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Message-ID: <ZqY9gRujwqOGuvW1@kernel.org>
Date: Sun, 28 Jul 2024 15:45:53 +0300
From: Mike Rapoport <rppt@...nel.org>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
linuxppc-dev@...ts.ozlabs.org, xen-devel@...ts.xenproject.org,
linux-fsdevel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Oscar Salvador <osalvador@...e.de>, Peter Xu <peterx@...hat.com>,
Muchun Song <muchun.song@...ux.dev>,
Russell King <linux@...linux.org.uk>,
Michael Ellerman <mpe@...erman.id.au>,
Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Juergen Gross <jgross@...e.com>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
Christian Brauner <brauner@...nel.org>
Subject: Re: [PATCH v1 1/3] mm: turn USE_SPLIT_PTE_PTLOCKS /
USE_SPLIT_PTE_PTLOCKS into Kconfig options
On Fri, Jul 26, 2024 at 05:07:26PM +0200, David Hildenbrand wrote:
> Let's clean that up a bit and prepare for depending on
> CONFIG_SPLIT_PMD_PTLOCKS in other Kconfig options.
>
> More cleanups would be reasonable (like the arch-specific "depends on"
> for CONFIG_SPLIT_PTE_PTLOCKS), but we'll leave that for another day.
>
> Signed-off-by: David Hildenbrand <david@...hat.com>
Acked-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> ---
> arch/arm/mm/fault-armv.c | 6 +++---
> arch/x86/xen/mmu_pv.c | 7 ++++---
> include/linux/mm.h | 8 ++++----
> include/linux/mm_types.h | 2 +-
> include/linux/mm_types_task.h | 3 ---
> kernel/fork.c | 4 ++--
> mm/Kconfig | 18 +++++++++++-------
> mm/memory.c | 2 +-
> 8 files changed, 26 insertions(+), 24 deletions(-)
>
> diff --git a/arch/arm/mm/fault-armv.c b/arch/arm/mm/fault-armv.c
> index 2286c2ea60ec4..831793cd6ff94 100644
> --- a/arch/arm/mm/fault-armv.c
> +++ b/arch/arm/mm/fault-armv.c
> @@ -61,7 +61,7 @@ static int do_adjust_pte(struct vm_area_struct *vma, unsigned long address,
> return ret;
> }
>
> -#if USE_SPLIT_PTE_PTLOCKS
> +#if defined(CONFIG_SPLIT_PTE_PTLOCKS)
> /*
> * If we are using split PTE locks, then we need to take the page
> * lock here. Otherwise we are using shared mm->page_table_lock
> @@ -80,10 +80,10 @@ static inline void do_pte_unlock(spinlock_t *ptl)
> {
> spin_unlock(ptl);
> }
> -#else /* !USE_SPLIT_PTE_PTLOCKS */
> +#else /* !defined(CONFIG_SPLIT_PTE_PTLOCKS) */
> static inline void do_pte_lock(spinlock_t *ptl) {}
> static inline void do_pte_unlock(spinlock_t *ptl) {}
> -#endif /* USE_SPLIT_PTE_PTLOCKS */
> +#endif /* defined(CONFIG_SPLIT_PTE_PTLOCKS) */
>
> static int adjust_pte(struct vm_area_struct *vma, unsigned long address,
> unsigned long pfn)
> diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
> index f1ce39d6d32cb..f4a316894bbb4 100644
> --- a/arch/x86/xen/mmu_pv.c
> +++ b/arch/x86/xen/mmu_pv.c
> @@ -665,7 +665,7 @@ static spinlock_t *xen_pte_lock(struct page *page, struct mm_struct *mm)
> {
> spinlock_t *ptl = NULL;
>
> -#if USE_SPLIT_PTE_PTLOCKS
> +#if defined(CONFIG_SPLIT_PTE_PTLOCKS)
> ptl = ptlock_ptr(page_ptdesc(page));
> spin_lock_nest_lock(ptl, &mm->page_table_lock);
> #endif
> @@ -1553,7 +1553,8 @@ static inline void xen_alloc_ptpage(struct mm_struct *mm, unsigned long pfn,
>
> __set_pfn_prot(pfn, PAGE_KERNEL_RO);
>
> - if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS && !pinned)
> + if (level == PT_PTE && IS_ENABLED(CONFIG_SPLIT_PTE_PTLOCKS) &&
> + !pinned)
> __pin_pagetable_pfn(MMUEXT_PIN_L1_TABLE, pfn);
>
> xen_mc_issue(XEN_LAZY_MMU);
> @@ -1581,7 +1582,7 @@ static inline void xen_release_ptpage(unsigned long pfn, unsigned level)
> if (pinned) {
> xen_mc_batch();
>
> - if (level == PT_PTE && USE_SPLIT_PTE_PTLOCKS)
> + if (level == PT_PTE && IS_ENABLED(CONFIG_SPLIT_PTE_PTLOCKS))
> __pin_pagetable_pfn(MMUEXT_UNPIN_TABLE, pfn);
>
> __set_pfn_prot(pfn, PAGE_KERNEL);
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0472a5090b180..dff43101572ec 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2843,7 +2843,7 @@ static inline void pagetable_free(struct ptdesc *pt)
> __free_pages(page, compound_order(page));
> }
>
> -#if USE_SPLIT_PTE_PTLOCKS
> +#if defined(CONFIG_SPLIT_PTE_PTLOCKS)
> #if ALLOC_SPLIT_PTLOCKS
> void __init ptlock_cache_init(void);
> bool ptlock_alloc(struct ptdesc *ptdesc);
> @@ -2895,7 +2895,7 @@ static inline bool ptlock_init(struct ptdesc *ptdesc)
> return true;
> }
>
> -#else /* !USE_SPLIT_PTE_PTLOCKS */
> +#else /* !defined(CONFIG_SPLIT_PTE_PTLOCKS) */
> /*
> * We use mm->page_table_lock to guard all pagetable pages of the mm.
