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Date: Fri, 21 Mar 2014 01:19:00 -0400 From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, Mathieu Desnoyers <mathieu.desnoyers@...icios.com> Subject: [PATCH v7 0/2] Tracepoint API simplification/cleanup Here is v7 of the tracepoint register/unregister API simplification, submitted for 3.15. Changes since v1: - Adapt ftrace/perf callers, - Update tracepoint.h macro, - Build tested. Changes since v2: - Introduce for_each_tracepoint() iterator to allow listing the currently loaded tracepoints, for modules using coming/going notifiers to track tracepoints. Changes since v3: - Introduce module coming and going notifiers each with their own priority to ensure that other coming notifiers are called after, and coming notifiers are called before the tracepoint notifiers. - Fix: move for_each_tracepoint() outside of the CONFIG_MODULE ifdef. Changes since v4: - Split tracepoints_mutex into two locks: tp_modlist_mutex, which protects the tracepoint list of modules, and a tracepoint_mutex, which protects the tracepoints per se. tracepoint_mutex nests inside tp_modlist_mutex. - Introduce a tracepoint module notifier, to ensure consistency between iteration on tracepoints with for_each_tracepoint() and module coming and going notifications. This consistency is ensured by holding tp_modlist_mutex when calling the notifier and when iterating on the tracepoint module list. Changes since v5: - Remove tracepoint_add_old_probes within "Tracepoint cleanup: remove unused API functions" rather than in later patch. - Remove struct tp_probes "old probes" list within "Tracepoint cleanup: remove unused API functions", as it is not needed anymore. - Within "Tracepoint cleanup: remove unused API functions", simply add the new module to tail of list, since there is no need to keep it ordered anymore. Changes since v6: - Remove unused struct list_head list from struct tp_probes in patch "Tracepoint: register/unregister struct tracepoint", - Rename for_each_tracepoint() to for_each_kernel_tracepoint(). Only iterate on kernel tracepoints, - Registered tracepoint module notifiers now receive struct tp_module pointer rather than struct module pointer, - register_tracepoint_module_notifier and unregister_tracepoint_module_notifier now iterate on all modules and call coming/going notifiers. This ensures notifier registration and listing of already loaded modules are done atomically (protected by tp_modlist_mutex). Thanks! Mathieu Mathieu Desnoyers (2): Tracepoint cleanup: remove unused API functions Tracepoint: register/unregister struct tracepoint include/linux/ftrace_event.h | 1 + include/linux/tracepoint.h | 60 ++-- include/trace/ftrace.h | 2 + kernel/trace/trace_events.c | 8 +- kernel/tracepoint.c | 705 ++++++++++++++---------------------------- 5 files changed, 260 insertions(+), 516 deletions(-) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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