From patchwork Sat Mar 6 03:29:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12119741 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EEC79C433E0 for ; Sat, 6 Mar 2021 03:30:27 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4186A64FED for ; Sat, 6 Mar 2021 03:30:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4186A64FED Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C69296B006C; Fri, 5 Mar 2021 22:30:25 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B01206B0071; Fri, 5 Mar 2021 22:30:25 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8CAC76B006E; Fri, 5 Mar 2021 22:30:25 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0168.hostedemail.com [216.40.44.168]) by kanga.kvack.org (Postfix) with ESMTP id 6B3F26B006C for ; Fri, 5 Mar 2021 22:30:25 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 22551180279AB for ; Sat, 6 Mar 2021 03:30:25 +0000 (UTC) X-FDA: 77888021610.08.91CC6B4 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) by imf02.hostedemail.com (Postfix) with ESMTP id 2299A407F8FE for ; Sat, 6 Mar 2021 03:30:20 +0000 (UTC) Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4Dsqnc4N6TzjWtq; Sat, 6 Mar 2021 11:28:36 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Sat, 6 Mar 2021 11:30:14 +0800 From: Miaohe Lin To: , CC: , , , , , Subject: [PATCH v2 1/4] khugepaged: remove unneeded return value of khugepaged_collapse_pte_mapped_thps() Date: Fri, 5 Mar 2021 22:29:44 -0500 Message-ID: <20210306032947.35921-2-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20210306032947.35921-1-linmiaohe@huawei.com> References: <20210306032947.35921-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected X-Stat-Signature: p4ac3iri6e78rn4p47i9j5ykabfb1gz6 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 2299A407F8FE Received-SPF: none (huawei.com>: No applicable sender policy available) receiver=imf02; identity=mailfrom; envelope-from=""; helo=szxga05-in.huawei.com; client-ip=45.249.212.191 X-HE-DKIM-Result: none/none X-HE-Tag: 1615001420-400164 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 return value of khugepaged_collapse_pte_mapped_thps() is never checked since it's introduced. We should remove such unneeded return value. Signed-off-by: Miaohe Lin Acked-by: Kirill A. Shutemov --- mm/khugepaged.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a7d6cb912b05..d43812c5ce16 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1533,16 +1533,16 @@ void collapse_pte_mapped_thp(struct mm_struct *mm, unsigned long addr) goto drop_hpage; } -static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot) +static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot) { struct mm_struct *mm = mm_slot->mm; int i; if (likely(mm_slot->nr_pte_mapped_thp == 0)) - return 0; + return; if (!mmap_write_trylock(mm)) - return -EBUSY; + return; if (unlikely(khugepaged_test_exit(mm))) goto out; @@ -1553,7 +1553,6 @@ static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot) out: mm_slot->nr_pte_mapped_thp = 0; mmap_write_unlock(mm); - return 0; } static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff) @@ -2057,9 +2056,8 @@ static void khugepaged_scan_file(struct mm_struct *mm, BUILD_BUG(); } -static int khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot) +static void khugepaged_collapse_pte_mapped_thps(struct mm_slot *mm_slot) { - return 0; } #endif From patchwork Sat Mar 6 03:29:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12119745 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53733C433E0 for ; Sat, 6 Mar 2021 03:30:32 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E04AD64FF2 for ; Sat, 6 Mar 2021 03:30:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E04AD64FF2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 11E566B0078; Fri, 5 Mar 2021 22:30:30 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id F23006B0073; Fri, 5 Mar 2021 22:30:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C89EA6B0075; Fri, 5 Mar 2021 22:30:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0179.hostedemail.com [216.40.44.179]) by kanga.kvack.org (Postfix) with ESMTP id A53FE6B0072 for ; Fri, 5 Mar 2021 22:30:29 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 634418249980 for ; Sat, 6 Mar 2021 03:30:29 +0000 (UTC) X-FDA: 77888021778.09.F1D3AC2 