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etnaviv: drm: use COARSE clock for timeouts when possible

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COARSE clocks add a worst-case jitter of 10ms to the timing, as they
degrade the timing to Linux jiffy accuracy. However, they allow to skip
a syscall on platforms where the accurate version of the clock can not
be accelerated through the VDSO.

Switch to using the COARSE version of the clock when the timeout is
larger than 200ms, i.e. the accuracy of the timeout is degraded less
than 5% by the added worst-case jitter.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27079>
This commit is contained in:
Lucas Stach 2024-01-15 17:12:11 +01:00 • committed by Marge Bot
parent ea754657eb
commit 241e1861da
1 changed files with 1 additions and 1 deletions
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2
src/etnaviv/drm/etnaviv_priv.h
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@ -211,7 +211,7 @@ extern int etna_mesa_debug;
static inline void get_abs_timeout(struct drm_etnaviv_timespec *tv, uint64_t ns)
{
struct timespec t;
clock_gettime(CLOCK_MONOTONIC, &t);
clock_gettime(ns > 200000000 ? CLOCK_MONOTONIC_COARSE : CLOCK_MONOTONIC, &t);
tv->tv_sec = t.tv_sec + ns / NSEC_PER_SEC;
tv->tv_nsec = t.tv_nsec + ns % NSEC_PER_SEC;
if (tv->tv_nsec >= NSEC_PER_SEC) {