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[107.3.138.210]) by smtp.gmail.com with ESMTPSA id k5sm4157369pjj.37.2020.11.10.10.13.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Nov 2020 10:13:06 -0800 (PST) From: Yang Shi To: mhocko@suse.com, ziy@nvidia.com, songliubraving@fb.com, mgorman@suse.de, jack@suse.cz, akpm@linux-foundation.org Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [v2 PATCH 3/5] mm: migrate: skip shared exec THP for NUMA balancing Date: Tue, 10 Nov 2020 10:12:48 -0800 Message-Id: <20201110181250.264394-4-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201110181250.264394-1-shy828301@gmail.com> References: <20201110181250.264394-1-shy828301@gmail.com> MIME-Version: 1.0 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 NUMA balancing skip shared exec base page. Since CONFIG_READ_ONLY_THP_FOR_FS was introduced, there are probably shared exec THP, so skip such THPs for NUMA balancing as well. Signed-off-by: Yang Shi --- mm/migrate.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index d7167f7107bd..1b103e801fe4 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2069,6 +2069,16 @@ bool pmd_trans_migrating(pmd_t pmd) return PageLocked(page); } =20 +static inline bool is_shared_exec_page(struct vm_area_struct *vma, + struct page *page) +{ + if (page_mapcount(page) !=3D 1 && page_is_file_lru(page) && + (vma->vm_flags & VM_EXEC)) + return true; + + return false; +} + /* * Attempt to migrate a misplaced page to the specified destination * node. Caller is expected to have an elevated reference count on @@ -2086,8 +2096,7 @@ int migrate_misplaced_page(struct page *page, struc= t vm_area_struct *vma, * Don't migrate file pages that are mapped in multiple processes * with execute permissions as they are probably shared libraries. */ - if (page_mapcount(page) !=3D 1 && page_is_file_lru(page) && - (vma->vm_flags & VM_EXEC)) + if (is_shared_exec_page(vma, page)) goto out; =20 /* @@ -2142,6 +2151,10 @@ int migrate_misplaced_transhuge_page(struct mm_str= uct *mm, int page_lru =3D page_is_file_lru(page); unsigned long start =3D address & HPAGE_PMD_MASK; =20 + if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && + is_shared_exec_page(vma, page)) + goto out; + new_page =3D alloc_pages_node(node, (GFP_TRANSHUGE_LIGHT | __GFP_THISNODE), HPAGE_PMD_ORDER); @@ -2253,6 +2266,7 @@ int migrate_misplaced_transhuge_page(struct mm_stru= ct *mm, =20 out_unlock: unlock_page(page); +out: put_page(page); return 0; } --=20 2.26.2