From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3944332-1519939009-2-14006941395366720844 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.249, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES roda, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='CN', FromHeader='org', MailFrom='org' X-Spam-charsets: X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: linux-api-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1519939008; b=tyajRNzEeBXyCTO6MtfWFdXmbNwi7aYbb3R0dRsfHt/YliO uCNw0fathAQhxL/5gKWvGsbM0dj7JipDK6VQZbLy+6pSQ9hnGuOaMTKMCVqLpGRj KY0z6VeN5otPRVT2hnhe0oet7Ud+g2Lm++L/3xNvLAfIAlbejV3483sUd5oqllFF /0QV5b8GDl8Pad+6N/j3iV7rhcjHUTOn4K0gyF8ho+s6s469vAeHOXvpMflFD8I4 7JtX19IUe0JMwwWWHfuUYISJnTjwSHOvA4dJZPCphMO9GnSWVIhfmZpq2Tt8ClVO 1w84OxucEuHpcWCHAALIEEo7+2+1+pqXrbkD0fw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:sender:list-id; s=arctest; t=1519939008; bh=2B9FRD4XE4b3rl+7lH1n/EjniD9QiMB3ys6iLYXxbKs=; b=Hs6gU/hTRmUv 96XG28Hw3GDQfhFjtsRyKeScGe+U9+c2w786MH6T7Y6xpRDQHhTcDuR/v2YXKxjG yQREHvvC7U31cdqzKefB7qmLwG+g2+2yL6pxPSOt9YYxn1GNSu1PpGnnmpqpmNup csZ/gq03iFTv9Avm6I+GeMKStLuJ5/TIKBDZ7S0AjzWcNjDG0Sgw8PEEFE3yAaFT kuED7WKBdZucrLyZ9huFEz6AJkrSHiMBU37EIC4naF/07UXYE5w0h+cdwQq1ONAH +sebq7FRHTEt9a3cULqY14+gvn0zFxDt/YeFCLbKHG/JBbqpCXNS4iZB4dQ+RhDw 1UFoe3Xm/w== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered; 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=ELak+XJS x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=infradead.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=infradead.org header.result=pass header_is_org_domain=yes Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=fail (message has been altered; 2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=ELak+XJS x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=bombadil.20170209; dmarc=none (p=none,has-list-id=yes,d=none) header.from=infradead.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=linux-api-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=infradead.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161272AbeCAVQA (ORCPT ); Thu, 1 Mar 2018 16:16:00 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:49274 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1034175AbeCAVPc (ORCPT ); Thu, 1 Mar 2018 16:15:32 -0500 From: Matthew Wilcox To: linux-mm@kvack.org Cc: Matthew Wilcox , Martin Schwidefsky , linux-kernel@vger.kernel.org, Fengguang Wu , linux-api@vger.kernel.org Subject: [PATCH v4 4/4] mm: Mark pages in use for page tables Date: Thu, 1 Mar 2018 13:15:23 -0800 Message-Id: <20180301211523.21104-5-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180301211523.21104-1-willy@infradead.org> References: <20180301211523.21104-1-willy@infradead.org> Sender: linux-api-owner@vger.kernel.org X-Mailing-List: linux-api@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Matthew Wilcox Define a new PageTable bit in the page_type and use it to mark pages in use as page tables. This can be helpful when debugging crashdumps or analysing memory fragmentation. Add a KPF flag to report these pages to userspace and update page-types.c to interpret that flag. Signed-off-by: Matthew Wilcox --- arch/tile/mm/pgtable.c | 3 +++ fs/proc/page.c | 2 ++ include/linux/mm.h | 2 ++ include/linux/page-flags.h | 6 ++++++ include/uapi/linux/kernel-page-flags.h | 1 + tools/vm/page-types.c | 1 + 6 files changed, 15 insertions(+) diff --git a/arch/tile/mm/pgtable.c b/arch/tile/mm/pgtable.c index ec5576fd3a86..6dff12db335d 100644 --- a/arch/tile/mm/pgtable.c +++ b/arch/tile/mm/pgtable.c @@ -206,6 +206,7 @@ struct page *pgtable_alloc_one(struct mm_struct *mm, unsigned long address, */ for (i = 1; i < order; ++i) { init_page_count(p+i); + __SetPageTable(p+i); inc_zone_page_state(p+i, NR_PAGETABLE); } @@ -226,6 +227,7 @@ void pgtable_free(struct mm_struct *mm, struct page *p, int order) for (i = 1; i < order; ++i) { __free_page(p+i); + __ClearPageTable(p+i); dec_zone_page_state(p+i, NR_PAGETABLE); } } @@ -240,6 +242,7 @@ void __pgtable_free_tlb(struct mmu_gather *tlb, struct page *pte, for (i = 1; i < order; ++i) { tlb_remove_page(tlb, pte + i); + __ClearPageTable(pte + i); dec_zone_page_state(pte + i, NR_PAGETABLE); } } diff --git a/fs/proc/page.c b/fs/proc/page.c index c9757af919a3..80275e7a963b 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -156,6 +156,8 @@ u64 stable_page_flags(struct page *page) u |= 1 << KPF_BALLOON; if (PageVmalloc(page)) u |= 1 << KPF_VMALLOC; + if (PageTable(page)) + u |= 1 << KPF_PGTABLE; if (page_is_idle(page)) u |= 1 << KPF_IDLE; diff --git a/include/linux/mm.h b/include/linux/mm.h index ad06d42adb1a..7a15042d6828 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1829,6 +1829,7 @@ static inline bool pgtable_page_ctor(struct page *page) { if (!ptlock_init(page)) return false; + __SetPageTable(page); inc_zone_page_state(page, NR_PAGETABLE); return true; } @@ -1836,6 +1837,7 @@ static inline bool pgtable_page_ctor(struct page *page) static inline void pgtable_page_dtor(struct page *page) { pte_lock_deinit(page); + __ClearPageTable(page); dec_zone_page_state(page, NR_PAGETABLE); } diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 8142ab716e90..ac6bab90849c 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -644,6 +644,7 @@ PAGEFLAG_FALSE(DoubleMap) #define PG_balloon 0x00000100 #define PG_kmemcg 0x00000200 #define PG_vmalloc 0x00000400 +#define PG_table 0x00000800 #define PageType(page, flag) \ ((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE) @@ -687,6 +688,11 @@ PAGE_TYPE_OPS(Kmemcg, kmemcg) */ PAGE_TYPE_OPS(Vmalloc, vmalloc) +/* + * Marks pages in use as page tables. + */ +PAGE_TYPE_OPS(Table, table) + extern bool is_free_buddy_page(struct page *page); __PAGEFLAG(Isolated, isolated, PF_ANY); diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h index 5f1735ff05b3..3c51d8bf8b7b 100644 --- a/include/uapi/linux/kernel-page-flags.h +++ b/include/uapi/linux/kernel-page-flags.h @@ -36,5 +36,6 @@ #define KPF_ZERO_PAGE 24 #define KPF_IDLE 25 #define KPF_VMALLOC 26 +#define KPF_PGTABLE 27 #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */ diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c index 116f59eff5e2..bbb992694f05 100644 --- a/tools/vm/page-types.c +++ b/tools/vm/page-types.c @@ -132,6 +132,7 @@ static const char * const page_flag_names[] = { [KPF_THP] = "t:thp", [KPF_BALLOON] = "o:balloon", [KPF_VMALLOC] = "V:vmalloc", + [KPF_PGTABLE] = "g:pgtable", [KPF_ZERO_PAGE] = "z:zero_page", [KPF_IDLE] = "i:idle_page", -- 2.16.1