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vdso: support more flags for clock_gettime() vdso interface

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Current vdso(implemented by sentry, and used by the real application)
is a partial implimentation. More specifically, the clock_gettime()
vdso interface only works for CLOCK_REALTIME, CLOCK_BOOTTIME, and
CLOCK_MONOTONIC.

So we support more flags for clock_gettime() vdso interface here, like
CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_RAW, and CLOCK_MONOTONIC_COARSE,
to accelerate clock_gettime() call of real application.

And their implementations refer to the internal syscall of gvisor.
See function getClock() in pkg/sentry/syscalls/linux/sys_time.go.

Signed-off-by: Chen Hui <cedriccchen@tencent.com>
This commit is contained in:
Chen Hui
2022-09-14 15:04:50 +08:00
parent 175282956a
commit 4318924054
1 changed files with 6 additions and 0 deletions
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vdso/vdso.cc
+6
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@@ -29,12 +29,18 @@ int __common_clock_gettime(clockid_t clock, struct timespec* ts) {
int ret;
switch (clock) {
case CLOCK_REALTIME_COARSE:
// Fallthrough, CLOCK_REALTIME_COARSE is an alias for CLOCK_REALTIME
case CLOCK_REALTIME:
ret = ClockRealtime(ts);
break;
case CLOCK_BOOTTIME:
// Fallthrough, CLOCK_BOOTTIME is an alias for CLOCK_MONOTONIC
case CLOCK_MONOTONIC_RAW:
// Fallthrough, CLOCK_MONOTONIC_RAW is an alias for CLOCK_MONOTONIC
case CLOCK_MONOTONIC_COARSE:
// Fallthrough, CLOCK_MONOTONIC_COARSE is an alias for CLOCK_MONOTONIC
case CLOCK_MONOTONIC:
ret = ClockMonotonic(ts);
break;