> On Oct 11, 2019, at 6:40 PM, Guilherme G. Piccoli <gpiccoli@xxxxxxxxxxxxx> wrote: > > Kdump kernels won't benefit from hugepages - in fact it's quite opposite, > it may be the case hugepages on kdump kernel can lead to OOM if kernel > gets unable to allocate demanded pages due to the fact the preallocated > hugepages are consuming a lot of memory. > > This patch proposes a new kernel parameter to prevent the creation of > HugeTLB hugepages - we currently don't have a way to do that. We can > even have kdump scripts removing the kernel command-line options to > set hugepages, but it's not straightforward to prevent sysctl/sysfs > configuration, given it happens in later boot or anytime when the > system is running. Typically, kdump kernel has its own initramfs, and don’t even need to mount a rootfs, so I can’t see how sysfs/sysctl is relevant here.
