Finally this third patch set spins the first RFC I put out to help reduce memory pressure [0]. It updates the commit log with some stats obtained on a guest, but I need to do more tests on more systems and then also with stress-ng. I posted a patch to run stress-ng for modules, so it stresses running finit_module() [1]. Using that instead of kmod test 0008 should be useful as that really puts some heavy load without going through the kernel module auto-loader, that has a restriction of just allowing 50 threads concurrently. The issue with that stress test so far is that unloading doesn't seem to unload yet. The last patch is purely for testing purposes and its value can only be shown if it really does help the use case of a large system with many CPUs. That situation is known currently to cuase issues with subsystems which end up loading tons of the same drivers and so this tries to be a bit defensive for subsystems that might need some love in this area. I have two trees for this patchset, the first one had the ELF checker and validity tests at the end [2], and the latest one re-adjusts the ordering to put this patch set as the last series [3], in line with the order in which I've submitted the patches. I had only run time tested the patch order on [2] but it makes sense to put more of the heavier functional changes at the very end, and request for further testing. [0] https://lkml.kernel.org/r/20230311051712.4095040-1-mcgrof@xxxxxxxxxx [1] https://lore.kernel.org/all/ZBUA6E3kYh0Xuu/c@xxxxxxxxxxxxxxxxxxxxxx/?q=stress-ng+mcgrof [2] https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/log/?h=20230319-module-alloc-opts Luis Chamberlain (5): module: move finished_loading() module: extract patient module check into helper module: avoid allocation if module is already present and ready module: use list_add_tail_rcu() when adding module module: add a sanity check prior to allowing kernel module auto-loading kernel/module/internal.h | 1 + kernel/module/kmod.c | 7 ++ kernel/module/main.c | 139 ++++++++++++++++++++++++--------------- 3 files changed, 93 insertions(+), 54 deletions(-) -- 2.39.1
