From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,MSGID_FROM_MTA_HEADER, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 88929C433C1 for ; Mon, 22 Mar 2021 02:11:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E68DB61930 for ; Mon, 22 Mar 2021 02:11:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E68DB61930 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2BF1A6B0036; Sun, 21 Mar 2021 22:11:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 297426B006C; Sun, 21 Mar 2021 22:11:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 09C076B0070; Sun, 21 Mar 2021 22:11:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0116.hostedemail.com [216.40.44.116]) by kanga.kvack.org (Postfix) with ESMTP id DFA156B0036 for ; Sun, 21 Mar 2021 22:11:42 -0400 (EDT) Received: from smtpin34.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 9E1986D97 for ; Mon, 22 Mar 2021 02:11:42 +0000 (UTC) X-FDA: 77945884044.34.F54C8F8 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (mail-bn7nam10on2050.outbound.protection.outlook.com [40.107.92.50]) by imf07.hostedemail.com (Postfix) with ESMTP id AE6B8A0009C5 for ; Mon, 22 Mar 2021 02:11:41 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=O8L4hWew0k34dcD9BrX6/ImMwr9v2AWOcOHn+TEoYG08WI6iNO6agzAduwyt3SHe4p61ytNw/y0GN2d5ZQc+FalHER/v91AqR5A2V2ndGQrZEqdbL8YTMqs+ZE48dugI3WIQ7f+MaGRLkGkjJgqh0EusX2y5PqRQrGyBp3PINd/+5hhDECv8rEJR0PQ577jUXGafUB+gir7wp0Ka5J9LAD+PSYlH0pw7+Q5uWFafDrev3rOrrAR5I+z+agsxhPnPPuGzQVkQUDByk0KP1zrlEH/XpkSlcgbJmtOh19UpF8kjRZ3JPD/oc9BDDNTFUu1ZVfrdrvbDLLrQY0e15+oEoA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cNJeXlJmGMvJsSevTx9/wr7cb2Hr9XyO1Ua5EwyqOAo=; b=mYfCo6NbF1Q9fjNTLNq7Pyq4vCWfSUE3psO/6MJNdcPUTwgmD11UNTBBNBHON293HkBdvOPav3PjcdsEXGzlEmJRuI+d/NrDYEOXiC+OSVZEV2ShOkVIXbn4zgr4B80y6N6IOSjPIQoRzRQgprzDuOCXoCaJ3HUkii/bF0AQGRxp+VNRAuJXeG6D9vp45shTVPaELfBjMwP/C7z6HYHq85qB5oSqZOqr+h2h5mPpXC2i1osNfEqNkCDZOiv3VPzRNNga2MYMQivc0BQEUfasm3bjixqyblPAIFJNWE43B1u8J/6jk/n3g5uMgflLSxtn5vi3HemOzXlyncRtU+uqkA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cNJeXlJmGMvJsSevTx9/wr7cb2Hr9XyO1Ua5EwyqOAo=; b=rshdd5w8/x8R1A3tEegUyzOH+SnZkoUaeAYo5QYGisZnjMsg6AMfGWyLjs1DhBG0nmURRKdVrgWQY566BDL9jpfMfbc3k7vu7jWx/3QYq9vDNKfrMGo1/toA7B8jcXcFDIPdDGzJEWmIu6madjK4FTj9l7/+EJujaIOKsIR83PtkH37uKDc4vgdx1WB8xhOq5PQuviHawtgWApKHs+u+rLLsEySCfYESA/r336SCIP6ZNdpYxalgQlghB5opwXe1oigOgChSw3tPL5F+avTFySsOmmz1qcdSKRAq1mizCZHLFAH7mMLR5iovOFaen2yJS5+Ki8fLK9C9MPbgA9wehg== Authentication-Results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=nvidia.com; Received: from MN2PR12MB3823.namprd12.prod.outlook.com (2603:10b6:208:168::26) by MN2PR12MB4534.namprd12.prod.outlook.com (2603:10b6:208:24f::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3955.25; Mon, 22 Mar 2021 02:11:40 +0000 Received: from MN2PR12MB3823.namprd12.prod.outlook.com ([fe80::a1b1:5d8:47d7:4b60]) by MN2PR12MB3823.namprd12.prod.outlook.com ([fe80::a1b1:5d8:47d7:4b60%7]) with mapi id 15.20.3955.025; Mon, 22 Mar 2021 02:11:39 +0000 From: "Zi Yan" To: "Yang Shi" Cc: "Linux MM" , "Linux Kernel Mailing List" , linux-kselftest@vger.kernel.org, "Kirill A . Shutemov" , "Andrew Morton" , "Shuah Khan" , "John Hubbard" , "Sandipan Das" , "David Hildenbrand" , "Mika Penttila" Subject: Re: [PATCH v5 1/2] mm: huge_memory: a new debugfs interface for splitting THP tests. 