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Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH 2/2] mm: memory-failure: kill __soft_offline_page() Content-Language: en-US To: =?UTF-8?B?SE9SSUdVQ0hJIE5BT1lBKOWggOWPoyDnm7TkuZ8p?= CC: Miaohe Lin , Andrew Morton , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" References: <20220819033402.156519-1-wangkefeng.wang@huawei.com> <20220819033402.156519-2-wangkefeng.wang@huawei.com> <20220830071514.GA1106752@hori.linux.bs1.fc.nec.co.jp> From: Kefeng Wang In-Reply-To: <20220830071514.GA1106752@hori.linux.bs1.fc.nec.co.jp> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1661851577; a=rsa-sha256; cv=none; b=5+ib+28+fuHfLqwJ70XSt+ZDQTNySqvhEupNpUcRFpKUtxOa9NhcGsBRpWAQ5Y8NAcQe3w M4D4kwnDnHlT45gBiLSPSRo6m6RIKLmtRh2B1u6vtEDhpFqPwoArpaE5FeLxzAmmzYNIxw vOKiRKxMmSLufUtjlxnZ7sOd/ZVuEdI= ARC-Authentication-Results: i=1; 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dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf10.hostedemail.com: domain of wangkefeng.wang@huawei.com designates 45.249.212.255 as permitted sender) smtp.mailfrom=wangkefeng.wang@huawei.com X-HE-Tag: 1661851577-98287 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: On 2022/8/30 15:15, HORIGUCHI NAOYA(堀口 直也) wrote: > On Fri, Aug 19, 2022 at 11:34:02AM +0800, Kefeng Wang wrote: >> Squash the __soft_offline_page() into soft_offline_in_use_page() and >> kill __soft_offline_page(). >> >> Signed-off-by: Kefeng Wang >> --- >> mm/memory-failure.c | 24 +++++++++--------------- >> 1 file changed, 9 insertions(+), 15 deletions(-) >> >> diff --git a/mm/memory-failure.c b/mm/memory-failure.c >> index 1a7d6548ccb2..5b368124956d 100644 >> --- a/mm/memory-failure.c >> +++ b/mm/memory-failure.c >> @@ -2432,11 +2432,11 @@ static bool isolate_page(struct page *page, struct list_head *pagelist) >> } >> >> /* >> - * __soft_offline_page handles hugetlb-pages and non-hugetlb pages. >> + * soft_offline_in_use_page handles hugetlb-pages and non-hugetlb pages. >> * If the page is a non-dirty unmapped page-cache page, it simply invalidates. >> * If the page is mapped, it migrates the contents over. >> */ >> -static int __soft_offline_page(struct page *page) >> +static int soft_offline_in_use_page(struct page *page) >> { >> long ret = 0; >> unsigned long pfn = page_to_pfn(page); >> @@ -2449,6 +2449,13 @@ static int __soft_offline_page(struct page *page) >> .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, >> }; >> >> + if (!huge && PageTransHuge(hpage)) { >> + if (try_to_split_thp_page(page)) { >> + pr_info("soft offline: %#lx: thp split failed\n", pfn); >> + return -EBUSY; >> + } > I've found that this change causes a regression. After the thp is > successfully split here, hpage no longer points to a proper page. > So hpage should be updated to point to the raw error page. > > + hpage = page; Sorry for the regression,  will update. > > Could you update the patch? > > Thanks, > Naoya Horiguchi