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AJvYcCW/dl7lIka+R3BgcRgU5W/j+BaVZYzWhtoFJqitoI4pCvrRX1+AFUUZMynbtgoCo6aZqfjrYNLL0gm3FTrdWLmYZ/ySy5yYlVPREC0m X-Gm-Message-State: AOJu0Yyp/F4MVu3+UeAbIMDTdjHn8m55NokMGNx90cuYCuxwsBnZLKzB Igqv4fuYG6i1T7a2mJcTjtggHLJkuh3A86WcizGI1YqPYvbo4mMLjqjAUexRfqY= X-Received: by 2002:a6b:c9d8:0:b0:7bf:cc4d:ea53 with SMTP id z207-20020a6bc9d8000000b007bfcc4dea53mr4665474iof.0.1706774757261; Thu, 01 Feb 2024 00:05:57 -0800 (PST) Received: from C02DW0BEMD6R.bytedance.net ([203.208.167.153]) by smtp.gmail.com with ESMTPSA id d14-20020a056a00198e00b006de1da4ca81sm8389738pfl.55.2024.02.01.00.05.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 01 Feb 2024 00:05:56 -0800 (PST) From: Qi Zheng To: akpm@linux-foundation.org, arnd@arndb.de Cc: muchun.song@linux.dev, david@redhat.com, willy@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Qi Zheng Subject: [PATCH 1/2] mm: pgtable: add missing flag and statistics for kernel PTE page Date: Thu, 1 Feb 2024 16:05:40 +0800 Message-Id: X-Mailer: git-send-email 2.24.3 (Apple Git-128) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1789683121438311937 X-GMAIL-MSGID: 1789683121438311937 For kernel PTE page, we do not need to allocate and initialize its split ptlock, but as a page table page, it's still necessary to add PG_table flag and NR_PAGETABLE statistics for it. Signed-off-by: Qi Zheng Reviewed-by: Muchun Song --- include/asm-generic/pgalloc.h | 7 ++++++- include/linux/mm.h | 21 ++++++++++++++++----- 2 files changed, 22 insertions(+), 6 deletions(-) diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h index 879e5f8aa5e9..908bd9140ac2 100644 --- a/include/asm-generic/pgalloc.h +++ b/include/asm-generic/pgalloc.h @@ -23,6 +23,8 @@ static inline pte_t *__pte_alloc_one_kernel(struct mm_struct *mm) if (!ptdesc) return NULL; + + __pagetable_pte_ctor(ptdesc); return ptdesc_address(ptdesc); } @@ -46,7 +48,10 @@ static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm) */ static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) { - pagetable_free(virt_to_ptdesc(pte)); + struct ptdesc *ptdesc = virt_to_ptdesc(pte); + + __pagetable_pte_dtor(ptdesc); + pagetable_free(ptdesc); } /** diff --git a/include/linux/mm.h b/include/linux/mm.h index e442fd0efdd9..e37db032764e 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2922,26 +2922,37 @@ static inline bool ptlock_init(struct ptdesc *ptdesc) { return true; } static inline void ptlock_free(struct ptdesc *ptdesc) {} #endif /* USE_SPLIT_PTE_PTLOCKS */ -static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc) +static inline void __pagetable_pte_ctor(struct ptdesc *ptdesc) { struct folio *folio = ptdesc_folio(ptdesc); - if (!ptlock_init(ptdesc)) - return false; __folio_set_pgtable(folio); lruvec_stat_add_folio(folio, NR_PAGETABLE); +} + +static inline bool pagetable_pte_ctor(struct ptdesc *ptdesc) +{ + if (!ptlock_init(ptdesc)) + return false; + + __pagetable_pte_ctor(ptdesc); return true; } -static inline void pagetable_pte_dtor(struct ptdesc *ptdesc) +static inline void __pagetable_pte_dtor(struct ptdesc *ptdesc) { struct folio *folio = ptdesc_folio(ptdesc); - ptlock_free(ptdesc); __folio_clear_pgtable(folio); lruvec_stat_sub_folio(folio, NR_PAGETABLE); } +static inline void pagetable_pte_dtor(struct ptdesc *ptdesc) +{ + ptlock_free(ptdesc); + __pagetable_pte_dtor(ptdesc); +} + pte_t *__pte_offset_map(pmd_t *pmd, unsigned long addr, pmd_t *pmdvalp); static inline pte_t *pte_offset_map(pmd_t *pmd, unsigned long addr) {