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FROMLIST: tracing: add trace_export support for trace_marker

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Add the support to route trace_marker buffer to other destination
via trace_export.

Bug: 160464759
Link: https://lore.kernel.org/patchwork/cover/1280618/
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Change-Id: I870f1902e48d05947667ac0ecda7a9d17a982890
This commit is contained in:
Tingwei Zhang 2020-07-22 18:44:32 +08:00 committed by Todd Kjos
parent 23e1124fab
commit b0b6463bb2
2 changed files with 10 additions and 0 deletions
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1
include/linux/trace.h
View File

@ -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

9
kernel/trace/trace.c
View File

@ -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)