From 70ed91c6ec7f8bf20369634017d887d48ac979d2 Mon Sep 17 00:00:00 2001 From: "zhangwei(Jovi)" Date: Fri, 17 Jan 2014 17:08:38 +0900 Subject: tracing/uprobes: Support ftrace_event_file base multibuffer Support multi-buffer on uprobe-based dynamic events by using ftrace_event_file. This patch is based kprobe-based dynamic events multibuffer support work initially, commited by Masami(commit 41a7dd420c), but revised as below: Oleg changed the kprobe-based multibuffer design from array-pointers of ftrace_event_file into simple list, so this patch also change to the list design. rcu_read_lock/unlock added into uprobe_trace_func/uretprobe_trace_func, to synchronize with ftrace_event_file list add and delete. Even though we allow multi-uprobes instances now, but TP_FLAG_PROFILE/TP_FLAG_TRACE are still mutually exclusive in probe_event_enable currently, this means we cannot allow one user is using uprobe-tracer, and another user is using perf-probe on same uprobe concurrently. (Perhaps this will be fix in future, kprobe don't have this limitation now) Link: http://lkml.kernel.org/r/1389946120-19610-4-git-send-email-namhyung@kernel.org Reviewed-by: Masami Hiramatsu Reviewed-by: Oleg Nesterov Cc: Ingo Molnar Cc: Frederic Weisbecker Cc: Srikar Dronamraju Signed-off-by: zhangwei(Jovi) Signed-off-by: Namhyung Kim Signed-off-by: Steven Rostedt --- kernel/trace/trace_probe.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'kernel/trace/trace_probe.h') diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index b73574a5f429..fb1ab5dfbd42 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -288,6 +288,11 @@ struct trace_probe { struct probe_arg args[]; }; +struct event_file_link { + struct ftrace_event_file *file; + struct list_head list; +}; + static inline bool trace_probe_is_enabled(struct trace_probe *tp) { return !!(tp->flags & (TP_FLAG_TRACE | TP_FLAG_PROFILE)); @@ -316,6 +321,18 @@ static inline int is_good_name(const char *name) return 1; } +static inline struct event_file_link * +find_event_file_link(struct trace_probe *tp, struct ftrace_event_file *file) +{ + struct event_file_link *link; + + list_for_each_entry(link, &tp->files, list) + if (link->file == file) + return link; + + return NULL; +} + extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size, struct probe_arg *parg, bool is_return, bool is_kprobe); -- cgit v1.2.3