From: Adrian Hunter <adrian.hunter@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Heiko Carstens <hca@linux.ibm.com>,
Thomas Richter <tmricht@linux.ibm.com>,
Hendrik Brueckner <brueckner@linux.ibm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>,
James Clark <james.clark@arm.com>,
coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
Yicong Yang <yangyicong@hisilicon.com>,
Jonathan Cameron <jonathan.cameron@huawei.com>,
Will Deacon <will@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Ian Rogers <irogers@google.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org
Subject: [PATCH V4 10/11] perf intel-pt: Add documentation for pause / resume
Date: Thu, 11 Jan 2024 10:19:13 +0200 [thread overview]
Message-ID: <20240111081914.3123-11-adrian.hunter@intel.com> (raw)
In-Reply-To: <20240111081914.3123-1-adrian.hunter@intel.com>
Document the use of aux-action config term and provide a simple example.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/Documentation/perf-intel-pt.txt | 70 ++++++++++++++++++++++
1 file changed, 70 insertions(+)
diff --git a/tools/perf/Documentation/perf-intel-pt.txt b/tools/perf/Documentation/perf-intel-pt.txt
index b3d9fb29ffd3..3a0d73bf8bc2 100644
--- a/tools/perf/Documentation/perf-intel-pt.txt
+++ b/tools/perf/Documentation/perf-intel-pt.txt
@@ -551,6 +551,9 @@ Support for this feature is indicated by:
which contains "1" if the feature is supported and
"0" otherwise.
+*aux-action=start-paused*::
+Start tracing paused, refer to the section <<_pause_or_resume_tracing,Pause or Resume Tracing>>
+
config terms on other events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -566,6 +569,9 @@ and PEBS-via-PT. In those cases, the other events can have config terms below:
Used to select PEBS-via-PT, refer to the
section <<_pebs_via_intel_pt,PEBS via Intel PT>>
+*aux-action*::
+ Used to pause or resume tracing, refer to the section
+ <<_pause_or_resume_tracing,Pause or Resume Tracing>>
AUX area sampling option
~~~~~~~~~~~~~~~~~~~~~~~~
@@ -1911,6 +1917,70 @@ For pipe mode, the order of events and timestamps can presumably
be messed up.
+Pause or Resume Tracing
+-----------------------
+
+With newer Kernels, it is possible to use other selected events to pause
+or resume Intel PT tracing. This is configured by using the "aux-action"
+config term:
+
+"aux-action=pause" is used with events that are to pause Intel PT tracing.
+
+"aux-action=resume" is used with events that are to resume Intel PT tracing.
+
+"aux-action=start-paused" is used with the Intel PT event to start in a
+paused state.
+
+For example, to trace only the uname system call (sys_newuname) when running the
+command line utility uname:
+
+ $ perf record --kcore -e intel_pt/aux-action=start-paused/k,syscalls:sys_enter_newuname/aux-action=resume/,syscalls:sys_exit_newuname/aux-action=pause/ uname
+ Linux
+ [ perf record: Woken up 1 times to write data ]
+ [ perf record: Captured and wrote 0.043 MB perf.data ]
+ $ perf script --call-trace
+ uname 30805 [000] 24001.058782799: name: 0x7ffc9c1865b0
+ uname 30805 [000] 24001.058784424: psb offs: 0
+ uname 30805 [000] 24001.058784424: cbr: 39 freq: 3904 MHz (139%)
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) debug_smp_processor_id
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) __x64_sys_newuname
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) down_read
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) __cond_resched
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) preempt_count_add
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) in_lock_functions
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) preempt_count_sub
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) up_read
+ uname 30805 [000] 24001.058784629: ([kernel.kallsyms]) preempt_count_add
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) in_lock_functions
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) preempt_count_sub
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) _copy_to_user
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) syscall_exit_to_user_mode
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) syscall_exit_work
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) perf_syscall_exit
+ uname 30805 [000] 24001.058784838: ([kernel.kallsyms]) debug_smp_processor_id
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_trace_buf_alloc
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_swevent_get_recursion_context
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) debug_smp_processor_id
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) debug_smp_processor_id
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_tp_event
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_trace_buf_update
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) tracing_gen_ctx_irq_test
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_swevent_event
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) __perf_event_account_interrupt
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) __this_cpu_preempt_check
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_event_output_forward
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) perf_event_aux_pause
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) ring_buffer_get
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) __rcu_read_lock
+ uname 30805 [000] 24001.058785046: ([kernel.kallsyms]) __rcu_read_unlock
+ uname 30805 [000] 24001.058785254: ([kernel.kallsyms]) pt_event_stop
+ uname 30805 [000] 24001.058785254: ([kernel.kallsyms]) debug_smp_processor_id
+ uname 30805 [000] 24001.058785254: ([kernel.kallsyms]) debug_smp_processor_id
+ uname 30805 [000] 24001.058785254: ([kernel.kallsyms]) native_write_msr
+ uname 30805 [000] 24001.058785463: ([kernel.kallsyms]) native_write_msr
+ uname 30805 [000] 24001.058785639: 0x0
+
+
EXAMPLE
-------
--
2.34.1
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next prev parent reply other threads:[~2024-01-11 8:20 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-11 8:19 [PATCH V4 00/11] perf/core: Add ability for an event to "pause" or "resume" AUX area tracing Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 01/11] perf/core: Add aux_pause, aux_resume, aux_start_paused Adrian Hunter
2024-01-19 21:40 ` Namhyung Kim
2024-01-23 10:09 ` Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 02/11] perf/x86/intel/pt: Add support for pause / resume Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 03/11] perf tools: Enable evsel__is_aux_event() to work for ARM/ARM64 Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 04/11] perf tools: Enable evsel__is_aux_event() to work for S390_CPUMSF Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 05/11] perf tools: Add aux_start_paused, aux_pause and aux_resume Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 06/11] perf tools: Add aux-action config term Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 07/11] perf tools: Parse aux-action Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 08/11] perf tools: Add missing_features for aux_start_paused, aux_pause, aux_resume Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 09/11] perf intel-pt: Improve man page format Adrian Hunter
2024-01-11 8:19 ` Adrian Hunter [this message]
2024-01-16 11:15 ` [PATCH V4 10/11] perf intel-pt: Add documentation for pause / resume Andi Kleen
2024-01-16 12:22 ` Adrian Hunter
2024-01-19 21:28 ` Namhyung Kim
2024-01-22 10:07 ` Adrian Hunter
2024-01-11 8:19 ` [PATCH V4 11/11] perf intel-pt: Add a test " Adrian Hunter
2024-01-29 12:48 ` [PATCH V4 00/11] perf/core: Add ability for an event to "pause" or "resume" AUX area tracing Adrian Hunter
2024-01-31 16:53 ` Ian Rogers
2024-02-01 16:29 ` James Clark
2024-02-08 11:40 ` Adrian Hunter
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