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btrace, gdbserver: read branch trace incrementally

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Read branch trace data incrementally and extend the current trace rather than
discarding it and reading the entire trace buffer each time.

If the branch trace buffer overflowed, we can't extend the current trace so we
discard it and start anew by reading the entire branch trace buffer.

2014-01-16  Markus Metzger  <markus.t.metzger@intel.com>

	* common/linux-btrace.c (perf_event_read_bts, linux_read_btrace):
	Support delta reads.
	(linux_disable_btrace): Change return type.
	* common/linux-btrace.h (linux_read_btrace): Change parameters
	and return type to allow error reporting.  Update users.
	(linux_disable_btrace): Change return type.  Update users.
	* common/btrace-common.h (btrace_read_type) <BTRACE_READ_DELTA>:
	New.
	(btrace_error): New.
	(btrace_block) <begin>: Comment on BEGIN == 0.
	* btrace.c (btrace_compute_ftrace): Start from the end of
	the current trace.
	(btrace_stitch_trace, btrace_clear_history): New.
	(btrace_fetch): Read delta trace, return if replaying.
	(btrace_clear): Move clear history code to btrace_clear_history.
	(parse_xml_btrace): Throw an error if parsing failed.
	* target.h (struct target_ops) <to_read_btrace>: Change parameters
	and return type to allow error reporting.
	(target_read_btrace): Change parameters and return type to allow
	error reporting.
	* target.c (target_read_btrace): Update.
	* remote.c (remote_read_btrace): Support delta reads.  Pass
	errors on.
	* NEWS: Announce it.

gdbserver/
	* target.h (target_ops) <read_btrace>: Change parameters and
	return type to allow error reporting.
	* server.c (handle_qxfer_btrace): Support delta reads.  Pass
	trace reading errors on.
	* linux-low.c (linux_low_read_btrace): Pass trace reading
	errors on.
	(linux_low_disable_btrace): New.
This commit is contained in:
Markus Metzger
2013-06-03 15:39:35 +02:00
parent 0b722aec57
commit 969c39fbcd
16 changed files with 369 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
gdb/target.h
View File

@ -839,9 +839,13 @@ struct target_ops
be attempting to talk to a remote target. */
void (*to_teardown_btrace) (struct btrace_target_info *tinfo);
/* Read branch trace data. */
VEC (btrace_block_s) *(*to_read_btrace) (struct btrace_target_info *,
enum btrace_read_type);
/* Read branch trace data for the thread indicated by BTINFO into DATA.
DATA is cleared before new trace is added.
The branch trace will start with the most recent block and continue
towards older blocks. */
enum btrace_error (*to_read_btrace) (VEC (btrace_block_s) **data,
struct btrace_target_info *btinfo,
enum btrace_read_type type);
/* Stop trace recording. */
void (*to_stop_recording) (void);
@ -1998,8 +2002,9 @@ extern void target_disable_btrace (struct btrace_target_info *btinfo);
extern void target_teardown_btrace (struct btrace_target_info *btinfo);
/* See to_read_btrace in struct target_ops. */
extern VEC (btrace_block_s) *target_read_btrace (struct btrace_target_info *,
enum btrace_read_type);
extern enum btrace_error target_read_btrace (VEC (btrace_block_s) **,
struct btrace_target_info *,
enum btrace_read_type);
/* See to_stop_recording in struct target_ops. */
extern void target_stop_recording (void);