Date: Sun, 12 Jul 2020 09:51:10 +0000 (UTC) From: Alexander Leidinger <netchild@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r363125 - head/sys/compat/linux Message-ID: <202007120951.06C9pA4F024281@repo.freebsd.org>
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Author: netchild Date: Sun Jul 12 09:51:09 2020 New Revision: 363125 URL: https://svnweb.freebsd.org/changeset/base/363125 Log: 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. Modified: head/sys/compat/linux/linux_time.c Modified: head/sys/compat/linux/linux_time.c ============================================================================== --- head/sys/compat/linux/linux_time.c Sun Jul 12 09:49:53 2020 (r363124) +++ head/sys/compat/linux/linux_time.c Sun Jul 12 09:51:09 2020 (r363125) @@ -212,6 +212,7 @@ linux_to_native_clockid(clockid_t *n, clockid_t l) *n = CLOCK_THREAD_CPUTIME_ID; break; case LINUX_CLOCK_REALTIME_COARSE: + case LINUX_CLOCK_MONOTONIC_RAW: *n = CLOCK_REALTIME_FAST; break; case LINUX_CLOCK_MONOTONIC_COARSE: @@ -220,7 +221,6 @@ linux_to_native_clockid(clockid_t *n, clockid_t l) 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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