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Thu, 11 Jul 2024 22:45:05 -0400 (EDT) From: Zi Yan To: David Hildenbrand , "Huang, Ying" , linux-mm@kvack.org Cc: Zi Yan , Andrew Morton , Baolin Wang , linux-kernel@vger.kernel.org Subject: [RFC PATCH 1/3] memory tiering: read last_cpupid correctly in do_huge_pmd_numa_page() Date: Thu, 11 Jul 2024 22:44:53 -0400 Message-ID: <20240712024455.163543-2-zi.yan@sent.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240712024455.163543-1-zi.yan@sent.com> References: <20240712024455.163543-1-zi.yan@sent.com> Reply-To: Zi Yan Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zi Yan last_cpupid is only available when memory tiering is off or the folio is in toptier node. Complete the check to read last_cpupid when it is available. Before the fix, the default last_cpupid will be used even if memory tiering mode is turned off at runtime instead of the actual value. This can prevent task_numa_fault() from getting right numa fault stats, but should not cause any crash. User might see performance changes after the fix. Fixes: 33024536bafd ("memory tiering: hot page selection with hint page fau= lt latency") Signed-off-by: Zi Yan Acked-by: David Hildenbrand Reported-by: ... Reported-by: David Hildenbrand Reviewed-by: "Huang, Ying" Reviewed-by: Baolin Wang --- mm/huge_memory.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index d7c84480f1a4..07d9dde4ca33 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1705,7 +1705,8 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) * For memory tiering mode, cpupid of slow memory page is used * to record page access time. So use default value. */ - if (node_is_toptier(nid)) + if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) || + node_is_toptier(nid)) last_cpupid =3D folio_last_cpupid(folio); target_nid =3D numa_migrate_prep(folio, vmf, haddr, nid, &flags); if (target_nid =3D=3D NUMA_NO_NODE) --=20 2.43.0 From nobody Wed Dec 17 08:56:11 2025 Received: from fhigh3-smtp.messagingengine.com (fhigh3-smtp.messagingengine.com [103.168.172.154]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D80DF945A for ; Fri, 12 Jul 2024 02:45:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=103.168.172.154 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720752311; cv=none; b=aGEL2MzQgV2dMFPsFXfbsJyrQ9p6LFLh0ipYAYJbMT/Sn/hC2N6p6bdrhlkIregD7u8mL7gw6jmw6sDbfTwneKmIiQzTgf4kc2i85gEnWZE2N62ZiNYFT0FHoMI8wxQleyej2ltQeEWFHO74NY3OuBtO6Ym3DN/yy3e/gNnoIy4= ARC-Message-Signature: i=1; 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Thu, 11 Jul 2024 22:45:07 -0400 (EDT) From: Zi Yan To: David Hildenbrand , "Huang, Ying" , linux-mm@kvack.org Cc: Zi Yan , Andrew Morton , Baolin Wang , linux-kernel@vger.kernel.org Subject: [RFC PATCH 2/3] memory tiering: introduce folio_has_cpupid() check Date: Thu, 11 Jul 2024 22:44:54 -0400 Message-ID: <20240712024455.163543-3-zi.yan@sent.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240712024455.163543-1-zi.yan@sent.com> References: <20240712024455.163543-1-zi.yan@sent.com> Reply-To: Zi Yan Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zi Yan Instead of open coded check for if memory tiering mode is on and a folio is in the top tier memory, use a function to encapsulate the check. Signed-off-by: Zi Yan Reviewed-by: "Huang, Ying" --- include/linux/memory-tiers.h | 8 ++++++++ kernel/sched/fair.c | 3 +-- mm/huge_memory.c | 6 ++---- mm/memory-tiers.c | 17 +++++++++++++++++ mm/memory.c | 3 +-- mm/mprotect.c | 3 +-- 6 files changed, 30 insertions(+), 10 deletions(-) diff --git a/include/linux/memory-tiers.h b/include/linux/memory-tiers.h index 0dc0cf2863e2..10c127d461c4 100644 --- a/include/linux/memory-tiers.h +++ b/include/linux/memory-tiers.h @@ -73,6 +73,10 @@ static inline bool node_is_toptier(int node) } #endif =20 + +bool folio_has_cpupid(struct folio *folio); + + #else =20 #define numa_demotion_enabled false @@ -151,5 +155,9 @@ static inline struct memory_dev_type *mt_find_alloc_mem= ory_type(int adist, static inline void mt_put_memory_types(struct list_head *memory_types) { } +static inline bool folio_has_cpupid(struct folio *folio) +{ + return true; +} #endif /* CONFIG_NUMA */ #endif /* _LINUX_MEMORY_TIERS_H */ diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 8a5b1ae0aa55..03de808cb3cc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1840,8 +1840,7 @@ bool should_numa_migrate_memory(struct task_struct *p= , struct folio *folio, * The pages in slow memory node should be migrated according * to hot/cold instead of private/shared. */ - if (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING && - !node_is_toptier(src_nid)) { + if (!folio_has_cpupid(folio)) { struct pglist_data *pgdat; unsigned long rate_limit; unsigned int latency, th, def_th; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 07d9dde4ca33..8c11d6da4b36 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1705,8 +1705,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) * For memory tiering mode, cpupid of slow memory page is used * to record page access time. So use default value. */ - if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) || - node_is_toptier(nid)) + if (folio_has_cpupid(folio)) last_cpupid =3D folio_last_cpupid(folio); target_nid =3D numa_migrate_prep(folio, vmf, haddr, nid, &flags); if (target_nid =3D=3D NUMA_NO_NODE) @@ -2059,8 +2058,7 @@ int change_huge_pmd(struct mmu_gather *tlb, struct vm= _area_struct *vma, toptier) goto unlock; =20 - if (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING && - !toptier) + if (!folio_has_cpupid(folio)) folio_xchg_access_time(folio, jiffies_to_msecs(jiffies)); } diff --git a/mm/memory-tiers.c b/mm/memory-tiers.c index 4775b3a3dabe..7f0360d4e3a0 100644 --- a/mm/memory-tiers.c +++ b/mm/memory-tiers.c @@ -6,6 +6,7 @@ #include #include #include +#include =20 #include "internal.h" =20 @@ -50,6 +51,22 @@ static const struct bus_type memory_tier_subsys =3D { .dev_name =3D "memory_tier", }; =20 +/** + * folio_has_cpupid - check if a folio has cpupid information + * @folio: folio to check + * + * folio's _last_cpupid field is repurposed by memory tiering. In memory + * tiering mode, cpupid of slow memory folio (not toptier memory) is used = to + * record page access time. + * + * Return: the folio _last_cpupid is used as cpupid + */ +bool folio_has_cpupid(struct folio *folio) +{ + return !(sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING) || + node_is_toptier(folio_nid(folio)); +} + #ifdef CONFIG_MIGRATION static int top_tier_adistance; /* diff --git a/mm/memory.c b/mm/memory.c index dceb62f3fa34..96c2f5b3d796 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5344,8 +5344,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) * For memory tiering mode, cpupid of slow memory page is used * to record page access time. 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Thu, 11 Jul 2024 22:45:08 -0400 (EDT) From: Zi Yan To: David Hildenbrand , "Huang, Ying" , linux-mm@kvack.org Cc: Zi Yan , Andrew Morton , Baolin Wang , linux-kernel@vger.kernel.org Subject: [RFC PATCH 3/3] mm/migrate: move common code to numa_migrate_check (was numa_migrate_prep) Date: Thu, 11 Jul 2024 22:44:55 -0400 Message-ID: <20240712024455.163543-4-zi.yan@sent.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240712024455.163543-1-zi.yan@sent.com> References: <20240712024455.163543-1-zi.yan@sent.com> Reply-To: Zi Yan Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Zi Yan do_numa_page() and do_huge_pmd_numa_page() share a lot of common code. To reduce redundancy, move common code to numa_migrate_prep() and rename the function to numa_migrate_check() to reflect its functionality. There is some code difference between do_numa_page() and do_huge_pmd_numa_page() before the code move: 1. do_huge_pmd_numa_page() did not check shared folios to set TNF_SHARED. 