Existing simpletrace backend allows to trace at max 6 args and does not support strings. This newer tracelog format gets rid of fixed size records and therefore allows to trace variable number of args including strings.
Sample trace: v9fs_version 0.000 tag=0xffff id=0x64 msize=0x2000 version=9P2000.L v9fs_version_return 6.705 tag=0xffff id=0x64 msize=0x2000 version=9P2000.L v9fs_attach 174.467 tag=0x1 id=0x68 fid=0x0 afid=0xffffffffffffffff uname=nobody aname= v9fs_attach_return 4720.454 tag=0x1 id=0x68 type=0xffffffffffffff80 version=0x4f2a4dd0 path=0x220ea6 v9: - Renamed TraceRecordHeader to TraceLogHeader as appropriate - Some more code cleanups v8: - Addressed Stefan's comment on v7 series. - Included fix suggested by Stefan to use raw malloc/free in writer thread. v7: - Introduced clear_buffer_range to reset buffer range after consuming record. - Introduced cap on string length using MAX_TRACE_STRLEN (currently set to 512) to avoid calculating wrong length when string length is > sizeof(uint32_t). - Reverted idx refresh back to inside while-loop in writeout_thread. v6: - Corrected flush condition and reverted un-necessary check in get_trace_record - moved idx refresh out of while-loop in writeout_thread, see comments in code. v5: - Addressed Stefan's review comments on v4 series. - Inroduced code to handle corrupted records due to racing tracers. v4: - removed unused safe_strlen interface (missed in v3). v3: - Addressed Stefan's review comments on v2 series v2: - moved elimination of st_print_trace to 1/3 patch - use sizeof(TraceRecord) for #define ST_REC_HDR_LEN v1: - Simpletrace v2 for the new (pythonized) tracetool Harsh Prateek Bora (3): monitor: remove unused do_info_trace Simpletrace v2: Support multiple arguments, strings. Update simpletrace.py for new log format monitor.c | 16 --- scripts/simpletrace.py | 116 +++++++++------ scripts/tracetool/backend/simple.py | 90 +++++++++--- trace/simple.c | 268 ++++++++++++++++++++--------------- trace/simple.h | 39 +++-- 5 files changed, 333 insertions(+), 196 deletions(-) -- 1.7.10.4
