Messages in this thread | | | From | Song Liu <> | Subject | Re: [PATCH v4] watchdog: Allow nmi watchdog to use "ref-cycles" event | Date | Fri, 2 Jun 2023 22:11:51 +0000 |
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Hi Andrew and Peter,
Friendly ping... Any comment on this one?
Thanks, Song
> On May 25, 2023, at 3:20 PM, Song Liu <songliubraving@meta.com> wrote: > > Hi Andrew and Peter, > > >> On May 19, 2023, at 9:59 AM, Song Liu <songliubraving@meta.com> wrote: >> >> Hi Andrew and Peter, >> >> Does this version look good do you? >> >> Thanks, >> Song >> >>> On May 17, 2023, at 5:25 PM, Song Liu <song@kernel.org> wrote: >>> >>> NMI watchdog permanently consumes one hardware counters per CPU on the >>> system. For systems that use many hardware counters, this causes more >>> aggressive time multiplexing of perf events. >>> >>> OTOH, some CPUs (mostly Intel) support "ref-cycles" event, which is rarely >>> used. Add kernel cmdline arg nmi_watchdog=ref-cycles to configure the >>> watchdog to use "ref-cycles" event instead of "cycles". >>> >>> Cc: Andrew Morton <akpm@linux-foundation.org> >>> Cc: Peter Zijlstra <peterz@infradead.org> >>> Signed-off-by: Song Liu <song@kernel.org> > > Could you please share your comments on this patch? > > Thanks, > Song
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