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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F46DC3ABC9 for ; Thu, 15 May 2025 03:39:52 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 40F816B00C3; Wed, 14 May 2025 23:39:51 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3BD426B010A; Wed, 14 May 2025 23:39:51 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 237F96B010B; Wed, 14 May 2025 23:39:51 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 013B06B00C3 for ; Wed, 14 May 2025 23:39:50 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 182DB16146A for ; Thu, 15 May 2025 03:39:51 +0000 (UTC) X-FDA: 83443738182.21.AD3D1C0 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf09.hostedemail.com (Postfix) with ESMTP id 5128D140006 for ; Thu, 15 May 2025 03:39:49 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=eNtCmACQ; spf=pass (imf09.hostedemail.com: domain of npache@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=npache@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1747280389; a=rsa-sha256; cv=none; b=T5qHOTtAMZumB+OiTB4lKRMevJOt/P45jArLSH5ULyZsxLa6w6Q1fdSSVUJ/QngICEHVen jUcHv1HHYgztGWj/QlA25B3hxIKH/4bA08AZlSxea7xieHL5t8S3FfBOegnz/2B04O3mty exZ6SkrrjMbm4dNq9L9JfdjL1kJxPaU= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=eNtCmACQ; spf=pass (imf09.hostedemail.com: domain of npache@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=npache@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1747280389; 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:dkim-signature; bh=BQb3Gd4y9CLA3GzXKNCccBYdyfEwUNAPaSPoLscp5Es=; b=qibOUvAP4z/5RFqBcj1FPzVdfREZkehV6UzDEp2j+S5UEkiJcPQsl5a40z03M7c/+qlYQn 1lnhcng/RWWYzTKAJUNeXxtA5bCwsBvnW3owQ9FXwA8TJe6I8QxA6ZWzRL4i2NGKcZU/Gc ACoRsgO3vgQuLKtkVUIPbCU0jAelc5I= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1747280388; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BQb3Gd4y9CLA3GzXKNCccBYdyfEwUNAPaSPoLscp5Es=; b=eNtCmACQHTZ/1DugQPMJFT4CeKjXHzEQw53UZrdi411mDbG0ktr/lfI/vhw1/D03L/MT8/ ZhayRaqnlFJOsaOHC9TtsCKeNsrQKXbII5gzl1Y16yzgjulGs6U5ePrY6jfDzUzj/9iysW MQ1lOpzMUbwXfQ+J2JodpygAzYDWDfs= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-12-n3UWDWEqPxSdmjHv7ZPF_A-1; Wed, 14 May 2025 23:39:43 -0400 X-MC-Unique: n3UWDWEqPxSdmjHv7ZPF_A-1 X-Mimecast-MFC-AGG-ID: n3UWDWEqPxSdmjHv7ZPF_A_1747280379 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 6AD921800256; Thu, 15 May 2025 03:39:38 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.88.116]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 99DCF1953B85; Thu, 15 May 2025 03:39:22 +0000 (UTC) From: Nico Pache To: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: rientjes@google.com, hannes@cmpxchg.org, lorenzo.stoakes@oracle.com, rdunlap@infradead.org, mhocko@suse.com, Liam.Howlett@oracle.com, zokeefe@google.com, surenb@google.com, jglisse@google.com, cl@gentwo.org, jack@suse.cz, dave.hansen@linux.intel.com, will@kernel.org, tiwai@suse.de, catalin.marinas@arm.com, anshuman.khandual@arm.com, dev.jain@arm.com, raquini@redhat.com, aarcange@redhat.com, kirill.shutemov@linux.intel.com, yang@os.amperecomputing.com, thomas.hellstrom@linux.intel.com, vishal.moola@gmail.com, sunnanyong@huawei.com, usamaarif642@gmail.com, wangkefeng.wang@huawei.com, ziy@nvidia.com, shuah@kernel.org, peterx@redhat.com, willy@infradead.org, ryan.roberts@arm.com, baolin.wang@linux.alibaba.com, baohua@kernel.org, david@redhat.com, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, rostedt@goodmis.org, corbet@lwn.net, akpm@linux-foundation.org, npache@redhat.com Subject: [PATCH v6 1/4] mm: defer THP insertion to khugepaged Date: Wed, 14 May 2025 21:38:54 -0600 Message-ID: <20250515033857.132535-2-npache@redhat.com> In-Reply-To: <20250515033857.132535-1-npache@redhat.com> References: <20250515033857.132535-1-npache@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5128D140006 X-Stat-Signature: b18dqgup4bix76xqsh7ahicano59oidb X-HE-Tag: 1747280389-266720 X-HE-Meta: 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 bIGz3Osa 5bJ1G1EoSzpBwbdSg9rMskJRifla/CjXIt3FWZvINd7kkfCXaEX1qI6j1cLm1a+6pRxkZLqyxVEima6LGwy+d6topS/6fn53RSOMVlakFeGPHg52geT5qPRuaWJBOYJRRVcjfjG/5xyLw2p5DXi0EaiDZSW8alKM1er0TfEZv09EiLpa8BPVSqY6zkFLn+EdGvBvXF1qEDGifMmNCUewP0QV7TfMLZnHqAHlYWpGrTaEUaBKGRxmsUQbmB5RQ0RKt+qrnY7FCMsdqAdEKYAIF38W9yTMWFT9qyILDFhqLX/ADqHIeFxPITqyB7/stnnmUpBaeLrhznNja0h6eTzh9dX6rnedk1Wjo8orYSQHTcRjExWvWyKM0NsYI7f8zro4EaqsaSG7uPZ6BFZrtkT3VhT3IgPxtlVElMp7NH5n5dfv9LLw= 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: setting /transparent_hugepages/enabled=always allows applications to benefit from THPs without having to madvise. However, the page fault handler takes very few considerations to decide weather or not to actually use a THP. This can lead to a lot of wasted memory. khugepaged only operates on memory that was either allocated with enabled=always or MADV_HUGEPAGE. Introduce the ability to set enabled=defer, which will prevent THPs from being allocated by the page fault handler unless madvise is set, leaving it up to khugepaged to decide which allocations will collapse to a THP. This should allow applications to benefits from THPs, while curbing some of the memory waste. Acked-by: Zi Yan Co-developed-by: Rafael Aquini Signed-off-by: Rafael Aquini Signed-off-by: Nico Pache --- include/linux/huge_mm.h | 15 +++++++++++++-- mm/huge_memory.c | 31 +++++++++++++++++++++++++++---- 2 files changed, 40 insertions(+), 6 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index e3d15c737008..02038e3db829 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -48,6 +48,7 @@ enum transparent_hugepage_flag { TRANSPARENT_HUGEPAGE_UNSUPPORTED, TRANSPARENT_HUGEPAGE_FLAG, TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG, + TRANSPARENT_HUGEPAGE_DEFER_PF_FLAG, TRANSPARENT_HUGEPAGE_DEFRAG_DIRECT_FLAG, TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_FLAG, TRANSPARENT_HUGEPAGE_DEFRAG_KSWAPD_OR_MADV_FLAG, @@ -186,6 +187,7 @@ static inline bool hugepage_global_enabled(void) { return transparent_hugepage_flags & ((1<