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| author | Peter Zijlstra <peterz@infradead.org> | 2020-07-16 13:11:24 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-07-20 11:50:47 +0100 |
| commit | 1b86abc1c645ad5c9c7bf70910cb3ce73939d2d7 (patch) | |
| tree | 8f72d9b938e23f26de7f0be72a0e11efc77c8b1c /kernel/sysctl.c | |
| parent | 539707caa1a89ee4efc57b4e4231c20c46575ccc (diff) | |
| download | lwn-1b86abc1c645ad5c9c7bf70910cb3ce73939d2d7.tar.gz lwn-1b86abc1c645ad5c9c7bf70910cb3ce73939d2d7.zip | |
sched_clock: Expose struct clock_read_data
In order to support perf_event_mmap_page::cap_time features, an
architecture needs, aside from a userspace readable counter register,
to expose the exact clock data so that userspace can convert the
counter register into a correct timestamp.
Provide struct clock_read_data and two (seqcount) helpers so that
architectures (arm64 in specific) can expose the numbers to userspace.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Link: https://lore.kernel.org/r/20200716051130.4359-2-leo.yan@linaro.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'kernel/sysctl.c')
0 files changed, 0 insertions, 0 deletions