From nobody Thu Dec 18 05:33:54 2025 Received: from out30-124.freemail.mail.aliyun.com (out30-124.freemail.mail.aliyun.com [115.124.30.124]) (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 ABDA6142E76 for ; Mon, 6 May 2024 08:46:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714985222; cv=none; b=nykNTFPV1JeMHoReMEREgj825KupzVfrsRZ+sD85qmRk3iLrEDhtslgSizZDXM/V8AxnSmH/UUlEvd3CTR5SvdYWB61HnkGhbobFHCm5z6DKUiW6pt88BGg0i7HBvt1XXsRlJBSzkBKuRS6wVX12FFPLYKmX/+R6W0WqceZlvVs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714985222; c=relaxed/simple; bh=onYO+hDGg55XvRs/b0q2a0g+jYhwpA694tA8GodAcmk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iKf/JYSQQxyGhY80F//6wCTFQEB+iCyWzTya5lYCE5WxC5cvazcQ+zfIncldTiJGGmKVVpEsY7tzKt35V8Fx4kVhJ4JvZHPRp/rgys/uXTBizlfyVASX4nhhNgBmzY+0Y7T9C8Rsjp6GP99f4uegGxrz8nDE53gwvEQLDvRlFDI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=U+fSD8Bx; arc=none smtp.client-ip=115.124.30.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="U+fSD8Bx" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1714985212; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=vbAZ9jfAMkqVV3Kg32TDOediCKK1trUe5zVBa6e0pWM=; b=U+fSD8Bx3p1i0NvaIXfxpMc20W6bOs3m8DHQ4Lt3uCGviA9zVsWrjrzY0ti5A4Gh5RfNCaLl5rMZ9R/FVrKUQQlH6ybd06wS6jvQzKcUJ9sFY8ysvPSSza40gYjJv3noUJ7U7hSMd8cVDEbBpSUrlLGzDfBhAEtjTBnO/xEOXBY= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R181e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045046011;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=14;SR=0;TI=SMTPD_---0W5w3v7S_1714985209; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0W5w3v7S_1714985209) by smtp.aliyun-inc.com; Mon, 06 May 2024 16:46:50 +0800 From: Baolin Wang To: akpm@linux-foundation.org, hughd@google.com Cc: willy@infradead.org, david@redhat.com, ioworker0@gmail.com, wangkefeng.wang@huawei.com, ying.huang@intel.com, 21cnbao@gmail.com, ryan.roberts@arm.com, shy828301@gmail.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/8] mm: shmem: add multi-size THP sysfs interface for anonymous shmem Date: Mon, 6 May 2024 16:46:29 +0800 Message-Id: <6b4afed1ef26dbd08ae9ec58449b329564dcef3e.1714978902.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: References: 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 Content-Type: text/plain; charset="utf-8" To support the use of mTHP with anonymous shmem, add a new sysfs interface 'shmem_enabled' in the '/sys/kernel/mm/transparent_hugepage/hugepages-kB/' directory for each mTHP to control whether shmem is enabled for that mTHP, with a value similar to the top level 'shmem_enabled', which can be set to: "always", "inherit (to inherit the top level setting)", "within_size", "adv= ise", "never", "deny", "force". These values follow the same semantics as the top level, except the 'deny' is equivalent to 'never', and 'force' is equivalent to 'always' to keep compatibility. By default, PMD-sized hugepages have enabled=3D"inherit" and all other huge= page sizes have enabled=3D"never" for '/sys/kernel/mm/transparent_hugepage/hugep= ages-xxkB/shmem_enabled'. In addition, if top level value is 'force', then only PMD-sized hugepages have enabled=3D"inherit", otherwise configuration will be failed and vice v= ersa. That means now we will avoid using non-PMD sized THP to override the global huge allocation. Signed-off-by: Baolin Wang --- Documentation/admin-guide/mm/transhuge.rst | 29 +++++++ include/linux/huge_mm.h | 10 +++ mm/huge_memory.c | 11 +-- mm/shmem.c | 96 ++++++++++++++++++++++ 4 files changed, 138 insertions(+), 8 deletions(-) diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/adm= in-guide/mm/transhuge.rst index 076443cc10a6..a28496e15bdb 