Hi Peter, On Fri, Aug 23, 2019 at 5:29 PM Peter Zijlstra <pet...@infradead.org> wrote: > > > A: Because it messes up the order in which people normally read text. > Q: Why is top-posting such a bad thing? > A: Top-posting. > Q: What is the most annoying thing in e-mail?
Sorry for the top-posting. > > On Fri, Aug 23, 2019 at 04:13:46PM +0530, Ganapatrao Kulkarni wrote: > > > We are seeing regression with our uncore perf driver(Marvell's > > ThunderX2, ARM64 server platform) on 5.3-Rc1. > > After bisecting, it turned out to be this patch causing the issue. > > Funnily enough; the email you replied to didn't contain a patch. Hmm sorry, not sure why the patch is clipped-off, I see it in my inbox. > > > Test case: > > Load module and run perf for more than 4 events( we have 4 counters, > > event multiplexing takes place for more than 4 events), then unload > > module. > > With this sequence of testing, the system hangs(soft lockup) after 2 > > or 3 iterations. Same test runs for hours on 5.2. > > > > while [ 1 ] > > do > > rmmod thunderx2_pmu > > modprobe thunderx2_pmu > > perf stat -a -e \ > > uncore_dmc_0/cnt_cycles/,\ > > uncore_dmc_0/data_transfers/,\ > > uncore_dmc_0/read_txns/,\ > > uncore_dmc_0/config=0xE/,\ > > uncore_dmc_0/write_txns/ sleep 1 > > sleep 2 > > done > > Can you reproduce without the module load+unload? I don't think people > routinely unload modules. The issue wont happen, if module is not unloaded/reloaded. IMHO, this could be potential bug! > > Thanks, Ganapat
