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| author | Markus Metzger <markus.t.metzger@intel.com> | 2013-06-03 15:39:35 +0200 |
|---|---|---|
| committer | Markus Metzger <markus.t.metzger@intel.com> | 2014-01-16 13:11:42 +0100 |
| commit | 969c39fbcd6a5675c1f4b97cd23d680e4b5b6487 (patch) | |
| tree | 54d7a2c546ecf86fbe37536db86d0916734203d8 /gdb/doc | |
| parent | 0b722aec57e2e54083c1d56657762945ad4604fc (diff) | |
| download | gdb-969c39fbcd6a5675c1f4b97cd23d680e4b5b6487.zip gdb-969c39fbcd6a5675c1f4b97cd23d680e4b5b6487.tar.gz gdb-969c39fbcd6a5675c1f4b97cd23d680e4b5b6487.tar.bz2 | |
btrace, gdbserver: read branch trace incrementally
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.
Diffstat (limited to 'gdb/doc')
| -rw-r--r-- | gdb/doc/gdb.texinfo | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo index d0f2f71..57071d1 100644 --- a/gdb/doc/gdb.texinfo +++ b/gdb/doc/gdb.texinfo @@ -39978,6 +39978,14 @@ Returns all available branch trace. @item new Returns all available branch trace if the branch trace changed since the last read request. + +@item delta +Returns the new branch trace since the last read request. Adds a new +block to the end of the trace that begins at zero and ends at the source +location of the first branch in the trace buffer. This extra block is +used to stitch traces together. + +If the trace buffer overflowed, returns an error indicating the overflow. @end table This packet is not probed by default; the remote stub must request it |