From nobody Fri Dec 19 20:52:36 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BDFA72973BE for ; Mon, 28 Apr 2025 18:29:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745864996; cv=none; b=V7AYFsgLVRoSeyFZ+K2ilkrTeQjyxg7q0XlcIuDSFic/xQMKT/tsYctPmwjAafPSZXNEouPTvopvoyHFxfvZdjwvt9dgtel7EcRnmf81t+Ua/J9hF8YEhYHF1ana04TQDgKQkyDWEHx5otHK0rykLf0O0wRmfIATlRtrSV2NI4k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745864996; c=relaxed/simple; bh=qJjvFraYMbS3NawL5bEoBDnu1Y2hhnhcD07ng1OK+Vs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=h+6hYh7PatYNXgkvVj8a2SKHk3H0t4UX34VqKrDCICjnKH28vd2klhvOoehx6zIHI20/Omqjj4rnzs+f7rF7CK0CVwIBBPOcvzEZkJVmyKTN/AXmujpZMCKOZXkHAHnQtnxLKSztHuydeDp+Fjjn/EeGow+CbYKvb3T8KTsIPxM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Lruv6Ynr; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Lruv6Ynr" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1745864993; 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=0PRSRSjriKhEwGd96T6Hhqr7Fe31F3qpR+JiRPVIrvc=; b=Lruv6YnrzmXqBQBKQ0mHTWs5QZIETPg0JdjhKcWyCG4GswC2FmTA0M5tifWkbnOHeeFExh 4gwmrQFa6VKFJ5sRwQnTIuC4d+w9N6MKsstatwnH7M2Dh5sVXqL4jfxsBRM1AlCZSnlRtz avBrBP9bWVN4MiTi3NN1BA4MvC3P3IU= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-594-SER52d8_PymPoy6i7c89KQ-1; Mon, 28 Apr 2025 14:29:50 -0400 X-MC-Unique: SER52d8_PymPoy6i7c89KQ-1 X-Mimecast-MFC-AGG-ID: SER52d8_PymPoy6i7c89KQ_1745864985 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 653581956086; Mon, 28 Apr 2025 18:29:45 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.65.12]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 2AE9830002C3; Mon, 28 Apr 2025 18:29:38 +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: akpm@linux-foundation.org, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, david@redhat.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, ryan.roberts@arm.com, willy@infradead.org, peterx@redhat.com, shuah@kernel.org, ziy@nvidia.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, dev.jain@arm.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org Subject: [PATCH v5 3/4] khugepaged: add defer option to mTHP options Date: Mon, 28 Apr 2025 12:29:03 -0600 Message-ID: <20250428182904.93989-4-npache@redhat.com> In-Reply-To: <20250428182904.93989-1-npache@redhat.com> References: <20250428182904.93989-1-npache@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" Now that we have defer to globally disable THPs at fault time, lets add a defer setting to the mTHP options. This will allow khugepaged to operate at that order, while avoiding it at PF time. Signed-off-by: Nico Pache --- include/linux/huge_mm.h | 5 +++++ mm/huge_memory.c | 38 +++++++++++++++++++++++++++++++++----- mm/khugepaged.c | 8 ++++---- 3 files changed, 42 insertions(+), 9 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 57e6c962afb1..a877c59bea67 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -96,6 +96,7 @@ extern struct kobj_attribute thpsize_shmem_enabled_attr; #define TVA_SMAPS (1 << 0) /* Will be used for procfs */ #define TVA_IN_PF (1 << 1) /* Page fault handler */ #define TVA_ENFORCE_SYSFS (1 << 2) /* Obey sysfs configuration */ +#define TVA_IN_KHUGEPAGE ((1 << 2) | (1 << 3)) /* Khugepaged defer support= */ =20 #define thp_vma_allowable_order(vma, vm_flags, tva_flags, order) \ (!!thp_vma_allowable_orders(vma, vm_flags, tva_flags, BIT(order))) @@ -182,6 +183,7 @@ extern unsigned long transparent_hugepage_flags; extern unsigned long huge_anon_orders_always; extern unsigned long