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https://github.com/git/git.git
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ee4512ed48
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>
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
#ifndef TR2_TLS_H
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#define TR2_TLS_H
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#include "strbuf.h"
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/*
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* Arbitry limit for thread names for column alignment.
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*/
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#define TR2_MAX_THREAD_NAME (24)
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struct tr2tls_thread_ctx {
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struct strbuf thread_name;
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uint64_t *array_us_start;
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int alloc;
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int nr_open_regions; /* plays role of "nr" in ALLOC_GROW */
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int thread_id;
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};
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/*
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* Create TLS data for the current thread. This gives us a place to
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* put per-thread data, such as thread start time, function nesting
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* and a per-thread label for our messages.
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*
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* We assume the first thread is "main". Other threads are given
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* non-zero thread-ids to help distinguish messages from concurrent
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* threads.
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*
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* Truncate the thread name if necessary to help with column alignment
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* in printf-style messages.
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*
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* In this and all following functions the term "self" refers to the
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* current thread.
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*/
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struct tr2tls_thread_ctx *tr2tls_create_self(const char *thread_name);
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/*
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* Get our TLS data.
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*/
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struct tr2tls_thread_ctx *tr2tls_get_self(void);
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/*
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* return true if the current thread is the main thread.
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*/
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int tr2tls_is_main_thread(void);
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/*
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* Free our TLS data.
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*/
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void tr2tls_unset_self(void);
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/*
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* Begin a new nested region and remember the start time.
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*/
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void tr2tls_push_self(uint64_t us_now);
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/*
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* End the innermost nested region.
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*/
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void tr2tls_pop_self(void);
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/*
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* Pop any extra (above the first) open regions on the current
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* thread and discard. During a thread-exit, we should only
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* have region[0] that was pushed in trace2_thread_start() if
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* the thread exits normally.
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*/
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void tr2tls_pop_unwind_self(void);
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/*
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* Compute the elapsed time since the innermost region in the
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* current thread started and the given time (usually now).
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*/
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uint64_t tr2tls_region_elasped_self(uint64_t us);
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/*
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* Compute the elapsed time since the main thread started
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* and the given time (usually now). This is assumed to
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* be the absolute run time of the process.
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*/
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uint64_t tr2tls_absolute_elapsed(uint64_t us);
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/*
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* Initialize the tr2 TLS system.
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*/
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void tr2tls_init(void);
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/*
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* Free all tr2 TLS resources.
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*/
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void tr2tls_release(void);
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/*
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* Protected increment of an integer.
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*/
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int tr2tls_locked_increment(int *p);
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#endif /* TR2_TLS_H */
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