diff options
| -rw-r--r-- | src/core/lib/iomgr/exec_ctx.cc | 81 | ||||
| -rw-r--r-- | src/core/lib/iomgr/exec_ctx.h | 2 | ||||
| -rw-r--r-- | src/core/lib/iomgr/timer_manager.cc | 4 |
3 files changed, 10 insertions, 77 deletions
diff --git a/src/core/lib/iomgr/exec_ctx.cc b/src/core/lib/iomgr/exec_ctx.cc index 27c769a7ed..257ada0f65 100644 --- a/src/core/lib/iomgr/exec_ctx.cc +++ b/src/core/lib/iomgr/exec_ctx.cc @@ -25,9 +25,6 @@ #include "src/core/lib/iomgr/combiner.h" #include "src/core/lib/profiling/timers.h" -#define GRPC_START_TIME_UPDATE_INTERVAL 10000 -extern "C" grpc_tracer_flag grpc_timer_check_trace; - bool grpc_exec_ctx_ready_to_finish(grpc_exec_ctx* exec_ctx) { if ((exec_ctx->flags & GRPC_EXEC_CTX_FLAG_IS_FINISHED) == 0) { if (exec_ctx->check_ready_to_finish(exec_ctx, @@ -107,49 +104,16 @@ static void exec_ctx_sched(grpc_exec_ctx* exec_ctx, grpc_closure* closure, grpc_closure_list_append(&exec_ctx->closure_list, closure, error); } -/* This time pair is not entirely thread-safe as store/load of tv_sec and - * tv_nsec are performed separately. However g_start_time do not need to have - * sub-second precision, so it is ok if the value of tv_nsec is off in this - * case. */ -typedef struct time_atm_pair { - gpr_atm tv_sec; - gpr_atm tv_nsec; -} time_atm_pair; - -static time_atm_pair - g_start_time[GPR_TIMESPAN + 1]; // assumes GPR_TIMESPAN is the - // last enum value in - // gpr_clock_type -static grpc_millis g_last_start_time_update; - -static gpr_timespec timespec_from_time_atm_pair(const time_atm_pair* src, - gpr_clock_type clock_type) { - gpr_timespec time; - time.tv_nsec = (int32_t)gpr_atm_no_barrier_load(&src->tv_nsec); - time.tv_sec = (int64_t)gpr_atm_no_barrier_load(&src->tv_sec); - time.clock_type = clock_type; - return time; -} - -static void time_atm_pair_store(time_atm_pair* dst, const gpr_timespec src) { - gpr_atm_no_barrier_store(&dst->tv_sec, src.tv_sec); - gpr_atm_no_barrier_store(&dst->tv_nsec, src.tv_nsec); -} +static gpr_timespec g_start_time; void grpc_exec_ctx_global_init(void) { - for (int i = 0; i < GPR_TIMESPAN; i++) { - time_atm_pair_store(&g_start_time[i], gpr_now((gpr_clock_type)i)); - } - // allows uniform treatment in conversion functions - time_atm_pair_store(&g_start_time[GPR_TIMESPAN], gpr_time_0(GPR_TIMESPAN)); + g_start_time = gpr_now(GPR_CLOCK_MONOTONIC); } void grpc_exec_ctx_global_shutdown(void) {} static gpr_atm timespec_to_atm_round_down(gpr_timespec ts) { - gpr_timespec start_time = - timespec_from_time_atm_pair(&g_start_time[ts.clock_type], ts.clock_type); - ts = gpr_time_sub(ts, start_time); + ts = gpr_time_sub(ts, g_start_time); double x = GPR_MS_PER_SEC * (double)ts.tv_sec + (double)ts.tv_nsec / GPR_NS_PER_MS; if (x < 0) return 0; @@ -158,9 +122,7 @@ static gpr_atm timespec_to_atm_round_down(gpr_timespec ts) { } static gpr_atm timespec_to_atm_round_up(gpr_timespec ts) { - gpr_timespec start_time = - timespec_from_time_atm_pair(&g_start_time[ts.clock_type], ts.clock_type); - ts = gpr_time_sub(ts, start_time); + ts = gpr_time_sub(ts, g_start_time); double x = GPR_MS_PER_SEC * (double)ts.tv_sec + (double)ts.tv_nsec / GPR_NS_PER_MS + (double)(GPR_NS_PER_SEC - 1) / (double)GPR_NS_PER_SEC; @@ -195,41 +157,18 @@ gpr_timespec grpc_millis_to_timespec(grpc_millis millis, if (clock_type == GPR_TIMESPAN) { return gpr_time_from_millis(millis, GPR_TIMESPAN); } - gpr_timespec start_time = - timespec_from_time_atm_pair(&g_start_time[clock_type], clock_type); - return gpr_time_add(start_time, gpr_time_from_millis(millis, GPR_TIMESPAN)); + return gpr_time_add(gpr_convert_clock_type(g_start_time, clock_type), + gpr_time_from_millis(millis, GPR_TIMESPAN)); } grpc_millis grpc_timespec_to_millis_round_down(gpr_timespec ts) { - return timespec_to_atm_round_down(ts); + return timespec_to_atm_round_down( + gpr_convert_clock_type(ts, g_start_time.clock_type)); } grpc_millis grpc_timespec_to_millis_round_up(gpr_timespec ts) { - return timespec_to_atm_round_up(ts); -} - -void grpc_exec_ctx_maybe_update_start_time(grpc_exec_ctx* exec_ctx) { - grpc_millis now = grpc_exec_ctx_now(exec_ctx); - grpc_millis last_start_time_update = - gpr_atm_no_barrier_load(&g_last_start_time_update); - - if (now > last_start_time_update && - now - last_start_time_update > GRPC_START_TIME_UPDATE_INTERVAL) { - /* Get the current system time and subtract \a now from it, where \a now is - * the relative time from grpc_init() from monotonic clock. This calibrates - * the time when grpc_exec_ctx_global_init was called based on current - * system clock. */ - gpr_atm_no_barrier_store(&g_last_start_time_update, now); - gpr_timespec real_now = gpr_now(GPR_CLOCK_REALTIME); - gpr_timespec real_start_time = - gpr_time_sub(real_now, gpr_time_from_millis(now, GPR_TIMESPAN)); - time_atm_pair_store(&g_start_time[GPR_CLOCK_REALTIME], real_start_time); - - if (GRPC_TRACER_ON(grpc_timer_check_trace)) { - gpr_log(GPR_DEBUG, "Update realtime clock start time: %" PRId64 "s %dns", - real_start_time.tv_sec, real_start_time.tv_nsec); - } - } + return timespec_to_atm_round_up( + gpr_convert_clock_type(ts, g_start_time.clock_type)); } static const grpc_closure_scheduler_vtable exec_ctx_scheduler_vtable = { diff --git a/src/core/lib/iomgr/exec_ctx.h b/src/core/lib/iomgr/exec_ctx.h index 6035e08361..bd27506152 100644 --- a/src/core/lib/iomgr/exec_ctx.h +++ b/src/core/lib/iomgr/exec_ctx.h @@ -124,8 +124,6 @@ gpr_timespec grpc_millis_to_timespec(grpc_millis millis, gpr_clock_type clock); grpc_millis grpc_timespec_to_millis_round_down(gpr_timespec timespec); grpc_millis grpc_timespec_to_millis_round_up(gpr_timespec timespec); -void grpc_exec_ctx_maybe_update_start_time(grpc_exec_ctx* exec_ctx); - #ifdef __cplusplus } #endif diff --git a/src/core/lib/iomgr/timer_manager.cc b/src/core/lib/iomgr/timer_manager.cc index acc40b6c9e..163c9b5211 100644 --- a/src/core/lib/iomgr/timer_manager.cc +++ b/src/core/lib/iomgr/timer_manager.cc @@ -226,10 +226,6 @@ static void timer_main_loop(grpc_exec_ctx* exec_ctx) { grpc_millis next = GRPC_MILLIS_INF_FUTURE; grpc_exec_ctx_invalidate_now(exec_ctx); - /* Calibrate g_start_time in exec_ctx.cc with a regular interval in case the - * system clock has changed */ - grpc_exec_ctx_maybe_update_start_time(exec_ctx); - // check timer state, updates next to the next time to run a check switch (grpc_timer_check(exec_ctx, &next)) { case GRPC_TIMERS_FIRED: |