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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

9
gdb/target.c
View file

@ -4232,18 +4232,19 @@ target_teardown_btrace (struct btrace_target_info *btinfo)
/* See target.h. */
VEC (btrace_block_s) *
target_read_btrace (struct btrace_target_info *btinfo,
enum btrace_error
target_read_btrace (VEC (btrace_block_s) **btrace,
struct btrace_target_info *btinfo,
enum btrace_read_type type)
{
struct target_ops *t;
for (t = current_target.beneath; t != NULL; t = t->beneath)
if (t->to_read_btrace != NULL)
return t->to_read_btrace (btinfo, type);
return t->to_read_btrace (btrace, btinfo, type);
tcomplain ();
return NULL;
return BTRACE_ERR_NOT_SUPPORTED;
}
/* See target.h. */