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identity=mailfrom; envelope-from=""; helo=NAM10-BN7-obe.outbound.protection.outlook.com; client-ip=40.107.92.50 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616379101-62587 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: --=_MailMate_2CBEA0E7-C676-40B1-8BAE-0E87836D1426_= Content-Type: text/plain On 19 Mar 2021, at 19:37, Yang Shi wrote: > On Thu, Mar 18, 2021 at 5:52 PM Zi Yan wrote: >> >> From: Zi Yan >> >> We did not have a direct user interface of splitting the compound page >> backing a THP and there is no need unless we want to expose the THP >> implementation details to users. Make /split_huge_pages accept >> a new command to do that. >> >> By writing ",," to >> /split_huge_pages, THPs within the given virtual address range >> from the process with the given pid are split. It is used to test >> split_huge_page function. In addition, a selftest program is added to >> tools/testing/selftests/vm to utilize the interface by splitting >> PMD THPs and PTE-mapped THPs. >> >> This does not change the old behavior, i.e., writing 1 to the interface >> to split all THPs in the system. >> >> Changelog: >> >> From v5: >> 1. Skipped special VMAs and other fixes. (suggested by Yang Shi) > > Looks good to me. Reviewed-by: Yang Shi > > Some nits below: > >> >> From v4: >> 1. Fixed the error code return issue, spotted by kernel test robot >> . >> >> From v3: >> 1. Factored out split huge pages in the given pid code to a separate >> function. >> 2. Added the missing put_page for not split pages. >> 3. pr_debug -> pr_info, make reading results simpler. >> >> From v2: >> 1. Reused existing /split_huge_pages interface. (suggested by >> Yang Shi) >> >> From v1: >> 1. Removed unnecessary calling to vma_migratable, spotted by kernel test >> robot . >> 2. Dropped the use of find_mm_struct and code it directly, since there >> is no need for the permission check in that function and the function >> is only available when migration is on. >> 3. Added some comments in the selftest program to clarify how PTE-mapped >> THPs are formed. >> >> Signed-off-by: Zi Yan >> --- >> mm/huge_memory.c | 143 +++++++- >> tools/testing/selftests/vm/.gitignore | 1 + >> tools/testing/selftests/vm/Makefile | 1 + >> .../selftests/vm/split_huge_page_test.c | 318 ++++++++++++++++++ >> 4 files changed, 456 insertions(+), 7 deletions(-) >> create mode 100644 tools/testing/selftests/vm/split_huge_page_test.c >> >> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >> index bff92dea5ab3..9bf9bc489228 100644 >> --- a/mm/huge_memory.c >> +++ b/mm/huge_memory.c >> @@ -7,6 +7,7 @@ >> >> #include >> #include >> +#include >> #include >> #include >> #include >> @@ -2922,16 +2923,14 @@ static struct shrinker deferred_split_shrinker = { >> }; >> >> #ifdef CONFIG_DEBUG_FS >> -static int split_huge_pages_set(void *data, u64 val) >> +static void split_huge_pages_all(void) >> { >> struct zone *zone; >> struct page *page; >> unsigned long pfn, max_zone_pfn; >> unsigned long total = 0, split = 0; >> >> - if (val != 1) >> - return -EINVAL; >> - >> + pr_info("Split all THPs\n"); >> for_each_populated_zone(zone) { >> max_zone_pfn = zone_end_pfn(zone); >> for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) { >> @@ -2959,11 +2958,141 @@ static int split_huge_pages_set(void *data, u64 val) >> } >> >> pr_info("%lu of %lu THP split\n", split, total); >> +} >> >> - return 0; >> +static int split_huge_pages_pid(int pid, unsigned long vaddr_start, >> + unsigned long vaddr_end) >> +{ >> + int ret = 0; >> + struct task_struct *task; >> + struct mm_struct *mm; >> + unsigned long