Received: from szxga06-in.huawei.com (szxga06-in.huawei.com [45.249.212.32]) by imf10.hostedemail.com (Postfix) with ESMTP id A019D407F8DB for ; Sat, 6 Mar 2021 03:30:26 +0000 (UTC) Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4Dsqp457HZzjVCQ; Sat, 6 Mar 2021 11:29:00 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Sat, 6 Mar 2021 11:30:14 +0800 From: Miaohe Lin To: , CC: , , , , , Subject: [PATCH v2 2/4] khugepaged: reuse the smp_wmb() inside __SetPageUptodate() Date: Fri, 5 Mar 2021 22:29:45 -0500 Message-ID: <20210306032947.35921-3-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20210306032947.35921-1-linmiaohe@huawei.com> References: <20210306032947.35921-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected X-Stat-Signature: juh4bf7fmskdwbg5q4hbhhmpxj8ku9wo X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: A019D407F8DB Received-SPF: none (huawei.com>: No applicable sender policy available) receiver=imf10; identity=mailfrom; envelope-from=""; helo=szxga06-in.huawei.com; client-ip=45.249.212.32 X-HE-DKIM-Result: none/none X-HE-Tag: 1615001426-316509 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: smp_wmb() is needed to avoid the copy_huge_page writes to become visible after the set_pmd_at() write here. But we can reuse the smp_wmb() inside __SetPageUptodate() to remove this redundant one. Signed-off-by: Miaohe Lin Acked-by: Kirill A. Shutemov --- mm/khugepaged.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index d43812c5ce16..287e7ecf978c 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -1183,19 +1183,18 @@ static void collapse_huge_page(struct mm_struct *mm, __collapse_huge_page_copy(pte, new_page, vma, address, pte_ptl, &compound_pagelist); pte_unmap(pte); + /* + * spin_lock() below is not the equivalent of smp_wmb(), but + * the smp_wmb() inside __SetPageUptodate() can be reused to + * avoid the copy_huge_page writes to become visible after + * the set_pmd_at() write. + */ __SetPageUptodate(new_page); pgtable = pmd_pgtable(_pmd); _pmd = mk_huge_pmd(new_page, vma->vm_page_prot); _pmd = maybe_pmd_mkwrite(pmd_mkdirty(_pmd), vma); - /* - * spin_lock() below is not the equivalent of smp_wmb(), so - * this is needed to avoid the copy_huge_page writes to become - * visible after the set_pmd_at() write. - */ - smp_wmb(); - spin_lock(pmd_ptl); BUG_ON(!pmd_none(*pmd)); page_add_new_anon_rmap(new_page, vma, address, true); From patchwork Sat Mar 6 03:29:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12119747 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76841C433E6 for ; Sat, 6 Mar 2021 03:30:34 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 03C0464FF2 for ; Sat, 6 Mar 2021 03:30:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 03C0464FF2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 3B3396B0073; Fri, 5 Mar 2021 22:30:30 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 11BE96B0072; Fri, 5 Mar 2021 22:30:30 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D4C936B0074; Fri, 5 Mar 2021 22:30:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0193.hostedemail.com [216.40.44.193]) by kanga.kvack.org (Postfix) with ESMTP id AE4426B0073 for ; Fri, 5 Mar 2021 22:30:29 -0500 (EST) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 7B9FE824999B for ; Sat, 6 Mar 2021 03:30:29 +0000 (UTC) X-FDA: 77888021778.02.9FE378F Received: from szxga06-in.huawei.com (szxga06-in.huawei.com [45.249.212.32]) by imf25.hostedemail.com (Postfix) with ESMTP id 897836000101 for ; Sat, 6 Mar 2021 03:30:27 +0000 (UTC) Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4Dsqp45NdlzjVSn; Sat, 6 Mar 2021 11:29:00 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Sat, 6 Mar 2021 11:30:15 +0800 From: Miaohe Lin To: , CC: , , , , , Subject: [PATCH v2 3/4] khugepaged: use helper khugepaged_test_exit() in __khugepaged_enter() Date: Fri, 5 Mar 2021 22:29:46 -0500 Message-ID: <20210306032947.35921-4-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20210306032947.35921-1-linmiaohe@huawei.com> References: <20210306032947.35921-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected X-Stat-Signature: dwwdih99oimjqfea1yufg5cfrwhhqkdk X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 897836000101 Received-SPF: none (huawei.com>: No applicable sender policy available) receiver=imf25; identity=mailfrom; envelope-from=""; helo=szxga06-in.huawei.com; client-ip=45.249.212.32 X-HE-DKIM-Result: none/none X-HE-Tag: 1615001427-640706 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: Commit 4d45e75a9955 ("mm: remove the now-unnecessary mmget_still_valid() hack") have made khugepaged_test_exit() suitable for check mm->mm_users against 0. Use this helper here. Signed-off-by: Miaohe Lin Acked-by: Kirill A. Shutemov --- mm/khugepaged.