On Tue, May 26, 2020 at 02:58:53PM -0400, Qian Cai wrote: > On Tue, May 26, 2020 at 01:43:49PM -0400, Waiman Long wrote: > > It was found by Qian Cai that lockdep splat sometimes appears with the > > "BUG: MAX_LOCKDEP_ENTRIES too low" message on linux-next. On a 32-vcpu VM > > guest with a v5.7-rc7 based kernel, I looked at how many of the various > > table entries were being used after bootup and after a parallel kernel > > build (make -j32). The tables below show the usage statistics. > > I think this approach could help the situatin on this AMD server. > However, I don't understand why this particular system starts to exceed > the MAX_LOCKDEP_ENTRIES. All other Intel, powerpc, amd64 and s390 > running the same workload have only < 20k at the end, but on this AMD > server,
Correction -- Intel is also quite close to exceed it. direct dependencies: 29836 [max: 32768] arm64: direct dependencies: 25268 [max: 32768]