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2020-03-23trace2: teach Git to log environment variablesLibravatar Josh Steadmon1-0/+9
Via trace2, Git can already log interesting config parameters (see the trace2_cmd_list_config() function). However, this can grant an incomplete picture because many config parameters also allow overrides via environment variables. To allow for more complete logs, we add a new trace2_cmd_list_env_vars() function and supporting implementation, modeled after the pre-existing config param logging implementation. Signed-off-by: Josh Steadmon <steadmon@google.com> Acked-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-05-13Merge branch 'jh/trace2'Libravatar Junio C Hamano1-1/+1
A few embarrassing bugfixes. * jh/trace2: trace2: fix up a missing "leave" entry point trace2: fix incorrect function pointer check
2019-05-13Merge branch 'jh/trace2-sid-fix'Libravatar Junio C Hamano1-2/+19
Polishing of the new trace2 facility continues. The system-level configuration can specify site-wide trace2 settings, which can be overridden with per-user configuration and environment variables. * jh/trace2-sid-fix: trace2: fixup access problem on /etc/gitconfig in read_very_early_config trace2: update docs to describe system/global config settings trace2: make SIDs more unique trace2: clarify UTC datetime formatting trace2: report peak memory usage of the process trace2: use system/global config for default trace2 settings config: add read_very_early_config() trace2: find exec-dir before trace2 initialization trace2: add absolute elapsed time to start event trace2: refactor setting process starting time config: initialize opts structure in repo_read_config()
2019-04-26trace2: fix incorrect function pointer checkLibravatar Josh Steadmon1-1/+1
Fix trace2_data_json_fl() to check for the presence of pfn_data_json_fl in its targets, rather than pfn_data_fl, which is not actually called. Signed-off-by: Josh Steadmon <steadmon@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-16trace2: report peak memory usage of the processLibravatar Jeff Hostetler1-0/+2
Teach Windows version of git to report peak memory usage during exit() processing. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-16trace2: use system/global config for default trace2 settingsLibravatar Jeff Hostetler1-0/+4
Teach git to read the system and global config files for default Trace2 settings. This allows system-wide Trace2 settings to be installed and inherited to make it easier to manage a collection of systems. The original GIT_TR2* environment variables are loaded afterwards and can be used to override the system settings. Only the system and global config files are used. Repo and worktree local config files are ignored. Likewise, the "-c" command line arguments are also ignored. These limits are for performance reasons. (1) For users not using Trace2, there should be minimal overhead to detect that Trace2 is not enabled. In particular, Trace2 should not allocate lots of otherwise unused data strucutres. (2) For accurate performance measurements, Trace2 should be initialized as early in the git process as possible, and before most of the normal git process initialization (which involves discovering the .git directory and reading a hierarchy of config files). Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-16trace2: add absolute elapsed time to start eventLibravatar Jeff Hostetler1-1/+7
Add elapsed process time to "start" event to measure the performance of early process startup. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-04-16trace2: refactor setting process starting timeLibravatar Jeff Hostetler1-1/+6
Create trace2_initialize_clock() and call from main() to capture process start time in isolation and before other sub-systems are ready. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-03-20trace2: NULL is not allowed for va_listLibravatar Torsten Bögershausen1-4/+11
Some compilers don't allow NULL to be passed for a va_list, and e.g. "gcc (Raspbian 6.3.0-18+rpi1+deb9u1) 6.3.0 20170516" errors out like this: trace2/tr2_tgt_event.c:193:18: error: invalid operands to binary && (have ‘int’ and ‘va_list {aka __va_list}’) if (fmt && *fmt && ap) { ^^ I couldn't find any hints that va_list and pointers can be mixed, and no hints that they can't either. Morten Welinder comments: "C99, Section 7.15, simply says that va_list "is an object type suitable for holding information needed by the macros va_start, va_end, and va_copy". So clearly not guaranteed to be mixable with pointers... The portable solution is to use "va_list" everywhere in the callchain. As a consequence, both trace2_region_enter_fl() and trace2_region_leave_fl() now take a variable argument list. Signed-off-by: Torsten Bögershausen <tboegi@web.de> Acked-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-02-22trace2: create new combined trace facilityLibravatar Jeff Hostetler1-0/+761
Create a new unified tracing facility for git. The eventual intent is to replace the current trace_printf* and trace_performance* routines with a unified set of git_trace2* routines. In addition to the usual printf-style API, trace2 provides higer-level event verbs with fixed-fields allowing structured data to be written. This makes post-processing and analysis easier for external tools. Trace2 defines 3 output targets. These are set using the environment variables "GIT_TR2", "GIT_TR2_PERF", and "GIT_TR2_EVENT". These may be set to "1" or to an absolute pathname (just like the current GIT_TRACE). * GIT_TR2 is intended to be a replacement for GIT_TRACE and logs command summary data. * GIT_TR2_PERF is intended as a replacement for GIT_TRACE_PERFORMANCE. It extends the output with columns for the command process, thread, repo, absolute and relative elapsed times. It reports events for child process start/stop, thread start/stop, and per-thread function nesting. * GIT_TR2_EVENT is a new structured format. It writes event data as a series of JSON records. Calls to trace2 functions log to any of the 3 output targets enabled without the need to call different trace_printf* or trace_performance* routines. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>