diff options
| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-02 22:43:10 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-11-11 04:39:40 +0300 |
| commit | 28575c61ea602537a3d86fe301a53554e59452ae (patch) | |
| tree | f7214b99b1dbe7c46f2b859b07452dc3f336f85c /kernel/trace/ring_buffer.c | |
| parent | 7b68621f8d16689cbb4203aceaca86ffb165f1d0 (diff) | |
| download | linux-28575c61ea602537a3d86fe301a53554e59452ae.tar.xz | |
ring-buffer: Add recording of ring buffer recursion into recursed_functions
Add a new config RING_BUFFER_RECORD_RECURSION that will place functions that
recurse from the ring buffer into the ftrace recused_functions file.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index dc83b3fa9fe7..ab68f28b8f4b 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -4,6 +4,7 @@ * * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com> */ +#include <linux/trace_recursion.h> #include <linux/trace_events.h> #include <linux/ring_buffer.h> #include <linux/trace_clock.h> @@ -3006,6 +3007,13 @@ rb_wakeups(struct trace_buffer *buffer, struct ring_buffer_per_cpu *cpu_buffer) irq_work_queue(&cpu_buffer->irq_work.work); } +#ifdef CONFIG_RING_BUFFER_RECORD_RECURSION +# define do_ring_buffer_record_recursion() \ + do_ftrace_record_recursion(_THIS_IP_, _RET_IP_) +#else +# define do_ring_buffer_record_recursion() do { } while (0) +#endif + /* * The lock and unlock are done within a preempt disable section. * The current_context per_cpu variable can only be modified @@ -3088,8 +3096,10 @@ trace_recursive_lock(struct ring_buffer_per_cpu *cpu_buffer) * been updated yet. In this case, use the TRANSITION bit. */ bit = RB_CTX_TRANSITION; - if (val & (1 << (bit + cpu_buffer->nest))) + if (val & (1 << (bit + cpu_buffer->nest))) { + do_ring_buffer_record_recursion(); return 1; + } } val |= (1 << (bit + cpu_buffer->nest)); |