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Fri, 02 Jan 2026 04:16:01 -0800 (PST) Received: from ho-tower-lan.lan ([185.48.77.170]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43264613923sm69528886f8f.26.2026.01.02.04.15.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Jan 2026 04:16:00 -0800 (PST) From: James Clark Date: Fri, 02 Jan 2026 12:15:43 +0000 Subject: [PATCH] perf tools: Dump callchain context marker names Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260102-james-perf-dump-callchain-markers-v1-1-3a9bdec20c58@linaro.org> X-B4-Tracking: v=1; b=H4sIAO62V2kC/x2NQQqDMBAAvyJ7diEJrRW/UjykydpuNWnYRSlI/ t7Q48Awc4KSMClM3QlCByt/cgPbdxBePj8JOTYGZ9xgrHH49okUC8mCcU8Fg9+2ZnLG5GUlURw u0d6uD2vGMELrFKGFv//Hfa71BzsOtbdzAAAA To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Leo Yan Cc: linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, James Clark X-Mailer: b4 0.14.0 These are hard to interpret in the raw output because they are printed as hex but are defined in perf_event.h as decimal. Make it much easier to read the raw callchains by just printing their names. For example: $ perf report -D 1798195372321 0x4638 [0xb0]: PERF_RECORD_SAMPLE(IP, 0x4002): 44922/44922:= 0x7c8046dd3400 period: 120218 addr: 0 ... FP chain: nr:12 ..... 0: fffffffffffffe00 (PERF_CONTEXT_USER) ..... 1: 00007c8046dd3400 ..... 2: 00007c8046db86d3 Signed-off-by: James Clark Reviewed-by: Ian Rogers --- tools/perf/util/session.c | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 4236503c8f6c..e812f8954075 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -841,6 +841,26 @@ static void callchain__lbr_callstack_printf(struct per= f_sample *sample) } } =20 +static const char *callchain_context_str(u64 ip) +{ + switch (ip) { + case PERF_CONTEXT_HV: + return " (PERF_CONTEXT_HV)"; + case PERF_CONTEXT_KERNEL: + return " (PERF_CONTEXT_KERNEL)"; + case PERF_CONTEXT_USER: + return " (PERF_CONTEXT_USER)"; + case PERF_CONTEXT_GUEST: + return " (PERF_CONTEXT_GUEST)"; + case PERF_CONTEXT_GUEST_KERNEL: + return " (PERF_CONTEXT_GUEST_KERNEL)"; + case PERF_CONTEXT_GUEST_USER: + return " (PERF_CONTEXT_GUEST_USER)"; + default: + return ""; + } +} + static void callchain__printf(struct evsel *evsel, struct perf_sample *sample) { @@ -853,8 +873,9 @@ static void callchain__printf(struct evsel *evsel, printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr); =20 for (i =3D 0; i < callchain->nr; i++) - printf("..... %2d: %016" PRIx64 "\n", - i, callchain->ips[i]); + printf("..... %2d: %016" PRIx64 "%s\n", + i, callchain->ips[i], + callchain_context_str(callchain->ips[i])); =20 if (sample->deferred_callchain) printf("...... (deferred)\n"); --- base-commit: cbd41c6d4c26c161a2b0e70ad411d3885ff13507 change-id: 20260102-james-perf-dump-callchain-markers-64d175b108c8 Best regards, --=20 James Clark