perf: Expose get/put_callchain_entry() (d141b8bc) · Commits · 戴 / test

include/linux/perf_event.h

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1244,6 +1244,8 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
	extern struct perf_callchain_entry perf_callchain(struct perf_event event, struct pt_regs *regs);		extern struct perf_callchain_entry perf_callchain(struct perf_event event, struct pt_regs *regs);
	extern int get_callchain_buffers(int max_stack);		extern int get_callchain_buffers(int max_stack);
	extern void put_callchain_buffers(void);		extern void put_callchain_buffers(void);
			extern struct perf_callchain_entry get_callchain_entry(int rctx);
			extern void put_callchain_entry(int rctx);

	extern int sysctl_perf_event_max_stack;		extern int sysctl_perf_event_max_stack;
	extern int sysctl_perf_event_max_contexts_per_stack;		extern int sysctl_perf_event_max_contexts_per_stack;

+6 −7

Original line number	Original line	Diff line number	Diff line
	@@ -149,7 +149,7 @@ void put_callchain_buffers(void)
	}		}
	}		}

	static struct perf_callchain_entry get_callchain_entry(int rctx)		struct perf_callchain_entry get_callchain_entry(int rctx)
	{		{
	int cpu;		int cpu;
	struct callchain_cpus_entries *entries;		struct callchain_cpus_entries *entries;
	@@ -159,8 +159,10 @@ static struct perf_callchain_entry get_callchain_entry(int rctx)
	return NULL;		return NULL;

	entries = rcu_dereference(callchain_cpus_entries);		entries = rcu_dereference(callchain_cpus_entries);
	if (!entries)		if (!entries) {
			put_recursion_context(this_cpu_ptr(callchain_recursion), *rctx);
	return NULL;		return NULL;
			}

	cpu = smp_processor_id();		cpu = smp_processor_id();

	@@ -168,7 +170,7 @@ static struct perf_callchain_entry get_callchain_entry(int rctx)
	(rctx perf_callchain_entry__sizeof()));		(rctx perf_callchain_entry__sizeof()));
	}		}

	static void		void
	put_callchain_entry(int rctx)		put_callchain_entry(int rctx)
	{		{
	put_recursion_context(this_cpu_ptr(callchain_recursion), rctx);		put_recursion_context(this_cpu_ptr(callchain_recursion), rctx);
	@@ -183,11 +185,8 @@ get_perf_callchain(struct pt_regs *regs, u32 init_nr, bool kernel, bool user,
	int rctx;		int rctx;

	entry = get_callchain_entry(&rctx);		entry = get_callchain_entry(&rctx);
	if (rctx == -1)
	return NULL;

	if (!entry)		if (!entry)
	goto exit_put;		return NULL;

	ctx.entry = entry;		ctx.entry = entry;
	ctx.max_stack = max_stack;		ctx.max_stack = max_stack;