Re: [PATCH 0/3] Optimize mremap() by PTE-batching

[Dev Jain <dev.jain@arm.com>]

On 06/05/25 2:46 pm, Anshuman Khandual wrote:
> On 5/6/25 10:30, Dev Jain wrote:
>> Use PTE batching to optimize mremap().
>>
>> Mapping 512K of memory, memsetting it, remapping it to src + 512K, and
>> munmapping it 10,000 times, the average execution time reduces from 1.9 to
>> 1.2 seconds, giving a 37% performance optimization. (Apple M3)
> 
> That's impressive improvement. But could you please re-organize the test
> description into a pseudo code format or better provide the test program
> itself (which should be compact anyways) just to be more clear about the
> scenario where this helps.

Sure.

> 
>>
>> Dev Jain (3):
>>    mm: Call pointers to ptes as ptep
>>    mm: Add generic helper to hint a large folio
>>    mm: Optimize mremap() by PTE batching
>>
>>   include/linux/pgtable.h | 16 +++++++++++++++
>>   mm/mremap.c             | 44 +++++++++++++++++++++++++++--------------
>>   2 files changed, 45 insertions(+), 15 deletions(-)
>>