Author: trasz
Date: Mon Aug 24 14:53:29 2020
New Revision: 364691
URL: https://svnweb.freebsd.org/changeset/base/364691
Log:
MFC r363125 by netchild:
Implement CLOCK_MONOTONIC_RAW (linux >= 2.6.28).
It is documented as a raw hardware-based clock not subject to NTP or
incremental adjustments. With this "not as precise as CLOCK_MONOTONIC"
description in mind, map it to our CLOCK_MONOTNIC_FAST (the same
mapping as for the linux CLOCK_MONOTONIC_COARSE).
This is needed for the webcomponent of steam (chromium) and some
other steam component or game.
The linux-steam-utils port contains a LD_PRELOAD based fix for this.
There this is mapped to CLOCK_MONOTONIC.
As an untrained ear/eye (= the majority of people) is normaly not
noticing a difference of jitter in the 10-20 ms range, specially
if you don't pay attention like for example in a browser session
while watching a video stream, the mapping to CLOCK_MONOTONIC_FAST
seems more appropriate than to CLOCK_MONOTONIC.
MFC r363130 by netchild:
Fix r363125 (Implement CLOCK_MONOTONIC_RAW (linux >= 2.6.28)),
by realy using the MONOTONIC version and not the REALTIME version.
Modified:
stable/12/sys/compat/linux/linux_time.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/compat/linux/linux_time.c
==============================================================================
--- stable/12/sys/compat/linux/linux_time.c Mon Aug 24 14:50:52 2020
(r364690)
+++ stable/12/sys/compat/linux/linux_time.c Mon Aug 24 14:53:29 2020
(r364691)
@@ -215,12 +215,12 @@ linux_to_native_clockid(clockid_t *n, clockid_t l)
*n = CLOCK_REALTIME_FAST;
break;
case LINUX_CLOCK_MONOTONIC_COARSE:
+ case LINUX_CLOCK_MONOTONIC_RAW:
*n = CLOCK_MONOTONIC_FAST;
break;
case LINUX_CLOCK_BOOTTIME:
*n = CLOCK_UPTIME;
break;
- case LINUX_CLOCK_MONOTONIC_RAW:
case LINUX_CLOCK_REALTIME_ALARM:
case LINUX_CLOCK_BOOTTIME_ALARM:
case LINUX_CLOCK_SGI_CYCLE:
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