2. do_huge_pmd_numa_page() did not check and skip zone device folios. Signed-off-by: Zi Yan --- mm/huge_memory.c | 28 ++++++----------- mm/internal.h | 5 +-- mm/memory.c | 81 +++++++++++++++++++++++------------------------- 3 files changed, 52 insertions(+), 62 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8c11d6da4b36..66d67d13e0dc 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1670,10 +1670,10 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *v= mf) pmd_t pmd; struct folio *folio; unsigned long haddr =3D vmf->address & HPAGE_PMD_MASK; - int nid =3D NUMA_NO_NODE; - int target_nid, last_cpupid =3D (-1 & LAST_CPUPID_MASK); + int target_nid =3D NUMA_NO_NODE; + int last_cpupid =3D (-1 & LAST_CPUPID_MASK); bool writable =3D false; - int flags =3D 0; + int flags =3D 0, nr_pages; =20 vmf->ptl =3D pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { @@ -1693,21 +1693,13 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *v= mf) writable =3D true; =20 folio =3D vm_normal_folio_pmd(vma, haddr, pmd); - if (!folio) + if (!folio || folio_is_zone_device(folio)) goto out_map; =20 - /* See similar comment in do_numa_page for explanation */ - if (!writable) - flags |=3D TNF_NO_GROUP; + nr_pages =3D folio_nr_pages(folio); =20 - nid =3D folio_nid(folio); - /* - * For memory tiering mode, cpupid of slow memory page is used - * to record page access time. So use default value. - */ - if (folio_has_cpupid(folio)) - last_cpupid =3D folio_last_cpupid(folio); - target_nid =3D numa_migrate_prep(folio, vmf, haddr, nid, &flags); + target_nid =3D numa_migrate_check(folio, vmf, haddr, writable, + &flags, &last_cpupid); if (target_nid =3D=3D NUMA_NO_NODE) goto out_map; if (migrate_misplaced_folio_prepare(folio, vma, target_nid)) { @@ -1720,8 +1712,8 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) =20 if (!migrate_misplaced_folio(folio, vma, target_nid)) { flags |=3D TNF_MIGRATED; - nid =3D target_nid; } else { + target_nid =3D NUMA_NO_NODE; flags |=3D TNF_MIGRATE_FAIL; vmf->ptl =3D pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(oldpmd, *vmf->pmd))) { @@ -1732,8 +1724,8 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf) } =20 out: - if (nid !=3D NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, HPAGE_PMD_NR, flags); + if (target_nid !=3D NUMA_NO_NODE) + task_numa_fault(last_cpupid, target_nid, nr_pages, flags); =20 return 0; =20 diff --git a/mm/internal.h b/mm/internal.h index b4d86436565b..7782b7bb3383 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -1217,8 +1217,9 @@ void vunmap_range_noflush(unsigned long start, unsign= ed long end); =20 void __vunmap_range_noflush(unsigned long start, unsigned long end); =20 -int numa_migrate_prep(struct folio *folio, struct vm_fault *vmf, - unsigned long addr, int page_nid, int *flags); +int numa_migrate_check(struct folio *folio, struct vm_fault *vmf, + unsigned long addr, bool writable, + int *flags, int *last_cpupid); =20 void free_zone_device_folio(struct folio *folio); int migrate_device_coherent_page(struct page *page); diff --git a/mm/memory.c b/mm/memory.c index 96c2f5b3d796..a252c0f13755 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5209,16 +5209,42 @@ static vm_fault_t do_fault(struct vm_fault *vmf) return ret; } =20 -int numa_migrate_prep(struct folio *folio, struct vm_fault *vmf, - unsigned long addr, int page_nid, int *flags) +int numa_migrate_check(struct folio *folio, struct vm_fault *vmf, + unsigned long addr, bool writable, + int *flags, int *last_cpupid) { struct vm_area_struct *vma =3D vmf->vma; =20 + /* + * Avoid grouping on RO pages in general. RO pages shouldn't hurt as + * much anyway since they can be in shared cache state. This misses + * the case where a mapping is writable but the process never writes + * to it but pte_write gets cleared during protection updates and + * pte_dirty has unpredictable