Messages in this thread |  | | Date | Sun, 05 Jan 2003 12:38:16 -0800 | From | Andrew Morton <> | Subject | Re: 2.5.54-mm3 |
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uaca@alumni.uv.es wrote: > > On Sat, Jan 04, 2003 at 01:00:38AM -0800, Andrew Morton wrote: > > > > http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.54/2.5.54-mm3/ > > It seems to me that the patch you pointed here doesn't include the latency > instrumentation.
No, it doesn't. You can monitor the latency using realfeel or realfeel2 from http://www.zip.com.au/~akpm/linux/amlat.tar.gz
But that won't tell you _why_ large latencies are occurring. For that, you'll need to apply http://www.zip.com.au/~akpm/linux/patches/2.5/2.5.54/2.5.54-mm3/experimental/rtc-debug.patch and run `amlat'. This combination will spit out stack backtraces whenever there is a 2 millisecond scheduling overrun.
> Where it is the needed instrumentation to meassure it? > > In http://www.zip.com.au/~akpm/linux/ the are no timepeg/intlat patches for > 2.5...
That's not suitable for this work. intlat is OK for locating and measuring interrupts-off code paths. But it's a bit hard to drive. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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