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Tue, 28 May 2024 21:45:17 +0800 (CST) Received: from localhost.localdomain (10.175.112.125) by dggpemm100001.china.huawei.com (7.185.36.93) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.35; Tue, 28 May 2024 21:45:16 +0800 From: Kefeng Wang To: , CC: Tony Luck , Miaohe Lin , , Matthew Wilcox , David Hildenbrand , Muchun Song , Benjamin LaHaise , , Zi Yan , Jiaqi Yan , Hugh Dickins , Vishal Moola , Alistair Popple , Jane Chu , Oscar Salvador , Kefeng Wang Subject: [PATCH v3 1/5] mm: add folio_mc_copy() Date: Tue, 28 May 2024 21:45:09 +0800 Message-ID: <20240528134513.2283548-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240528134513.2283548-1-wangkefeng.wang@huawei.com> References: <20240528134513.2283548-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm100001.china.huawei.com (7.185.36.93) X-Rspam-User: X-Stat-Signature: oaph3nruguujyd19ukazk8aptq6wwsy4 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 1B24AC000D X-HE-Tag: 1716903920-256434 X-HE-Meta: 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 diqpdAC9 B31Kvl/2tIggoUM/MG/9D9i3HYmUYY08umNEFWcbAxQIb3HXibEW3ijUeq+Y7JpYAjRQiNZShvboIYhpZ7QnSagcoAux7C8WW9dV1kQzGrBcp8mkwNQF6P/CpFoe6gE8QWUZiYLCeoHRSHFmgmxxSoAM7XbFpjPoVBC6UelNsaWMqSh1/65gG+RC6EN9Ww+X+0QhAPjuaL97qCalILcckGEOZnm4j3WmKrwl3VaEoCGoGzj6M39qMuA6/0p8toiSCkXfX9AbD9QmBels= 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: List-Subscribe: List-Unsubscribe: Add a #MC variant of folio_copy() which uses copy_mc_highpage() to support #MC handled during folio copy, it will be used in folio migration soon. Signed-off-by: Kefeng Wang --- include/linux/mm.h | 1 + mm/util.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 12bf20ebae5a..0c78d67f787d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1321,6 +1321,7 @@ void put_pages_list(struct list_head *pages); void split_page(struct page *page, unsigned int order); void folio_copy(struct folio *dst, struct folio *src); +int folio_mc_copy(struct folio *dst, struct folio *src); unsigned long nr_free_buffer_pages(void); diff --git a/mm/util.c b/mm/util.c index c9e519e6811f..9462dbf7ce02 100644 --- a/mm/util.c +++ b/mm/util.c @@ -828,6 +828,26 @@ void folio_copy(struct folio *dst, struct folio *src) } EXPORT_SYMBOL(folio_copy); +int folio_mc_copy(struct folio *dst, struct folio *src) +{ + long nr = folio_nr_pages(src); + long i = 0; + int ret = 0; + + for (;;) { + if (copy_mc_highpage(folio_page(dst, i), folio_page(src, i))) { + ret = -EFAULT; + break; + } + if (++i == nr) + break; + cond_resched(); + } + + return ret; +} +EXPORT_SYMBOL(folio_mc_copy); + int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_GUESS; int sysctl_overcommit_ratio __read_mostly = 50; unsigned long sysctl_overcommit_kbytes __read_mostly;