Messages in this thread | | | Date | Mon, 21 Mar 2016 22:49:35 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 4/4] nmi_backtrace: generate one-line reports for idle cpus |
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On Wed, Mar 16, 2016 at 01:02:13PM -0400, Chris Metcalf wrote: > When doing an nmi backtrace of many cores, most of which are idle, > the output is a little overwhelming and very uninformative. Suppress > messages for cpus that are idling when they are interrupted and just > emit one line, "NMI backtrace for N skipped: idling at pc 0xNNN".
This is still 100+ lines on a modern system, but better than the many many thousands it would otherwise generate.
> We do this by grouping all the cpuidle code together into a new > .cpuidle.text section, and then checking the address of the > interrupted PC to see if it lies within that section. > > Signed-off-by: Chris Metcalf <cmetcalf@mellanox.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Please Cc Rafael on the next posting.
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