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Wed, 14 Jul 2021 02:21:21 -0700 (PDT) Received: from localhost.localdomain ([139.177.225.243]) by smtp.gmail.com with ESMTPSA id k19sm1742540pji.32.2021.07.14.02.21.16 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Jul 2021 02:21:21 -0700 (PDT) From: Muchun Song To: mike.kravetz@oracle.com, akpm@linux-foundation.org, osalvador@suse.de, mhocko@suse.com, song.bao.hua@hisilicon.com, david@redhat.com, chenhuang5@huawei.com, bodeddub@amazon.com, corbet@lwn.net Cc: duanxiongchun@bytedance.com, fam.zheng@bytedance.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, zhengqi.arch@bytedance.com, Muchun Song Subject: [PATCH 5/5] mm: sparsemem: use page table lock to protect kernel pmd operations Date: Wed, 14 Jul 2021 17:18:00 +0800 Message-Id: <20210714091800.42645-6-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20210714091800.42645-1-songmuchun@bytedance.com> References: <20210714091800.42645-1-songmuchun@bytedance.com> MIME-Version: 1.0 Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=bytedance-com.20150623.gappssmtp.com header.s=20150623 header.b=hWbxjhh0; spf=pass (imf30.hostedemail.com: domain of songmuchun@bytedance.com designates 209.85.214.174 as permitted sender) smtp.mailfrom=songmuchun@bytedance.com; dmarc=pass (policy=none) header.from=bytedance.com X-Rspamd-Server: rspam02 X-Stat-Signature: jcipmtx516idr33oyouiheq5c8y67jrp X-Rspamd-Queue-Id: D99D2E001816 X-HE-Tag: 1626254482-33044 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The init_mm.page_table_lock is used to protect kernel page tables, we can use it to serialize splitting vmemmap PMD mappings instead of mmap write lock, which can increase the concurrency of vmemmap_remap_free(). Signed-off-by: Muchun Song --- mm/ptdump.c | 16 ++++++++++++---- mm/sparse-vmemmap.c | 49 ++++++++++++++++++++++++++++++++++-------------= -- 2 files changed, 46 insertions(+), 19 deletions(-) diff --git a/mm/ptdump.c b/mm/ptdump.c index da751448d0e4..eea3d28d173c 100644 --- a/mm/ptdump.c +++ b/mm/ptdump.c @@ -40,8 +40,10 @@ static int ptdump_pgd_entry(pgd_t *pgd, unsigned long = addr, if (st->effective_prot) st->effective_prot(st, 0, pgd_val(val)); =20 - if (pgd_leaf(val)) + if (pgd_leaf(val)) { st->note_page(st, addr, 0, pgd_val(val)); + walk->action =3D ACTION_CONTINUE; + } =20 return 0; } @@ -61,8 +63,10 @@ static int ptdump_p4d_entry(p4d_t *p4d, unsigned long = addr, if (st->effective_prot) st->effective_prot(st, 1, p4d_val(val)); =20 - if (p4d_leaf(val)) + if (p4d_leaf(val)) { st->note_page(st, addr, 1, p4d_val(val)); + walk->action =3D ACTION_CONTINUE; + } =20 return 0; } @@ -82,8 +86,10 @@ static int ptdump_pud_entry(pud_t *pud, unsigned long = addr, if (st->effective_prot) st->effective_prot(st, 2, pud_val(val)); =20 - if (pud_leaf(val)) + if (pud_leaf(val)) { st->note_page(st, addr, 2, pud_val(val)); + walk->action =3D ACTION_CONTINUE; + } =20 return 0; } @@ -101,8 +107,10 @@ static int ptdump_pmd_entry(pmd_t *pmd, unsigned lon= g addr, =20 if (st->effective_prot) st->effective_prot(st, 3, pmd_val(val)); - if (pmd_leaf(val)) + if (pmd_leaf(val)) { st->note_page(st, addr, 3, pmd_val(val)); + walk->action =3D ACTION_CONTINUE; + } =20 return 0; } diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c index 62e3d20648ce..e636943ccfc4 100644 --- a/mm/sparse-vmemmap.c +++ b/mm/sparse-vmemmap.c @@ -64,8 +64,8 @@ struct vmemmap_remap_walk { */ #define NR_RESET_STRUCT_PAGE 3 =20 -static int split_vmemmap_huge_pmd(pmd_t *pmd, unsigned long start, - struct vmemmap_remap_walk *walk) +static int __split_vmemmap_huge_pmd(pmd_t *pmd, unsigned long start, + struct vmemmap_remap_walk *walk) { pmd_t __pmd; int i; @@ -87,15 +87,37 @@ static int split_vmemmap_huge_pmd(pmd_t *pmd, unsigne= d long start, set_pte_at(&init_mm, addr, pte, entry); } =20 - /* Make pte visible before pmd. See comment in __pte_alloc(). */ - smp_wmb(); - pmd_populate_kernel(&init_mm, pmd, pgtable); + spin_lock(&init_mm.page_table_lock); + if (likely(pmd_leaf(*pmd))) { + /* Make pte visible before pmd. See comment in __pte_alloc(). */ + smp_wmb(); + pmd_populate_kernel(&init_mm, pmd, pgtable); + flush_tlb_kernel_range(start, start + PMD_SIZE); + spin_unlock(&init_mm.page_table_lock); =20 - flush_tlb_kernel_range(start, start + PMD_SIZE); + return 0; + } + spin_unlock(&init_mm.page_table_lock); + pte_free_kernel(&init_mm, pgtable); =20 return 0; } =20 +static int split_vmemmap_huge_pmd(pmd_t *pmd, unsigned long start, + struct vmemmap_remap_walk *walk) +{ + int ret; + + spin_lock(&init_mm.page_table_lock); + ret =3D pmd_leaf(*pmd); + spin_unlock(&init_mm.page_table_lock); + + if (ret) + ret =3D __split_vmemmap_huge_pmd(pmd, start, walk); + + return ret; +} + static void vmemmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct vmemmap_remap_walk *walk) @@ -132,13 +154,12 @@ static int vmemmap_pmd_range(pud_t *pud, unsigned l= ong addr, =20 pmd =3D pmd_offset(pud, addr); do { - if (pmd_leaf(*pmd)) { - int ret; + int ret; + + ret =3D split_vmemmap_huge_pmd(pmd, addr & PMD_MASK, walk); + if (ret) + return ret; =20 - ret =3D split_vmemmap_huge_pmd(pmd, addr & PMD_MASK, walk); - if (ret) - return ret; - } next =3D pmd_addr_end(addr, end); vmemmap_pte_range(pmd, addr, next, walk); } while (pmd++, addr =3D next, addr !=3D end); @@ -321,10 +342,8 @@ int vmemmap_remap_free(unsigned long start, unsigned= long end, */ BUG_ON(start - reuse !=3D PAGE_SIZE); =20 - mmap_write_lock(&init_mm); + mmap_read_lock(&init_mm); ret =3D vmemmap_remap_range(reuse, end, &walk); - mmap_write_downgrade(&init_mm); - if (ret && walk.nr_walked) { end =3D reuse + walk.nr_walked * PAGE_SIZE; /* --=20 2.11.0