Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async()

[PATCH 00/12] mm: free retracted page table by RCU · Hugh Dickins <hughd@google.com> · 2023-05-29
[PATCH 01/12] mm/pgtable: add rcu_read_lock() and rcu_read_unlock()s · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 01/12] mm/pgtable: add rcu_read_lock() and rcu_read_unlock()s · Jann Horn <jannh@google.com> · 2023-05-31
Re: [PATCH 01/12] mm/pgtable: add rcu_read_lock() and rcu_read_unlock()s · Hugh Dickins <hughd@google.com> · 2023-06-02
Re: [PATCH 01/12] mm/pgtable: add rcu_read_lock() and rcu_read_unlock()s · Jann Horn <jannh@google.com> · 2023-06-02
[PATCH 02/12] mm/pgtable: add PAE safety to __pte_offset_map() · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 02/12] mm/pgtable: add PAE safety to __pte_offset_map() · Matthew Wilcox <willy@infradead.org> · 2023-05-29
[PATCH 03/12] arm: adjust_pte() use pte_offset_map_nolock() · Hugh Dickins <hughd@google.com> · 2023-05-29
[PATCH 04/12] powerpc: assert_pte_locked() use pte_offset_map_nolock() · Hugh Dickins <hughd@google.com> · 2023-05-29
[PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Matthew Wilcox <willy@infradead.org> · 2023-05-29
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Gerald Schaefer <gerald.schaefer@linux.ibm.com> · 2023-06-01
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-06-02
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Jason Gunthorpe <jgg@ziepe.ca> · 2023-06-02
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-06-06
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Jason Gunthorpe <jgg@ziepe.ca> · 2023-06-06
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Peter Xu <peterx@redhat.com> · 2023-06-06
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Jason Gunthorpe <jgg@ziepe.ca> · 2023-06-06
Re: [PATCH 05/12] powerpc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-06-07
[PATCH 06/12] sparc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 06/12] sparc: add pte_free_defer() for pgtables sharing page · Hugh Dickins <hughd@google.com> · 2023-06-06
[PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Hugh Dickins <hughd@google.com> · 2023-06-06
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Jason Gunthorpe <jgg@ziepe.ca> · 2023-06-06
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Hugh Dickins <hughd@google.com> · 2023-06-08
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Gerald Schaefer <gerald.schaefer@linux.ibm.com> · 2023-06-06
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Hugh Dickins <hughd@google.com> · 2023-06-08
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Jason Gunthorpe <jgg@ziepe.ca> · 2023-06-08
Re: [PATCH 07/12] s390: add pte_free_defer(), with use of mmdrop_async() · Gerald Schaefer <gerald.schaefer@linux.ibm.com> · 2023-06-08
[PATCH 08/12] mm/pgtable: add pte_free_defer() for pgtable as page · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 08/12] mm/pgtable: add pte_free_defer() for pgtable as page · Jann Horn <jannh@google.com> · 2023-06-01
[PATCH 09/12] mm/khugepaged: retract_page_tables() without mmap or vma lock · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 09/12] mm/khugepaged: retract_page_tables() without mmap or vma lock · Peter Xu <peterx@redhat.com> · 2023-05-29
Re: [PATCH 09/12] mm/khugepaged: retract_page_tables() without mmap or vma lock · Hugh Dickins <hughd@google.com> · 2023-05-31
Re: [PATCH 09/12] mm/khugepaged: retract_page_tables() without mmap or vma lock · Jann Horn <jannh@google.com> · 2023-05-31
Re: [PATCH 09/12] mm/khugepaged: retract_page_tables() without mmap or vma lock · Hugh Dickins <hughd@google.com> · 2023-06-06
[PATCH 10/12] mm/khugepaged: collapse_pte_mapped_thp() with mmap_read_lock() · Hugh Dickins <hughd@google.com> · 2023-05-29
Re: [PATCH 10/12] mm/khugepaged: collapse_pte_mapped_thp() with mmap_read_lock() · Jann Horn <jannh@google.com> · 2023-05-31
Re: [PATCH 10/12] mm/khugepaged: collapse_pte_mapped_thp() with mmap_read_lock() · Hugh Dickins <hughd@google.com> · 2023-06-02
[PATCH 11/12] mm/khugepaged: delete khugepaged_collapse_pte_mapped_thps() · Hugh Dickins <hughd@google.com> · 2023-05-29
[PATCH 12/12] mm: delete mmap_write_trylock() and vma_try_start_write() · Hugh Dickins <hughd@google.com> · 2023-05-29

From: Jason Gunthorpe <jgg@ziepe.ca>
Date: 2023-06-06 18:40:10
Also in: linux-arm-kernel, linux-s390, lkml, sparclinux

On Mon, Jun 05, 2023 at 10:11:52PM -0700, Hugh Dickins wrote:

"deposited" pagetable fragments, over in arch/s390/mm/pgtable.c: use
the first two longs of the page table itself for threading the list.

It is not RCU anymore if it writes to the page table itself before the
grace period, so this change seems to break the RCU behavior of
page_table_free_rcu().. The rcu sync is inside tlb_remove_table()
called after the stores.

Maybe something like an xarray on the mm to hold the frags?

Jason

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