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[73.93.239.127]) by smtp.gmail.com with ESMTPSA id x11sm1151158pjh.0.2021.03.29.11.33.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Mar 2021 11:33:53 -0700 (PDT) From: Yang Shi To: mgorman@suse.de, kirill.shutemov@linux.intel.com, ziy@nvidia.com, mhocko@suse.com, ying.huang@intel.com, hughd@google.com, hca@linux.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, akpm@linux-foundation.org Cc: shy828301@gmail.com, linux-mm@kvack.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 6/6] mm: migrate: remove redundant page count check for THP Date: Mon, 29 Mar 2021 11:33:12 -0700 Message-Id: <20210329183312.178266-7-shy828301@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210329183312.178266-1-shy828301@gmail.com> References: <20210329183312.178266-1-shy828301@gmail.com> MIME-Version: 1.0 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D71CDA0003B2 X-Stat-Signature: figo1egb6s9zgr4t74hexm6zgpfwsna1 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf07; identity=mailfrom; envelope-from=""; helo=mail-pl1-f172.google.com; client-ip=209.85.214.172 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617042834-230932 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: Don't have to keep the redundant page count check for THP anymore after switching to use generic migration code. Signed-off-by: Yang Shi --- mm/migrate.c | 12 ------------ 1 file changed, 12 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index 1c0c873375ab..328f76848d6c 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2097,18 +2097,6 @@ static int numamigrate_isolate_page(pg_data_t *pgd= at, struct page *page) if (isolate_lru_page(page)) return 0; =20 - /* - * migrate_misplaced_transhuge_page() skips page migration's usual - * check on page_count(), so we must do it here, now that the page - * has been isolated: a GUP pin, or any other pin, prevents migration. - * The expected page count is 3: 1 for page's mapcount and 1 for the - * caller's pin and 1 for the reference taken by isolate_lru_page(). - */ - if (PageTransHuge(page) && page_count(page) !=3D 3) { - putback_lru_page(page); - return 0; - } - page_lru =3D page_is_file_lru(page); mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru, thp_nr_pages(page)); --=20 2.26.2