From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-3944463-1519939007-2-11673246854732370803 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 unknown, 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=1519939006; b=MaY5hzBctSbyNdyQRQ4PN62WOx2h4W6bOEHPB+g/gVd/Mjx G+VOMRg8SRgF7S587wlpCC2yqez5eC/rs4HK6wdRktLE5HbCXfCMgIfceRABqPE6 xxUPzxRtWLPmYM01UOYqDE3mUBltkRWf3UnmYJPHRVznxD7iec2sd424KUWp/doC 3d/O6BL5+dBw3NBwiSO42uS0Ib7VoNpNVqnu1v4ukmxUdOIDR8dJ1NN1JgMRTnrW LsFPFGAoB7rWmhy/eqZFPR9oyaSr7J7wVef9KwROipScw/uccz6R85K9we9qe6tN YOZ3z0ugVqT1IC3VV/ZQQ8TOYwwyCoeO2GTWVzQ== 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=1519939006; bh=G5v2JpPvaPIXZl675mzsoXFe3MAXuhfa7DcjDHWL/dI=; b=IIj28dXl6rKo Zv2ceYTulKRCTI67+FjoLiIhg5Gom0MYrEVw8GRY8LTjYe4mRziIYxhRlbEMPbiE nL0XYruYaS+65g2qMKRQU/Z+eGP/Gf6ipEoYZb1SmvmdA8nG6jZmy39H5ZqtPlpr HiC0wrMYA7H2ad/GN0iRHkBIUio+OvtH3ZYmOs4KqCkFAjTnlQGDVqwNEFIWiyXD r1t52O+vvjdyENEMSPd68mY/87di6MnoysmyaJmJ/uHeGWQ/AH214EZpeon942Nr yWKJksPTDqbjgIDB0AWErrm8jSBYveoIgAK3WHrsXPYBHd4wJPoedyY9BL2Iy16Q /Cv+9hD+PQ== ARC-Authentication-Results: i=1; mx6.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=jL3Z22F2 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: mx6.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=jL3Z22F2 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 S1161848AbeCAVQB (ORCPT ); Thu, 1 Mar 2018 16:16:01 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:49254 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1034173AbeCAVPc (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 3/4] mm: Mark pages allocated through vmalloc Date: Thu, 1 Mar 2018 13:15:22 -0800 Message-Id: <20180301211523.21104-4-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 Use a bit in page_type to mark pages which have been allocated through vmalloc. 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 --- fs/proc/page.c | 2 ++ include/linux/page-flags.h | 6 ++++++ include/uapi/linux/kernel-page-flags.h | 2 +- mm/vmalloc.c | 2 ++ tools/vm/page-types.c | 1 + 5 files changed, 12 insertions(+), 1 deletion(-) diff --git a/fs/proc/page.c b/fs/proc/page.c index 1491918a33c3..c9757af919a3 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -154,6 +154,8 @@ u64 stable_page_flags(struct page *page) if (PageBalloon(page)) u |= 1 << KPF_BALLOON; + if (PageVmalloc(page)) + u |= 1 << KPF_VMALLOC; if (page_is_idle(page)) u |= 1 << KPF_IDLE; diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index d151f590bbc6..8142ab716e90 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -643,6 +643,7 @@ PAGEFLAG_FALSE(DoubleMap) #define PG_buddy 0x00000080 #define PG_balloon 0x00000100 #define PG_kmemcg 0x00000200 +#define PG_vmalloc 0x00000400 #define PageType(page, flag) \ ((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE) @@ -681,6 +682,11 @@ PAGE_TYPE_OPS(Balloon, balloon) */ PAGE_TYPE_OPS(Kmemcg, kmemcg) +/* + * Pages allocated through vmalloc are tagged with this bit. + */ +PAGE_TYPE_OPS(Vmalloc, vmalloc) + 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 fa139841ec18..5f1735ff05b3 100644 --- a/include/uapi/linux/kernel-page-flags.h +++ b/include/uapi/linux/kernel-page-flags.h @@ -35,6 +35,6 @@ #define KPF_BALLOON 23 #define KPF_ZERO_PAGE 24 #define KPF_IDLE 25 - +#define KPF_VMALLOC 26 #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */ diff --git a/mm/vmalloc.c b/mm/vmalloc.c index ebff729cc956..3bc0538fc21b 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1536,6 +1536,7 @@ static void __vunmap(const void *addr, int deallocate_pages) struct page *page = area->pages[i]; BUG_ON(!page); + __ClearPageVmalloc(page); __free_pages(page, 0); } @@ -1705,6 +1706,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask, area->nr_pages = i; goto fail; } + __SetPageVmalloc(page); area->pages[i] = page; if (gfpflags_allow_blocking(gfp_mask|highmem_mask)) cond_resched(); diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c index a8783f48f77f..116f59eff5e2 100644 --- a/tools/vm/page-types.c +++ b/tools/vm/page-types.c @@ -131,6 +131,7 @@ static const char * const page_flag_names[] = { [KPF_KSM] = "x:ksm", [KPF_THP] = "t:thp", [KPF_BALLOON] = "o:balloon", + [KPF_VMALLOC] = "V:vmalloc", [KPF_ZERO_PAGE] = "z:zero_page", [KPF_IDLE] = "i:idle_page", -- 2.16.1