Removed CLOCK_MONOTONIC_COARSE support.
While clock_gettime(CLOCK_MONOTONIC_COARSE) is faster than
clock_gettime(CLOCK_MONOTONIC), the latter is fast enough on Linux for
practical usage, and the difference is negligible compared to other costs
at each event loop iteration. On the other hand, CLOCK_MONOTONIC_COARSE
causes various issues with typical CONFIG_HZ=250, notably very inaccurate
limit_rate handling in some edge cases (ticket #1678) and negative difference
between $request_time and $upstream_response_time (ticket #1965).
diff --git a/src/core/ngx_times.c b/src/core/ngx_times.c
index 7964b00..16788c9 100644
--- a/src/core/ngx_times.c
+++ b/src/core/ngx_times.c
@@ -200,10 +200,6 @@
#if defined(CLOCK_MONOTONIC_FAST)
clock_gettime(CLOCK_MONOTONIC_FAST, &ts);
-
-#elif defined(CLOCK_MONOTONIC_COARSE)
- clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
-
#else
clock_gettime(CLOCK_MONOTONIC, &ts);
#endif