total = 0, split = 0; >> + unsigned long addr; >> + >> + vaddr_start &= PAGE_MASK; >> + vaddr_end &= PAGE_MASK; >> + >> + /* Find the task_struct from pid */ >> + rcu_read_lock(); >> + task = find_task_by_vpid(pid); >> + if (!task) { >> + rcu_read_unlock(); >> + ret = -ESRCH; >> + goto out; >> + } >> + get_task_struct(task); >> + rcu_read_unlock(); >> + >> + /* Find the mm_struct */ >> + mm = get_task_mm(task); >> + put_task_struct(task); >> + >> + if (!mm) { >> + ret = -EINVAL; >> + goto out; >> + } >> + >> + pr_info("Split huge pages in pid: %d, vaddr: [0x%lx - 0x%lx]\n", >> + pid, vaddr_start, vaddr_end); >> + >> + mmap_read_lock(mm); >> + /* >> + * always increase addr by PAGE_SIZE, since we could have a PTE page >> + * table filled with PTE-mapped THPs, each of which is distinct. >> + */ >> + for (addr = vaddr_start; addr < vaddr_end; addr += PAGE_SIZE) { >> + struct vm_area_struct *vma = find_vma(mm, addr); >> + unsigned int follflags; >> + struct page *page; >> + >> + if (!vma || addr < vma->vm_start) >> + break; >> + >> + /* skip special VMA and hugetlb VMA */ >> + if (vma_is_special_huge(vma) || is_vm_hugetlb_page(vma)) { > > VM_IO vma should be skipped as well. And you may extract this into a helper? Sure. Any name suggestion? :) >> + addr = vma->vm_end; >> + continue; >> + } >> + >> + /* FOLL_DUMP to ignore special (like zero) pages */ >> + follflags = FOLL_GET | FOLL_DUMP; >> + page = follow_page(vma, addr, follflags); >> + >> + if (IS_ERR(page)) >> + continue; >> + if (!page) >> + continue; >> + >> + if (!is_transparent_hugepage(page)) >> + goto next; >> + >> + total++; >> + if (!can_split_huge_page(compound_head(page), NULL)) >> + goto next; >> + >> + if (!trylock_page(page)) >> + goto next; >> + >> + if (!split_huge_page(page)) >> + split++; >> + >> + unlock_page(page); >> +next: >> + put_page(page); >> + } >> + mmap_read_unlock(mm); >> + mmput(mm); >> + >> + pr_info("%lu of %lu THP split\n", split, total); >> + >> +out: >> + return ret; >> } >> -DEFINE_DEBUGFS_ATTRIBUTE(split_huge_pages_fops, NULL, split_huge_pages_set, >> - "%llu\n"); >> + >> +static ssize_t split_huge_pages_write(struct file *file, const char __user *buf, >> + size_t count, loff_t *ppops) >> +{ >> + static DEFINE_MUTEX(split_debug_mutex); >> + ssize_t ret; >> + char input_buf[80]; /* hold pid, start_vaddr, end_vaddr */ > > Why not move buf len macro in the following patch to this patch? Then > you don't have to change the length again. Sure. Thanks for the comments. -- Best Regards, Yan Zi --=_MailMate_2CBEA0E7-C676-40B1-8BAE-0E87836D1426_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEEh7yFAW3gwjwQ4C9anbJR82th+ooFAmBX9tkPHHppeUBudmlk aWEuY29tAAoJEJ2yUfNrYfqK5iYP+gKC+HcHQ95kBHvZJcBXN2woUPi74EoithCh KNTiK8deBB5bgLI2GIhxPn6VACPi5S8lUCnfwQJhQOZ9G/YwTC2fjkL7Dsc/QtOb mzrr6pvDkGQruEsenXePKZ/IioCkFYwhJ5DHsoj5S3B5ckxI7HoS8pamKg7XsUjC 3FQ9hQuqzCXbIb4GX0qn3CHbdSLvhBH+jxODNurjcNwudSHH6SuuYdiBee3lmOqB 0iOzVOVwu2IUloj+5QQat/BI6RLRIQwYB3LyfDO9wNwiZ1sr/WEDuudfPuRKtWr7 yCdy4DdYrbp9m5+vtGhA3mf+4g+lwFskhzDbtec0iFfqRZEvBqo8CmCpKjcFVA7r 31PW2Oi3ZNu5rw/oqb5NvDuXoHKXCwF/NmbfiGyBcPGfkCRGLnVDz1IBT/JKkp49 5moRD6M/698IQVML3WrFeTHOdGaQ7g98LOQhO5KOmodo1Wh1MHvlgEHn0zSfpB8t 8UqnW2ttrCHM224hmjhdNxQJi32mWzKYzhTUI+y6J3vox1s5p6WHN1FoQPiIbVpG G6nOxyL4NNV+XdimCrlUXouFc7itvw/s90BIR0klMEvexDUgXd7ii5FWgjVZWjy6 JtnGvrGa6xGBIq+KyOgOH6iaJVt6x/hD8V8ejWaK2CYK9y6x8T3H4ldbnixNHBVD K7RdTFku =ZuEt -----END PGP SIGNATURE----- --=_MailMate_2CBEA0E7-C676-40B1-8BAE-0E87836D1426_=--