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Date: Thu, 13 Aug 2020 09:45:46 +0800 From: Tingwei Zhang <tingwei@...eaurora.org> To: Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com>, Mathieu Poirier <mathieu.poirier@...aro.org>, Suzuki K Poulose <suzuki.poulose@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com> Cc: Tingwei Zhang <tingwei@...eaurora.org>, tsoni@...eaurora.org, Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>, Mao Jinlong <jinlmao@...eaurora.org>, linux-kernel@...r.kernel.org, coresight@...ts.linaro.org Subject: [PATCH v3 0/6] tracing: export event trace and trace_marker Ftrace has ability to export trace packets to other destination. Currently, only function trace can be exported. This series extends the support to event trace and trace_maker. STM is one possible destination to export ftrace. Use separate channel for each CPU to avoid mixing up packets from different CPUs together. Change from v2: Change flag definition to BIT(). (Steven) Add comment in stm_ftrace_write() to clarify it's safe to use smp_processor_id() here since preempt is disabled. (Steven) Change from v1: All changes are suggested by Steven Rostedt. User separate flag to control function trace, event trace and trace mark. Allocate channels according to num_possible_cpu() dynamically. Move ftrace_exports routines up so all ftrace can use them. Tingwei Zhang (6): stm class: ftrace: change dependency to TRACING tracing: add flag to control different traces tracing: add trace_export support for event trace tracing: add trace_export support for trace_marker stm class: ftrace: enable supported trace export flag stm class: ftrace: use different channel accroding to CPU drivers/hwtracing/stm/Kconfig | 2 +- drivers/hwtracing/stm/ftrace.c | 7 +- include/linux/trace.h | 7 + kernel/trace/trace.c | 270 ++++++++++++++++++--------------- 4 files changed, 159 insertions(+), 127 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
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