On Tue, 19 May 2020 23:45:10 +0200 Thomas Gleixner <[email protected]> wrote:
> >> @@ -165,20 +155,22 @@ void trace_hwlat_callback(bool enter) > >> * Used to repeatedly capture the CPU TSC (or similar), looking for > >> potential > >> * hardware-induced latency. Called with interrupts disabled and with > >> * hwlat_data.lock held. > >> + * > >> + * Use ktime_get_mono_fast() here as well because it does not wait on the > >> + * timekeeping seqcount like ktime_get_mono(). > > > > When doing a "git grep ktime_get_mono" I only find > > ktime_get_mono_fast_ns() (and this comment), so I don't know what to compare > > that to. Did you mean another function? > > Yeah. I fatfingered the comment. The code uses ktime_get_mono_fast_ns(). Well, I assumed that's what you meant with "ktime_get_mono_fast()" but I don't know what function you are comparing it to that waits on the seqcount like "ktime_get_mono()" as there is no such function. -- Steve
