Yonghong Song e87c6bc385 bpf: permit multiple bpf attachments for a single perf event ... This patch enables multiple bpf attachments for a kprobe/uprobe/tracepoint single trace event. Each trace_event keeps a list of attached perf events. When an event happens, all attached bpf programs will be executed based on the order of attachment. A global bpf_event_mutex lock is introduced to protect prog_array attaching and detaching. An alternative will be introduce a mutex lock in every trace_event_call structure, but it takes a lot of extra memory. So a global bpf_event_mutex lock is a good compromise. The bpf prog detachment involves allocation of memory. If the allocation fails, a dummy do-nothing program will replace to-be-detached program in-place. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-10-25 10:47:47 +09:00
..
events	tcp: add tracepoint trace_tcp_set_state()	2017-10-24 01:21:25 +01:00
define_trace.h	tracing: Introduce TRACE_EVENT_FN_COND macro	2015-12-23 14:27:21 -05:00
perf.h	bpf: permit multiple bpf attachments for a single perf event	2017-10-25 10:47:47 +09:00
syscall.h
trace_events.h	tracing: define TRACE_DEFINE_SIZEOF() macro to map sizeof's to their values	2017-06-13 17:10:57 -04:00