On Thu, 22 Apr 2021 11:13:23 +0530 "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx> wrote: > mremap HAVE_MOVE_PMD/PUD optimization time comparison for 1GB region: > 1GB mremap - Source PTE-aligned, Destination PTE-aligned > mremap time: 1127034ns > 1GB mremap - Source PMD-aligned, Destination PMD-aligned > mremap time: 508817ns > 1GB mremap - Source PUD-aligned, Destination PUD-aligned > mremap time: 23046ns Well that's nice. How significant is this in practice? How common is it for applications to successfully align the region? Do real-world applications actually benefit from this? Are there userspace libraries (malloc() etc) which should be reworked to fully exploit this?
