John Ogness <john.ogness@xxxxxxxxxxxxx> wrote: > Hi Prarit, > > On 2019-12-05, Prarit Bhargava <prarit@xxxxxxxxxx> wrote: > > Based on the comments there is going to be a v6 but in any case I am > > starting testing of this patchset on several large core systems across > > multiple architectures (x86_64, ARM64, s390, ppc64le). Some of those > > systems are known to fail boot due to the large amount of printk output so > > it will be good to see if these changes resolve those issues. > > Right now the patches only include the ringbuffer as a separate entity > with a test module. So they do not yet have any effect on printk. > > If you apply the patches and then build the "modules" target, you will > have a new test_prb.ko module. Loading that module will start some heavy > testing of the ringbuffer. As long as the testing is successful, the > module will keep testing. During this time the machine will be very > slow, but should still respond. > > The test can be stopped by unloading the module. If the test stops on > its own, then a problem was found. The output of the test is put into > the ftrace buffer. > > It would be nice if you could run the test module on some fat machines, > at least for a few minutes to see if anything explodes. ARM64 and > ppc64le will probably be the most interesting, due to memory barrier > testing. > I've run the module overnight on all 4 arches I mentioned above. I didn't see any failures but IIUC the module test runs at max. I'm going to put a load test on these systems that introduces a variable load to interfere with the prbtest module to see if that kicks anything. > Otherwise I will definitely be reaching out to you when we are ready to > perform actual printk testing with the newly agreed up semantics > (lockless, per-console printing threads, synchronous panic > consoles). Thanks for your help with this. > np :) but I should be the one thanking you ;) P. > John Ogness _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
