From: Mike Leach <mike.leach@linaro.org>
To: linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org,
linux-kernel@vger.kernel.org, acme@kernel.org
Cc: peterz@infradead.org, mingo@redhat.com,
Mike Leach <mike.leach@linaro.org>,
mathieu.poirier@linaro.org, suzuki.poulose@arm.com
Subject: [PATCH v4 0/1] perf: cs_etm: Allow no sink on command line.
Date: Tue, 26 May 2020 11:53:09 +0100 [thread overview]
Message-ID: <20200526105310.9706-1-mike.leach@linaro.org> (raw)
Currently starting CoreSight tracing using perf requires a sink selection
on the command line:-
sudo ./perf record -e cs_etm/@tmc_etr0/ --per-thread uname -a
Not providing the @<sink> here results in an error and no trace produced.
After this set (alongside the CoreSight change set [1]) the infrastructure
will be able to select a default sink:-
sudo ./perf record -e cs_etm// --per-thread uname -a
This matches with the default operation provided with perf and intelpt.
This patch removes the check that a sink value is provided on the command
line with a NULL value passed to the CoreSight infrastructure if omitted.
Note: If this set is applied to a system without [1], then the effect is
benign as the existing CoreSight infrastructure will detect the error and
refuse to trace.
Applies to Linux coresight/next branch
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2020-May/734854.html
Changes since v3:
1) Removed RFC designation and distributed to wider audience.
2) Split set into perf user runtime (this set), and CoreSight driver code.
Mike Leach (1):
perf: cs-etm: Allow no CoreSight sink to be specified on command line
tools/perf/arch/arm/util/cs-etm.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--
2.17.1
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next reply other threads:[~2020-05-26 10:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 10:53 Mike Leach [this message]
2020-05-26 10:53 ` [PATCH v4 1/1] perf: cs-etm: Allow no CoreSight sink to be specified on command line Mike Leach
2020-06-04 21:21 ` Mathieu Poirier
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