> > sched_clock() will still be strictly monotonic. During switch over we
> > will guarantee to continue from where the early clock left.
>
> Not quite. There is at least one broken integration that results in
> large, spurious jumps ahead. If one of these jumps happens during the
> "unstable" phas
On 04/01/2019 16:23, Pavel Tatashin wrote:
Hi Pavel,
>>> We could limit arm64 approach only for chips where cntvct_el0 is
>>> working: i.e. frequency is known, and the clock is stable, meaning
>>> cannot go backward. Perhaps we would start early clock a little later,
>>> but at least it will be a
Hi Marc,
Thank you for taking a look at this please see my replies below.
> > I think, given that on other platforms sched_clock() is already used
> > early, it is not a good idea to invent a different clock just for time
> > stamps.
>
> Square pegs vs round holes. Mimicking other architectures i
On Thu, 03 Jan 2019 19:58:25 +,
Pavel Tatashin wrote:
>
> > I still think this approach is flawed. You provide the kernel with a
> > potentially broken sched_clock that may jump back and forth until the
> > workaround kicks in. Nobody expects this.
> >
> > Instead, I'd suggest you allow for a
> I still think this approach is flawed. You provide the kernel with a
> potentially broken sched_clock that may jump back and forth until the
> workaround kicks in. Nobody expects this.
>
> Instead, I'd suggest you allow for a something other than local_clock()
> to be used for the time stamping u
Hi Pavel,
On 26/12/2018 16:45, Pavel Tatashin wrote:
> Allow printk time stamps/sched_clock() to be available from the early
> boot.
>
> Signed-off-by: Pavel Tatashin
> ---
> arch/arm64/kernel/setup.c | 25 +
> 1 file changed, 25 insertions(+)
>
> diff --git a/arch/arm6
Allow printk time stamps/sched_clock() to be available from the early
boot.
Signed-off-by: Pavel Tatashin
---
arch/arm64/kernel/setup.c | 25 +
1 file changed, 25 insertions(+)
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 4b0e1231625c..28126fa
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