[PATCH v5 9/9] powerpc/mm: Enable move pmd/pud
akpm at linux-foundation.org
Wed May 12 08:19:49 AEST 2021
On Thu, 22 Apr 2021 11:13:23 +0530 "Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> 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?
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