linux-toradex.git/include/trace/perf.h, branch v4.11-rc3

tracing: Use outer () on __get_str() definition

2016-07-15T19:50:58+00:00

__get_str(str)'s definition includes a (char *) operator
overloading that is not protected with outer ().

This patch adds () around __get_str()'s definition, enabling
some code cleanup.

Link: http://lkml.kernel.org/r/20ac1a10c2ec4ccd23e4a8ef34101fb6e4157d37.1467407618.git.bristot@redhat.com

Cc: Trond Myklebust 
Cc: Anna Schumaker 
Cc: Ingo Molnar 
Suggested-by: Steven Rostedt 
Reviewed-by: Steven Rostedt 
Signed-off-by: Daniel Bristot de Oliveira 
Signed-off-by: Steven Rostedt

perf, bpf: minimize the size of perf_trace_() tracepoint handler

2016-04-21T17:48:20+00:00

move trace_call_bpf() into helper function to minimize the size
of perf_trace_*() tracepoint handlers.
    text	   data	    bss	    dec	 	   hex	filename
10541679	5526646	2945024	19013349	1221ee5	vmlinux_before
10509422	5526646	2945024	18981092	121a0e4	vmlinux_after

It may seem that perf_fetch_caller_regs() can also be moved,
but that is incorrect, since ip/sp will be wrong.

bpf+tracepoint performance is not affected, since
perf_swevent_put_recursion_context() is now inlined.
export_symbol_gpl can also be dropped.

No measurable change in normal perf tracepoints.

Suggested-by: Steven Rostedt 
Signed-off-by: Alexei Starovoitov 
Acked-by: Peter Zijlstra (Intel) 
Acked-by: Steven Rostedt 
Signed-off-by: David S. Miller

perf, bpf: allow bpf programs attach to tracepoints

2016-04-08T01:04:26+00:00

introduce BPF_PROG_TYPE_TRACEPOINT program type and allow it to be attached
to the perf tracepoint handler, which will copy the arguments into
the per-cpu buffer and pass it to the bpf program as its first argument.
The layout of the fields can be discovered by doing
'cat /sys/kernel/debug/tracing/events/sched/sched_switch/format'
prior to the compilation of the program with exception that first 8 bytes
are reserved and not accessible to the program. This area is used to store
the pointer to 'struct pt_regs' which some of the bpf helpers will use:
+---------+
| 8 bytes | hidden 'struct pt_regs *' (inaccessible to bpf program)
+---------+
| N bytes | static tracepoint fields defined in tracepoint/format (bpf readonly)
+---------+
| dynamic | __dynamic_array bytes of tracepoint (inaccessible to bpf yet)
+---------+

Not that all of the fields are already dumped to user space via perf ring buffer
and broken application access it directly without consulting tracepoint/format.
Same rule applies here: static tracepoint fields should only be accessed
in a format defined in tracepoint/format. The order of fields and
field sizes are not an ABI.

Signed-off-by: Alexei Starovoitov 
Acked-by: Peter Zijlstra (Intel) 
Signed-off-by: David S. Miller

perf: split perf_trace_buf_prepare into alloc and update parts

2016-04-08T01:04:26+00:00

split allows to move expensive update of 'struct trace_entry' to later phase.
Repurpose unused 1st argument of perf_tp_event() to indicate event type.

While splitting use temp variable 'rctx' instead of '*rctx' to avoid
unnecessary loads done by the compiler due to -fno-strict-aliasing

Signed-off-by: Alexei Starovoitov 
Acked-by: Peter Zijlstra (Intel) 
Signed-off-by: David S. Miller

perf: remove unused __addr variable

2016-04-08T01:04:26+00:00

now all calls to perf_trace_buf_submit() pass 0 as 4th
argument which will be repurposed in the next patch which will
change the meaning of 1st arg of perf_tp_event() to event_type

Signed-off-by: Alexei Starovoitov 
Acked-by: Peter Zijlstra (Intel) 
Signed-off-by: David S. Miller

tracing: Move non perf code out of perf.h

2015-09-23T13:31:34+00:00

Commit ee53bbd17257 "tracing: Move the perf code out of trace_event.h" moved
more than just the perf code out of trace_event.h, but also removed a bit of
the tracing code too. Move it back.

Signed-off-by: Steven Rostedt

tracing: Rename ftrace_get_offsets_##call() to trace_event_get_offsets_##call()

2015-05-14T01:49:01+00:00

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The function ftrace_get_offsets_##call()
is used to find the offset into dynamically allocated trace event fields
for printing. It has nothing to do with function tracing. Rename it.

Signed-off-by: Steven Rostedt

tracing: Rename ftrace_define_fields_##call() to trace_event_define_fields_##call()

2015-05-14T01:49:00+00:00

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The function ftrace_define_fields_##call()
is used to define how to process the trace_event fields. It has nothing to
do with function tracing. Rename it.

Signed-off-by: Steven Rostedt

tracing: Rename ftrace_event_type_funcs_##call to trace_event_type_funcs_##call

2015-05-14T01:48:59+00:00

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The structure ftrace_event_type_funcs_##call
is used to define how the trace_events will be printed. It has nothing to
do with function tracing. Rename it.

Signed-off-by: Steven Rostedt

tracing: Rename ftrace_data_offset_##call to trace_event_data_offset_##call

2015-05-14T01:48:58+00:00

The name "ftrace" really refers to the function hook infrastructure. It
is not about the trace_events. The structure ftrace_data_offset_##call is
used to find the offsets of dynamically allocated fields in trace_events.
It has nothing to do with function tracing. Rename it.

Signed-off-by: Steven Rostedt