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Mon, 18 Dec 2023 07:06:44 +0000 (UTC) X-FDA: 81579056328.01.2959066 Received: from out30-99.freemail.mail.aliyun.com (out30-99.freemail.mail.aliyun.com [115.124.30.99]) by imf27.hostedemail.com (Postfix) with ESMTP id 0CFDF40016 for ; Mon, 18 Dec 2023 07:06:38 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=alibaba.com; spf=pass (imf27.hostedemail.com: domain of xuyu@linux.alibaba.com designates 115.124.30.99 as permitted sender) smtp.mailfrom=xuyu@linux.alibaba.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1702883203; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=OhfIj0tCZWDij4enJLiTvcFQlDXw491c5ysQdCCUwNc=; b=4nH5zacJoh10ZfnWdsY8866AQgV5Mq5GcMdJiUgKvdZLiMZfv/NcJsQ5pVrvxFADXimo1k +u+AWA2/0sX3n1A+sHoqxPDfm7jmzv3m9XN3sl//ptl5LZHCFfV7BuHiiP1ENxfMtdI65R OQwmuBiAa77AE/anRwHazvSR/999epY= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=alibaba.com; spf=pass (imf27.hostedemail.com: domain of xuyu@linux.alibaba.com designates 115.124.30.99 as permitted sender) smtp.mailfrom=xuyu@linux.alibaba.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1702883203; a=rsa-sha256; cv=none; b=Nry4GB1IOALZvuCx8CLiT7WFO/WDKTrwNOyB3quOHY/rB/CPb9cCCXnpFbdM1gbffp0CJS DPck+28ogviHc0e5lSdHAllUmLbs09dtDA9zP/lyV6smhYQVo1F8jkq7kHX5qdKQwX0q8d 1Wx5ckuJZ0+ikt4ZMl9VWtxyu43xDV4= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R111e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045170;MF=xuyu@linux.alibaba.com;NM=1;PH=DS;RN=2;SR=0;TI=SMTPD_---0VygwMBj_1702883194; Received: from localhost(mailfrom:xuyu@linux.alibaba.com fp:SMTPD_---0VygwMBj_1702883194) by smtp.aliyun-inc.com; Mon, 18 Dec 2023 15:06:35 +0800 From: Xu Yu To: linux-mm@kvack.org Cc: david@redhat.com Subject: [PATCH v3 0/2] attempt to map anonymous pte-mapped THPs by pmds Date: Mon, 18 Dec 2023 15:06:31 +0800 Message-Id: X-Mailer: git-send-email 2.37.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 0CFDF40016 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: eik1poj4t77j86izo3rk6pas5ztuft5g X-HE-Tag: 1702883198-521339 X-HE-Meta: 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 dhseLD+w DIT8P701ROlWV0VKsKCKT63/YePm5v33YfelaMAL960hTylktoO6O/BwzUQGH+tvPRVCwOOuICVQ2qcb211k9RiqG9g== 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: Result of tools/testing/selftests/mm/cow.c tests: # [RUN] Basic COW after fork() when collapsing before fork() ok 145 No leak from parent into child # [RUN] Basic COW after fork() when collapsing after fork() (fully shared) ok 146 No leak from parent into child # [RUN] Basic COW after fork() when collapsing after fork() (lower shared) ok 147 No leak from parent into child # [RUN] Basic COW after fork() when collapsing after fork() (upper shared) ok 148 No leak from parent into child A long run (w/ CONFIG_DEBUG_VM enabled) shows no panic or memory leaks. Changes since v2: - Use folios in the new code, as suggested by David. - Handle folio refcount and rmap properly, as suggested by David. - minor modification includes 1) advance vma write lock, 2) remove redundant rollback logic, 3) clear old ptes in pgtable before deposit. Changes since v1: - Deal with PageAnonExclusive properly, as suggested by David. Xu Yu (2): mm/khugepaged: map RO non-exclusive pte-mapped anon THPs by pmds mm/khugepaged: map exclusive anonymous pte-mapped THPs by pmds mm/khugepaged.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 229 insertions(+) -- 2.37.1