> */
> @@ -2906,7 +2906,7 @@ static inline spinlock_t *pte_lockptr(struct mm_struct *mm, pte_t *pte)
> static inline void ptlock_cache_init(void) {}
> static inline bool ptlock_init(struct ptdesc *ptdesc) { return true; }
> static inline void ptlock_free(struct ptdesc *ptdesc) {}
> -#endif /* USE_SPLIT_PTE_PTLOCKS */
> +#endif /* defined(CONFIG_SPLIT_PTE_PTLOCKS) */
>
> static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc)
> {
> @@ -2966,7 +2966,7 @@ pte_t *pte_offset_map_nolock(struct mm_struct *mm, pmd_t *pmd,
> ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd))? \
> NULL: pte_offset_kernel(pmd, address))
>
> -#if USE_SPLIT_PMD_PTLOCKS
> +#if defined(CONFIG_SPLIT_PMD_PTLOCKS)
>
> static inline struct page *pmd_pgtable_page(pmd_t *pmd)
> {
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 4854249792545..165c58b12ccc9 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -947,7 +947,7 @@ struct mm_struct {
> #ifdef CONFIG_MMU_NOTIFIER
> struct mmu_notifier_subscriptions *notifier_subscriptions;
> #endif
> -#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
> +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !defined(CONFIG_SPLIT_PMD_PTLOCKS)
> pgtable_t pmd_huge_pte; /* protected by page_table_lock */
> #endif
> #ifdef CONFIG_NUMA_BALANCING
> diff --git a/include/linux/mm_types_task.h b/include/linux/mm_types_task.h
> index a2f6179b672b8..bff5706b76e14 100644
> --- a/include/linux/mm_types_task.h
> +++ b/include/linux/mm_types_task.h
> @@ -16,9 +16,6 @@
> #include <asm/tlbbatch.h>
> #endif
>
> -#define USE_SPLIT_PTE_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
> -#define USE_SPLIT_PMD_PTLOCKS (USE_SPLIT_PTE_PTLOCKS && \
> - IS_ENABLED(CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK))
> #define ALLOC_SPLIT_PTLOCKS (SPINLOCK_SIZE > BITS_PER_LONG/8)
>
> /*
> diff --git a/kernel/fork.c b/kernel/fork.c
> index a8362c26ebcb0..216ce9ba4f4e6 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -832,7 +832,7 @@ static void check_mm(struct mm_struct *mm)
> pr_alert("BUG: non-zero pgtables_bytes on freeing mm: %ld\n",
> mm_pgtables_bytes(mm));
>
> -#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
> +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !defined(CONFIG_SPLIT_PMD_PTLOCKS)
> VM_BUG_ON_MM(mm->pmd_huge_pte, mm);
> #endif
> }
> @@ -1276,7 +1276,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
> RCU_INIT_POINTER(mm->exe_file, NULL);
> mmu_notifier_subscriptions_init(mm);
> init_tlb_flush_pending(mm);
> -#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
> +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !defined(CONFIG_SPLIT_PMD_PTLOCKS)
> mm->pmd_huge_pte = NULL;
> #endif
> mm_init_uprobes_state(mm);
> diff --git a/mm/Kconfig b/mm/Kconfig
> index b72e7d040f789..7b716ac802726 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -585,17 +585,21 @@ config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
> # at the same time (e.g. copy_page_range()).
> # DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC spinlock_t also enlarge struct page.
> #
> -config SPLIT_PTLOCK_CPUS
> - int
> - default "999999" if !MMU
> - default "999999" if ARM && !CPU_CACHE_VIPT
> - default "999999" if PARISC && !PA20
> - default "999999" if SPARC32
> - default "4"
> +config SPLIT_PTE_PTLOCKS
> + def_bool y
> + depends on MMU
> + depends on NR_CPUS >= 4
> + depends on !ARM || CPU_CACHE_VIPT
> + depends on !PARISC || PA20
> + depends on !SPARC32
>
> config ARCH_ENABLE_SPLIT_PMD_PTLOCK
> bool
>
> +config SPLIT_PMD_PTLOCKS
> + def_bool y
> + depends on SPLIT_PTE_PTLOCKS && ARCH_ENABLE_SPLIT_PMD_PTLOCK
> +
> #
> # support for memory balloon
> config MEMORY_BALLOON
> diff --git a/mm/memory.c b/mm/memory.c
> index 833d2cad6eb29..714589582fe15 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -6559,7 +6559,7 @@ long copy_folio_from_user(struct folio *dst_folio,
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
>
> -#if USE_SPLIT_PTE_PTLOCKS && ALLOC_SPLIT_PTLOCKS
> +#if defined(CONFIG_SPLIT_PTE_PTLOCKS) && ALLOC_SPLIT_PTLOCKS
>
> static struct kmem_cache *page_ptl_cachep;
>
> --
> 2.45.2
>
>
--
Sincerely yours,
Mike.
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