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c46c406ae1
Performance measurements are listed right now as a flat list, which is fine when we measure big blocks. But when we start adding more and more measurements, some of them could be just part of a bigger measurement and a flat list gives a wrong impression that they are executed at the same level instead of nested. Add trace_performance_enter() and trace_performance_leave() to allow indent these nested measurements. For now it does not help much because the only nested thing is (lazy) name hash initialization (e.g. called in diff-index from "git status"). This will help more because I'm going to add some more tracing that's actually nested. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
155 lines
4.9 KiB
C
155 lines
4.9 KiB
C
#ifndef TRACE_H
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#define TRACE_H
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#include "git-compat-util.h"
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#include "strbuf.h"
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struct trace_key {
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const char * const key;
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int fd;
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unsigned int initialized : 1;
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unsigned int need_close : 1;
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};
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extern struct trace_key trace_default_key;
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#define TRACE_KEY_INIT(name) { "GIT_TRACE_" #name, 0, 0, 0 }
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extern struct trace_key trace_perf_key;
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extern struct trace_key trace_setup_key;
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extern void trace_repo_setup(const char *prefix);
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extern int trace_want(struct trace_key *key);
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extern void trace_disable(struct trace_key *key);
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extern uint64_t getnanotime(void);
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extern void trace_command_performance(const char **argv);
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extern void trace_verbatim(struct trace_key *key, const void *buf, unsigned len);
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uint64_t trace_performance_enter(void);
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#ifndef HAVE_VARIADIC_MACROS
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__attribute__((format (printf, 1, 2)))
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extern void trace_printf(const char *format, ...);
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__attribute__((format (printf, 2, 3)))
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extern void trace_printf_key(struct trace_key *key, const char *format, ...);
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__attribute__((format (printf, 2, 3)))
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extern void trace_argv_printf(const char **argv, const char *format, ...);
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extern void trace_strbuf(struct trace_key *key, const struct strbuf *data);
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/* Prints elapsed time (in nanoseconds) if GIT_TRACE_PERFORMANCE is enabled. */
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__attribute__((format (printf, 2, 3)))
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extern void trace_performance(uint64_t nanos, const char *format, ...);
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/* Prints elapsed time since 'start' if GIT_TRACE_PERFORMANCE is enabled. */
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__attribute__((format (printf, 2, 3)))
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extern void trace_performance_since(uint64_t start, const char *format, ...);
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__attribute__((format (printf, 1, 2)))
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void trace_performance_leave(const char *format, ...);
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#else
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/*
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* Macros to add file:line - see above for C-style declarations of how these
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* should be used.
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*/
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/*
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* TRACE_CONTEXT may be set to __FUNCTION__ if the compiler supports it. The
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* default is __FILE__, as it is consistent with assert(), and static function
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* names are not necessarily unique.
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*
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* __FILE__ ":" __FUNCTION__ doesn't work with GNUC, as __FILE__ is supplied
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* by the preprocessor as a string literal, and __FUNCTION__ is filled in by
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* the compiler as a string constant.
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*/
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#ifndef TRACE_CONTEXT
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# define TRACE_CONTEXT __FILE__
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#endif
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/*
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* Note: with C99 variadic macros, __VA_ARGS__ must include the last fixed
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* parameter ('format' in this case). Otherwise, a call without variable
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* arguments will have a surplus ','. E.g.:
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*
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* #define foo(format, ...) bar(format, __VA_ARGS__)
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* foo("test");
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*
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* will expand to
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*
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* bar("test",);
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*
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* which is invalid (note the ',)'). With GNUC, '##__VA_ARGS__' drops the
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* comma, but this is non-standard.
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*/
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#define trace_printf_key(key, ...) \
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do { \
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if (trace_pass_fl(key)) \
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trace_printf_key_fl(TRACE_CONTEXT, __LINE__, key, \
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__VA_ARGS__); \
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} while (0)
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#define trace_printf(...) trace_printf_key(&trace_default_key, __VA_ARGS__)
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#define trace_argv_printf(argv, ...) \
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do { \
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if (trace_pass_fl(&trace_default_key)) \
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trace_argv_printf_fl(TRACE_CONTEXT, __LINE__, \
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argv, __VA_ARGS__); \
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} while (0)
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#define trace_strbuf(key, data) \
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do { \
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if (trace_pass_fl(key)) \
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trace_strbuf_fl(TRACE_CONTEXT, __LINE__, key, data);\
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} while (0)
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#define trace_performance(nanos, ...) \
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do { \
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if (trace_pass_fl(&trace_perf_key)) \
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trace_performance_fl(TRACE_CONTEXT, __LINE__, nanos,\
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__VA_ARGS__); \
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} while (0)
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#define trace_performance_since(start, ...) \
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do { \
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if (trace_pass_fl(&trace_perf_key)) \
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trace_performance_fl(TRACE_CONTEXT, __LINE__, \
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getnanotime() - (start), \
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__VA_ARGS__); \
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} while (0)
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#define trace_performance_leave(...) \
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do { \
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if (trace_pass_fl(&trace_perf_key)) \
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trace_performance_leave_fl(TRACE_CONTEXT, __LINE__, \
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getnanotime(), \
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__VA_ARGS__); \
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} while (0)
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/* backend functions, use non-*fl macros instead */
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__attribute__((format (printf, 4, 5)))
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extern void trace_printf_key_fl(const char *file, int line, struct trace_key *key,
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const char *format, ...);
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__attribute__((format (printf, 4, 5)))
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extern void trace_argv_printf_fl(const char *file, int line, const char **argv,
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const char *format, ...);
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extern void trace_strbuf_fl(const char *file, int line, struct trace_key *key,
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const struct strbuf *data);
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__attribute__((format (printf, 4, 5)))
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extern void trace_performance_fl(const char *file, int line,
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uint64_t nanos, const char *fmt, ...);
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__attribute__((format (printf, 4, 5)))
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extern void trace_performance_leave_fl(const char *file, int line,
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uint64_t nanos, const char *fmt, ...);
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static inline int trace_pass_fl(struct trace_key *key)
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{
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return key->fd || !key->initialized;
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}
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#endif /* HAVE_VARIADIC_MACROS */
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#endif /* TRACE_H */
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