Re: [PATCH v5 9/9] powerpc/mm: Enable move pmd/pud

[PATCH v5 0/9] Speedup mremap on ppc64 · Aneesh Kumar K.V <hidden> · 2021-04-22
[PATCH v5 1/9] selftest/mremap_test: Update the test to handle pagesize other than 4K · Aneesh Kumar K.V <hidden> · 2021-04-22
[PATCH v5 2/9] selftest/mremap_test: Avoid crash with static build · Aneesh Kumar K.V <hidden> · 2021-04-22
[PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-04-22
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Nathan Chancellor <nathan@kernel.org> · 2021-05-18
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-05-19
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Nathan Chancellor <nathan@kernel.org> · 2021-05-19
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Peter Xu <peterx@redhat.com> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Peter Xu <peterx@redhat.com> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Aneesh Kumar K.V <hidden> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Peter Xu <peterx@redhat.com> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Zi Yan <ziy@nvidia.com> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Peter Xu <peterx@redhat.com> · 2021-05-20
Re: [PATCH v5 3/9] mm/mremap: Use pmd/pud_poplulate to update page table entries · Kalesh Singh <hidden> · 2021-05-20
[PATCH v5 4/9] powerpc/mm/book3s64: Fix possible build error · Aneesh Kumar K.V <hidden> · 2021-04-22
[PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Aneesh Kumar K.V <hidden> · 2021-04-22
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-15
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Andrew Morton <akpm@linux-foundation.org> · 2021-05-15
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-15
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Aneesh Kumar K.V <hidden> · 2021-05-17
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-17
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Aneesh Kumar K.V <hidden> · 2021-05-17
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-17
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Michael Ellerman <mpe@ellerman.id.au> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Segher Boessenkool <hidden> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Segher Boessenkool <hidden> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Segher Boessenkool <hidden> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Michael Ellerman <mpe@ellerman.id.au> · 2021-05-20
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Segher Boessenkool <hidden> · 2021-05-20
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-19
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Michael Ellerman <mpe@ellerman.id.au> · 2021-05-20
Re: [PATCH v5 5/9] powerpc/mm/book3s64: Update tlb flush routines to take a page walk cache flush argument · Guenter Roeck <linux@roeck-us.net> · 2021-05-20
[PATCH v5 6/9] mm/mremap: Use range flush that does TLB and page walk cache flush · Aneesh Kumar K.V <hidden> · 2021-04-22
[PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-04-22
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-20
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-20
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Linus Torvalds <torvalds@linux-foundation.org> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Linus Torvalds <torvalds@linux-foundation.org> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Linus Torvalds <torvalds@linux-foundation.org> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-24
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Liam Howlett <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Aneesh Kumar K.V <hidden> · 2021-05-21
Re: [PATCH v5 7/9] mm/mremap: Move TLB flush outside page table lock · Linus Torvalds <torvalds@linux-foundation.org> · 2021-05-21
[PATCH v5 8/9] mm/mremap: Allow arch runtime override · Aneesh Kumar K.V <hidden> · 2021-04-22
[PATCH v5 9/9] powerpc/mm: Enable move pmd/pud · Aneesh Kumar K.V <hidden> · 2021-04-22
Re: [PATCH v5 9/9] powerpc/mm: Enable move pmd/pud · Andrew Morton <akpm@linux-foundation.org> · 2021-05-11

From: Andrew Morton <akpm@linux-foundation.org>
Date: 2021-05-11 22:19:54
Also in: linux-mm

On Thu, 22 Apr 2021 11:13:23 +0530 "Aneesh Kumar K.V" [off-list ref] 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?

`h`	back out one level
`j`	next message in thread
`k`	previous message in thread
`l`	drill in
`Esc`	close help / fold thread tree
`?`	toggle this help