On 2015/4/24 21:49, David Ahern wrote: > On 4/24/15 7:31 AM, Yunlong Song wrote: >> [Profiling Problem] >> >> Although perf can record the events (with call stack) of a specified pid, >> e.g. using >> "perf record -g iozone -s 262144 -r 64 -i 0 -i 2". But we find iozone is >> interrupted > > That command tells perf to *only* collect data for iozone. This command: > > perf record -g -a -- iozone .... > > tells perf to collect samples system wide as long as the iozone process is > alive. > > >
But we only want the records of iozone rather than the overall system, since other process will interfere the targeted I/O stack of the specific 1% case, and we cannot figure out the "clean" specific stack which takes up 60% time. -- Thanks, Yunlong Song -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