behaviour between PTE scan updates, + * background writeback, dirty balancing and application behaviour. + */ + if (!writable) + *flags |=3D TNF_NO_GROUP; + + /* + * Flag if the folio is shared between multiple address spaces. This + * is later used when determining whether to group tasks together + */ + if (folio_likely_mapped_shared(folio) && (vma->vm_flags & VM_SHARED)) + *flags |=3D TNF_SHARED; + + /* + * For memory tiering mode, cpupid of slow memory page is used + * to record page access time. + */ + if (folio_has_cpupid(folio)) + *last_cpupid =3D folio_last_cpupid(folio); + /* Record the current PID acceesing VMA */ vma_set_access_pid_bit(vma); =20 count_vm_numa_event(NUMA_HINT_FAULTS); - if (page_nid =3D=3D numa_node_id()) { + if (folio_nid(folio) =3D=3D numa_node_id()) { count_vm_numa_event(NUMA_HINT_FAULTS_LOCAL); *flags |=3D TNF_FAULT_LOCAL; } @@ -5284,12 +5310,11 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) { struct vm_area_struct *vma =3D vmf->vma; struct folio *folio =3D NULL; - int nid =3D NUMA_NO_NODE; + int target_nid =3D NUMA_NO_NODE; bool writable =3D false, ignore_writable =3D false; bool pte_write_upgrade =3D vma_wants_manual_pte_write_upgrade(vma); - int last_cpupid; - int target_nid; - pte_t pte, old_pte; + int last_cpupid =3D (-1 & LAST_CPUPID_MASK); + pte_t pte, old_pte =3D vmf->orig_pte; int flags =3D 0, nr_pages; =20 /* @@ -5297,10 +5322,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) * table lock, that its contents have not changed during fault handling. */ spin_lock(vmf->ptl); - /* Read the live PTE from the page tables: */ - old_pte =3D ptep_get(vmf->pte); - - if (unlikely(!pte_same(old_pte, vmf->orig_pte))) { + if (unlikely(!pte_same(old_pte, *vmf->pte))) { pte_unmap_unlock(vmf->pte, vmf->ptl); goto out; } @@ -5320,35 +5342,10 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) if (!folio || folio_is_zone_device(folio)) goto out_map; =20 - /* - * Avoid grouping on RO pages in general. RO pages shouldn't hurt as - * much anyway since they can be in shared cache state. This misses - * the case where a mapping is writable but the process never writes - * to it but pte_write gets cleared during protection updates and - * pte_dirty has unpredictable behaviour between PTE scan updates, - * background writeback, dirty balancing and application behaviour. - */ - if (!writable) - flags |=3D TNF_NO_GROUP; - - /* - * Flag if the folio is shared between multiple address spaces. This - * is later used when determining whether to group tasks together - */ - if (folio_likely_mapped_shared(folio) && (vma->vm_flags & VM_SHARED)) - flags |=3D TNF_SHARED; - - nid =3D folio_nid(folio); nr_pages =3D folio_nr_pages(folio); - /* - * For memory tiering mode, cpupid of slow memory page is used - * to record page access time. So use default value. - */ - if (!folio_has_cpupid(folio)) - last_cpupid =3D (-1 & LAST_CPUPID_MASK); - else - last_cpupid =3D folio_last_cpupid(folio); - target_nid =3D numa_migrate_prep(folio, vmf, vmf->address, nid, &flags); + + target_nid =3D numa_migrate_check(folio, vmf, vmf->address, writable, + &flags, &last_cpupid); if (target_nid =3D=3D NUMA_NO_NODE) goto out_map; if (migrate_misplaced_folio_prepare(folio, vma, target_nid)) { @@ -5362,9 +5359,9 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) =20 /* Migrate to the requested node */ if (!migrate_misplaced_folio(folio, vma, target_nid)) { - nid =3D target_nid; flags |=3D TNF_MIGRATED; } else { + target_nid =3D NUMA_NO_NODE; flags |=3D TNF_MIGRATE_FAIL; vmf->pte =3D pte_offset_map_lock(vma->vm_mm, vmf->pmd, vmf->address, &vmf->ptl); @@ -5378,8 +5375,8 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf) } =20 out: - if (nid !=3D NUMA_NO_NODE) - task_numa_fault(last_cpupid, nid, nr_pages, flags); + if (target_nid !=3D NUMA_NO_NODE) + task_numa_fault(last_cpupid, target_nid, nr_pages, flags); return 0; out_map: /* --=20 2.43.0