huge_anon_orders_madvise; extern unsigned long huge_anon_orders_inherit; +extern unsigned long huge_anon_orders_defer; =20 static inline bool hugepage_global_enabled(void) { @@ -306,6 +308,9 @@ unsigned long thp_vma_allowable_orders(struct vm_area_s= truct *vma, /* Optimization to check if required orders are enabled early. */ if ((tva_flags & TVA_ENFORCE_SYSFS) && vma_is_anonymous(vma)) { unsigned long mask =3D READ_ONCE(huge_anon_orders_always); + + if ((tva_flags & TVA_IN_KHUGEPAGE) =3D=3D TVA_IN_KHUGEPAGE) + mask |=3D READ_ONCE(huge_anon_orders_defer); if (vm_flags & VM_HUGEPAGE) mask |=3D READ_ONCE(huge_anon_orders_madvise); if (hugepage_global_always() || hugepage_global_defer() || diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 17b66adef029..705467ea9265 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -81,6 +81,7 @@ unsigned long huge_zero_pfn __read_mostly =3D ~0UL; unsigned long huge_anon_orders_always __read_mostly; unsigned long huge_anon_orders_madvise __read_mostly; unsigned long huge_anon_orders_inherit __read_mostly; +unsigned long huge_anon_orders_defer __read_mostly; static bool anon_orders_configured __initdata; =20 static inline bool file_thp_enabled(struct vm_area_struct *vma) @@ -505,13 +506,15 @@ static ssize_t anon_enabled_show(struct kobject *kobj, const char *output; =20 if (test_bit(order, &huge_anon_orders_always)) - output =3D "[always] inherit madvise never"; + output =3D "[always] inherit madvise defer never"; else if (test_bit(order, &huge_anon_orders_inherit)) - output =3D "always [inherit] madvise never"; + output =3D "always [inherit] madvise defer never"; else if (test_bit(order, &huge_anon_orders_madvise)) - output =3D "always inherit [madvise] never"; + output =3D "always inherit [madvise] defer never"; + else if (test_bit(order, &huge_anon_orders_defer)) + output =3D "always inherit madvise [defer] never"; else - output =3D "always inherit madvise [never]"; + output =3D "always inherit madvise defer [never]"; =20 return sysfs_emit(buf, "%s\n", output); } @@ -527,25 +530,36 @@ static ssize_t anon_enabled_store(struct kobject *kob= j, spin_lock(&huge_anon_orders_lock); clear_bit(order, &huge_anon_orders_inherit); clear_bit(order, &huge_anon_orders_madvise); + clear_bit(order, &huge_anon_orders_defer); set_bit(order, &huge_anon_orders_always); spin_unlock(&huge_anon_orders_lock); } else if (sysfs_streq(buf, "inherit")) { spin_lock(&huge_anon_orders_lock); clear_bit(order, &huge_anon_orders_always); clear_bit(order, &huge_anon_orders_madvise); + clear_bit(order, &huge_anon_orders_defer); set_bit(order, &huge_anon_orders_inherit); spin_unlock(&huge_anon_orders_lock); } else if (sysfs_streq(buf, "madvise")) { spin_lock(&huge_anon_orders_lock); clear_bit(order, &huge_anon_orders_always); clear_bit(order, &huge_anon_orders_inherit); + clear_bit(order, &huge_anon_orders_defer); set_bit(order, &huge_anon_orders_madvise); spin_unlock(&huge_anon_orders_lock); + } else if (sysfs_streq(buf, "defer")) { + spin_lock(&huge_anon_orders_lock); + clear_bit(order, &huge_anon_orders_always); + clear_bit(order, &huge_anon_orders_inherit); + clear_bit(order, &huge_anon_orders_madvise); + set_bit(order, &huge_anon_orders_defer); + spin_unlock(&huge_anon_orders_lock); } else if (sysfs_streq(buf, "never")) { spin_lock(&huge_anon_orders_lock); clear_bit(order, &huge_anon_orders_always); clear_bit(order, &huge_anon_orders_inherit); clear_bit(order, &huge_anon_orders_madvise); + clear_bit(order, &huge_anon_orders_defer); spin_unlock(&huge_anon_orders_lock); } else