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 287e7ecf978c..e886a8618c33 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -481,7 +481,7 @@ int __khugepaged_enter(struct mm_struct *mm) return -ENOMEM; /* __khugepaged_exit() must not run from under us */ - VM_BUG_ON_MM(atomic_read(&mm->mm_users) == 0, mm); + VM_BUG_ON_MM(khugepaged_test_exit(mm), mm); if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags))) { free_mm_slot(mm_slot); return 0; From patchwork Sat Mar 6 03:29:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miaohe Lin X-Patchwork-Id: 12119743 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53F39C433E6 for ; Sat, 6 Mar 2021 03:30:30 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E134464FF2 for ; Sat, 6 Mar 2021 03:30:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E134464FF2 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7FA186B0071; Fri, 5 Mar 2021 22:30:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 757F76B0072; Fri, 5 Mar 2021 22:30:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5AB966B0073; Fri, 5 Mar 2021 22:30:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0193.hostedemail.com [216.40.44.193]) by kanga.kvack.org (Postfix) with ESMTP id 386316B0071 for ; Fri, 5 Mar 2021 22:30:29 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id E7295180279B8 for ; Sat, 6 Mar 2021 03:30:28 +0000 (UTC) X-FDA: 77888021736.09.10BFB6F Received: from szxga06-in.huawei.com (szxga06-in.huawei.com [45.249.212.32]) by imf04.hostedemail.com (Postfix) with ESMTP id 8263813A for ; Sat, 6 Mar 2021 03:30:27 +0000 (UTC) Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4Dsqp45dSkzjVb2; Sat, 6 Mar 2021 11:29:00 +0800 (CST) Received: from huawei.com (10.175.104.175) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Sat, 6 Mar 2021 11:30:16 +0800 From: Miaohe Lin To: , CC: , , , , , Subject: [PATCH v2 4/4] khugepaged: fix wrong result value for trace_mm_collapse_huge_page_isolate() Date: Fri, 5 Mar 2021 22:29:47 -0500 Message-ID: <20210306032947.35921-5-linmiaohe@huawei.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20210306032947.35921-1-linmiaohe@huawei.com> References: <20210306032947.35921-1-linmiaohe@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.104.175] X-CFilter-Loop: Reflected X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 8263813A X-Stat-Signature: gw9tfib5ru1a6o6pxrk53owdcacyuuis Received-SPF: none (huawei.com>: No applicable sender policy available) receiver=imf04; identity=mailfrom; envelope-from=""; helo=szxga06-in.huawei.com; client-ip=45.249.212.32 X-HE-DKIM-Result: none/none X-HE-Tag: 1615001427-898560 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: In writable and !referenced case, the result value should be SCAN_LACK_REFERENCED_PAGE for trace_mm_collapse_huge_page_isolate() instead of default 0 (SCAN_FAIL) here. Fixes: 7d2eba0557c1 ("mm: add tracepoint for scanning pages") Signed-off-by: Miaohe Lin Acked-by: Kirill A. Shutemov --- mm/khugepaged.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index e886a8618c33..adf677246d86 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -716,17 +716,17 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, if (pte_write(pteval)) writable = true; } - if (likely(writable)) { - if (likely(referenced)) { - result = SCAN_SUCCEED; - trace_mm_collapse_huge_page_isolate(page, none_or_zero, - referenced, writable, result); - return 1; - } - } else { + + if (unlikely(!writable)) { result = SCAN_PAGE_RO; + } else if (unlikely(!referenced)) { + result = SCAN_LACK_REFERENCED_PAGE; + } else { + result = SCAN_SUCCEED; + trace_mm_collapse_huge_page_isolate(page, none_or_zero, + referenced, writable, result); + return 1; } - out: release_pte_pages(pte, _pte, compound_pagelist); trace_mm_collapse_huge_page_isolate(page, none_or_zero,