From 458999c6f67b0ffcc704a4892041dd700adf7d83 Mon Sep 17 00:00:00 2001 From: Tingwei Zhang Date: Mon, 5 Oct 2020 10:13:15 +0300 Subject: [PATCH] tracing: Add trace_export support for trace_marker Add the support to route trace_marker buffer to other destination via trace_export. Reviewed-by: Steven Rostedt (VMware) Reviewed-by: Alexander Shishkin Signed-off-by: Tingwei Zhang Signed-off-by: Alexander Shishkin Link: https://lore.kernel.org/r/20201005071319.78508-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- include/linux/trace.h | 1 + kernel/trace/trace.c | 9 +++++++++ 2 files changed, 10 insertions(+) diff --git a/include/linux/trace.h b/include/linux/trace.h index 86033d2..886a4ff 100644 --- a/include/linux/trace.h +++ b/include/linux/trace.h @@ -6,6 +6,7 @@ #define TRACE_EXPORT_FUNCTION BIT(0) #define TRACE_EXPORT_EVENT BIT(1) +#define TRACE_EXPORT_MARKER BIT(2) /* * The trace export - an export of Ftrace output. The trace_export diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a40ee41..6048fba 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -271,6 +271,7 @@ static struct trace_export __rcu *ftrace_exports_list __read_mostly; static DEFINE_STATIC_KEY_FALSE(trace_function_exports_enabled); static DEFINE_STATIC_KEY_FALSE(trace_event_exports_enabled); +static DEFINE_STATIC_KEY_FALSE(trace_marker_exports_enabled); static inline void ftrace_exports_enable(struct trace_export *export) { @@ -279,6 +280,9 @@ static inline void ftrace_exports_enable(struct trace_export *export) if (export->flags & TRACE_EXPORT_EVENT) static_branch_inc(&trace_event_exports_enabled); + + if (export->flags & TRACE_EXPORT_MARKER) + static_branch_inc(&trace_marker_exports_enabled); } static inline void ftrace_exports_disable(struct trace_export *export) @@ -288,6 +292,9 @@ static inline void ftrace_exports_disable(struct trace_export *export) if (export->flags & TRACE_EXPORT_EVENT) static_branch_dec(&trace_event_exports_enabled); + + if (export->flags & TRACE_EXPORT_MARKER) + static_branch_dec(&trace_marker_exports_enabled); } static void ftrace_exports(struct ring_buffer_event *event, int flag) @@ -6687,6 +6694,8 @@ tracing_mark_write(struct file *filp, const char __user *ubuf, } else entry->buf[cnt] = '\0'; + if (static_branch_unlikely(&trace_marker_exports_enabled)) + ftrace_exports(event, TRACE_EXPORT_MARKER); __buffer_unlock_commit(buffer, event); if (tt) -- 2.7.4