Messages in this thread | | | Date | Wed, 10 Jul 2019 21:15:49 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: sched_clock and device suspend/resume |
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On Wed, 10 Jul 2019, Steven Rostedt wrote: > > [ Removed the two emails that were bouncing ] > > On Wed, 10 Jul 2019 21:06:57 +0200 (CEST) > Thomas Gleixner <tglx@linutronix.de> wrote: > > > > > > sched_clock_continuous() ? (I know, horrible name), that simply keeps > > > > > track of the time delta at suspend and returns: > > > > > > > > > > sched_clock() + delta; > > > > > > > > Which you get already when you do > > > > > > > > # echo boot > /sys/kernel/debug/tracing/trace_clock > > > > > > > > > > So basically the answer here is to change printk to use > > > ktime_get_boot_fast_ns() instead of local_clock()? > > > > Aargh. That was tracing. > > > > There was a patchset floating around which actually implemented that clock > > choice for sched_clock as well. Don't know why that was never merged. > > Will it cause issues with the scheduler though. If it doesn't stop > during suspend, can't that make the scheduler think that processes were > using the CPU during the entire suspend and screw up the accounting?
Duh. My brain is not working.
Not sched_clock, the patches were for printk so you could select a printk clock. Can't find them right now.
Thanks,
tglx
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