On Wed, Mar 15, 2023 at 01:24:41PM +0100, David Hildenbrand wrote: > On 11.03.23 06:17, Luis Chamberlain wrote: > > A long time ago we had some issues with userspace doing stupid stuff. > > Well, it turns out even the kernel and do stupid stuff too, as we're > > learning with the ACPI modules aliaes and that hammering tons of loads. > > > > So add a bit of code which gets us a bit more in the defensive about > > these situations. > > > > To experiment, this also adds in-kernel alias support to see if this helps > > with some larger systems. > > > > This is all based on some old code which tried to add defensive > > mechanisms the last of which was here and I had dropped the ball: > > > > https://lore.kernel.org/all/20171208001540.23696-1-mcgrof@xxxxxxxxxx/ > > > > I've only compile tested this for now. Will need to stress to test > > with kmod tests 0008 and 0009 to see if there's any differences. > > I'll have to re-test and re-gnuplot stuff there. But early feedback > > is appreciated, hence the RFC. > > > > David Hildenbrand had reported a while ago issues with userspace > > doing insane things with allocations bringing a system down to > > its knees. This is part of the motivation for this series. > > > I'll try to grab a system where I can reproduce the issue and give your > patches a churn. Great, then please wait for v2 RFC as the first patch was missing an obvious mutex grab / release, I already have some memory pressure data that shows gains. Hope to post soon. Luis