ret =3D -EINVAL; @@ -1002,7 +1016,7 @@ static char str_dup[PAGE_SIZE] __initdata; static int __init setup_thp_anon(char *str) { char *token, *range, *policy, *subtoken; - unsigned long always, inherit, madvise; + unsigned long always, inherit, madvise, defer; char *start_size, *end_size; int start, end, nr; char *p; @@ -1014,6 +1028,8 @@ static int __init setup_thp_anon(char *str) always =3D huge_anon_orders_always; madvise =3D huge_anon_orders_madvise; inherit =3D huge_anon_orders_inherit; + defer =3D huge_anon_orders_defer; + p =3D str_dup; while ((token =3D strsep(&p, ";")) !=3D NULL) { range =3D strsep(&token, ":"); @@ -1053,18 +1069,28 @@ static int __init setup_thp_anon(char *str) bitmap_set(&always, start, nr); bitmap_clear(&inherit, start, nr); bitmap_clear(&madvise, start, nr); + bitmap_clear(&defer, start, nr); } else if (!strcmp(policy, "madvise")) { bitmap_set(&madvise, start, nr); bitmap_clear(&inherit, start, nr); bitmap_clear(&always, start, nr); + bitmap_clear(&defer, start, nr); } else if (!strcmp(policy, "inherit")) { bitmap_set(&inherit, start, nr); bitmap_clear(&madvise, start, nr); bitmap_clear(&always, start, nr); + bitmap_clear(&defer, start, nr); + } else if (!strcmp(policy, "defer")) { + bitmap_set(&defer, start, nr); + bitmap_clear(&madvise, start, nr); + bitmap_clear(&always, start, nr); + bitmap_clear(&inherit, start, nr); } else if (!strcmp(policy, "never")) { bitmap_clear(&inherit, start, nr); bitmap_clear(&madvise, start, nr); bitmap_clear(&always, start, nr); + bitmap_clear(&defer, start, nr); + } else { pr_err("invalid policy %s in thp_anon boot parameter\n", policy); goto err; @@ -1075,6 +1101,8 @@ static int __init setup_thp_anon(char *str) huge_anon_orders_always =3D always; huge_anon_orders_madvise =3D madvise; huge_anon_orders_inherit =3D inherit; + huge_anon_orders_defer =3D defer; + anon_orders_configured =3D true; return 1; =20 diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 812181354c46..738870331aed 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -491,7 +491,7 @@ void khugepaged_enter_vma(struct vm_area_struct *vma, { if (!test_bit(MMF_VM_HUGEPAGE, &vma->vm_mm->flags) && hugepage_pmd_enabled()) { - if (thp_vma_allowable_order(vma, vm_flags, TVA_ENFORCE_SYSFS, + if (thp_vma_allowable_order(vma, vm_flags, TVA_IN_KHUGEPAGE, PMD_ORDER)) __khugepaged_enter(vma->vm_mm); } @@ -955,7 +955,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm= , unsigned long address, struct collapse_control *cc, int order) { struct vm_area_struct *vma; - unsigned long tva_flags =3D cc->is_khugepaged ? TVA_ENFORCE_SYSFS : 0; + unsigned long tva_flags =3D cc->is_khugepaged ? TVA_IN_KHUGEPAGE : 0; =20 if (unlikely(khugepaged_test_exit_or_disable(mm))) return SCAN_ANY_PROCESS; @@ -1429,7 +1429,7 @@ static int khugepaged_scan_pmd(struct mm_struct *mm, bool writable =3D false; int chunk_none_count =3D 0; int scaled_none =3D khugepaged_max_ptes_none >> (HPAGE_PMD_ORDER - KHUGEP= AGED_MIN_MTHP_ORDER); - unsigned long tva_flags =3D cc->is_khugepaged ? TVA_ENFORCE_SYSFS : 0; + unsigned long tva_flags =3D cc->is_khugepaged ? TVA_IN_KHUGEPAGE : 0; VM_BUG_ON(address & ~HPAGE_PMD_MASK); =20 result =3D find_pmd_or_thp_or_none(mm, address, &pmd); @@ -2632,7 +2632,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned = int pages, int *result, break; } if (!thp_vma_allowable_order(vma, vma->vm_flags, - TVA_ENFORCE_SYSFS, PMD_ORDER)) { + TVA_IN_KHUGEPAGE, PMD_ORDER)) { skip: progress++; continue; --=20 2.48.1