Coresight zero timestamp warning
Date: Thu, 29 Jul 2021 16:58:04 +0100	[thread overview]
Message-ID: <20210729155805.2830-6-james.clark@arm.com> (raw)
In-Reply-To: <20210729155805.2830-1-james.clark@arm.com>

Only show the warning if the user hasn't already set timeless mode and
improve the text because there was ambiguity around the meaning of '...'

Change the warning to a UI warning instead of printing straight to
stderr because this corrupts the UI when perf report TUI is used. The UI
warning function also handles printing to stderr when in perf script
mode.

Suggested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
---
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
index 3e1a05bc82cc..5084bd2ca6eb 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -324,8 +324,11 @@ cs_etm_decoder__do_hard_timestamp(struct cs_etm_queue *etmq,
 		 * underflow.
 		 */
 		packet_queue->cs_timestamp = 0;
-		WARN_ONCE(true, "Zero Coresight timestamp found at Idx:%" OCSD_TRC_IDX_STR
-				". Decoding may be improved with --itrace=Z...\n", indx);
+		if (!cs_etm__etmq_is_timeless(etmq))
+			pr_warning_once("Zero Coresight timestamp found at Idx:%" OCSD_TRC_IDX_STR
+					". Decoding may be improved by prepending 'Z' to your current --itrace arguments.\n",
+					indx);
+
 	} else if (packet_queue->instr_count > elem->timestamp) {
 		/*
 		 * Sanity check that the elem->timestamp - packet_queue->instr_count would not
-- 
2.28.0


WARNING: multiple messages have this Message-ID (diff)
From: James Clark <james.clark@arm.com>
To: acme@kernel.org, mathieu.poirier@linaro.org,
	coresight@lists.linaro.org, linux-perf-users@vger.kernel.org
Cc: leo.yan@linaro.org, suzuki.poulose@arm.com,
	mike.leach@linaro.org, James Clark <james.clark@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	John Garry <john.garry@huawei.com>, Will Deacon <will@kernel.org>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 5/6] perf cs-etm: Improve Coresight zero timestamp warning
Date: Thu, 29 Jul 2021 16:58:04 +0100	[thread overview]
Message-ID: <20210729155805.2830-6-james.clark@arm.com> (raw)
In-Reply-To: <20210729155805.2830-1-james.clark@arm.com>

Only show the warning if the user hasn't already set timeless mode and
improve the text because there was ambiguity around the meaning of '...'

Change the warning to a UI warning instead of printing straight to
stderr because this corrupts the UI when perf report TUI is used. The UI
warning function also handles printing to stderr when in perf script
mode.

Suggested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: James Clark <james.clark@arm.com>
---
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
index 3e1a05bc82cc..5084bd2ca6eb 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -324,8 +324,11 @@ cs_etm_decoder__do_hard_timestamp(struct cs_etm_queue *etmq,
 		 * underflow.
 		 */
 		packet_queue->cs_timestamp = 0;
-		WARN_ONCE(true, "Zero Coresight timestamp found at Idx:%" OCSD_TRC_IDX_STR
-				". Decoding may be improved with --itrace=Z...\n", indx);
+		if (!cs_etm__etmq_is_timeless(etmq))
+			pr_warning_once("Zero Coresight timestamp found at Idx:%" OCSD_TRC_IDX_STR
+					". Decoding may be improved by prepending 'Z' to your current --itrace arguments.\n",
+					indx);
+
 	} else if (packet_queue->instr_count > elem->timestamp) {
 		/*
 		 * Sanity check that the elem->timestamp - packet_queue->instr_count would not
-- 
2.28.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2021-07-29 16:01 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 15:57 [RFC PATCH 0/6] perf tools: Warning fixes James Clark
2021-07-29 15:57 ` James Clark
2021-07-29 15:58 ` [RFC PATCH 1/6] perf tools: Add WARN_ONCE equivalent for UI warnings James Clark
2021-07-29 15:58   ` James Clark
2021-08-02 14:44   ` Arnaldo Carvalho de Melo
2021-08-02 14:44     ` Arnaldo Carvalho de Melo
2021-07-29 15:58 ` [RFC PATCH 2/6] perf tools: Re-add annotate_warned functionality James Clark
2021-07-29 15:58   ` James Clark
2021-07-29 15:58 ` [RFC PATCH 3/6] perf tools: Add disassembly warnings for annotate --stdio James Clark
2021-07-29 15:58   ` James Clark
2021-07-29 15:58 ` [RFC PATCH 4/6] perf tools: Add flag for tracking warnings of missing DSOs James Clark
2021-07-29 15:58   ` James Clark
2021-07-29 15:58 ` James Clark [this message]
2021-07-29 15:58   ` [RFC PATCH 5/6] perf cs-etm: Improve Coresight zero timestamp warning James Clark
2021-08-02 15:17   ` Leo Yan
2021-08-02 15:17     ` Leo Yan
2021-08-03 13:25     ` Arnaldo Carvalho de Melo
2021-08-03 13:25       ` Arnaldo Carvalho de Melo
2021-07-29 15:58 ` [RFC PATCH 6/6] perf cs-etm: Add warnings for missing DSOs James Clark
2021-07-29 15:58   ` James Clark
2021-08-02 14:51   ` Arnaldo Carvalho de Melo
2021-08-02 14:51     ` Arnaldo Carvalho de Melo
2021-08-02 17:03     ` Mathieu Poirier
2021-08-02 17:03       ` Mathieu Poirier
2021-08-03  8:06       ` Mike Leach
2021-08-03  8:06         ` Mike Leach
2021-08-02 15:41   ` Leo Yan
2021-08-02 15:41     ` Leo Yan
2021-08-03 13:24     ` Arnaldo Carvalho de Melo
2021-08-03 13:24       ` Arnaldo Carvalho de Melo
2021-08-03 14:01       ` Leo Yan
2021-08-03 14:01         ` Leo Yan
2021-08-05 12:59         ` James Clark
2021-08-05 12:59           ` James Clark
2021-08-06 18:36           ` Arnaldo Carvalho de Melo
2021-08-06 18:36             ` Arnaldo Carvalho de Melo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210729155805.2830-6-james.clark@arm.com \
    --to=james.clark@arm.com \
    --cc=acme@kernel.org \
    --cc=alexander.shishkin@linux.intel.com \
    --cc=coresight@lists.linaro.org \
    --cc=john.garry@huawei.com \
    --cc=jolsa@redhat.com \
    --cc=leo.yan@linaro.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-perf-users@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=mathieu.poirier@linaro.org \
    --cc=mike.leach@linaro.org \
    --cc=namhyung@kernel.org \
    --cc=suzuki.poulose@arm.com \
    --cc=will@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.