100644 --- a/Documentation/admin-guide/mm/transhuge.rst +++ b/Documentation/admin-guide/mm/transhuge.rst @@ -332,6 +332,35 @@ deny force Force the huge option on for all - very useful for testing; =20 +Anonymous shmem can also use "multi-size THP" (mTHP) by adding a new sysfs= knob +to control mTHP allocation: /sys/kernel/mm/transparent_hugepage/hugepages-= kB/shmem_enabled. +Its value for each mTHP is essentially consistent with the global setting,= except +for the addition of 'inherit' to ensure compatibility with the global sett= ings. +always + Attempt to allocate huge pages every time we need a new page; + +inherit + Inherit the top-level "shmem_enabled" value. By default, PMD-sized hug= epages + have enabled=3D"inherit" and all other hugepage sizes have enabled=3D"= never"; + +never + Do not allocate huge pages; + +within_size + Only allocate huge page if it will be fully within i_size. + Also respect fadvise()/madvise() hints; + +advise + Only allocate huge pages if requested with fadvise()/madvise(); + +deny + Has the same semantics as 'never', now mTHP allocation policy is only + used for anonymous shmem and no not override tmpfs. + +force + Has the same semantics as 'always', now mTHP allocation policy is only + used for anonymous shmem and no not override tmpfs. + Need of application restart =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D =20 diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index e49b56c40a11..dbd6b3f56210 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -6,6 +6,7 @@ #include =20 #include /* only for vma_is_dax() */ +#include =20 vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf); int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, @@ -63,6 +64,7 @@ ssize_t single_hugepage_flag_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf, enum transparent_hugepage_flag flag); extern struct kobj_attribute shmem_enabled_attr; +extern struct kobj_attribute thpsize_shmem_enabled_attr; =20 /* * Mask of all large folio orders supported for anonymous THP; all orders = up to @@ -265,6 +267,14 @@ unsigned long thp_vma_allowable_orders(struct vm_area_= struct *vma, return __thp_vma_allowable_orders(vma, vm_flags, tva_flags, orders); } =20 +struct thpsize { + struct kobject kobj; + struct list_head node; + int order; +}; + +#define to_thpsize(kobj) container_of(kobj, struct thpsize, kobj) + enum mthp_stat_item { MTHP_STAT_ANON_FAULT_ALLOC, MTHP_STAT_ANON_FAULT_FALLBACK, diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 9efb6fefc391..d3080a8843f2 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -449,14 +449,6 @@ static void thpsize_release(struct kobject *kobj); static DEFINE_SPINLOCK(huge_anon_orders_lock); static LIST_HEAD(thpsize_list); =20 -struct thpsize { - struct kobject kobj; - struct list_head node; - int order; -}; - -#define to_thpsize(kobj) container_of(kobj, struct thpsize, kobj) - static ssize_t thpsize_enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { @@ -517,6 +509,9 @@ static struct kobj_attribute thpsize_enabled_attr =3D =20 static struct attribute *thpsize_attrs[] =3D { &thpsize_enabled_attr.attr, +#ifdef CONFIG_SHMEM + &thpsize_shmem_enabled_attr.attr, +#endif NULL, }; =20 diff --git a/mm/shmem.c b/mm/shmem.c index a383ea9a89a5..59cc26d44344 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -131,6 +131,14 @@ struct shmem_options { #define SHMEM_SEEN_QUOTA 32 }; =20 +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static unsigned long huge_anon_shmem_orders_always __read_mostly; +static unsigned long huge_anon_shmem_orders_madvise __read_mostly; +static unsigned long huge_anon_shmem_orders_inherit __read_mostly; +static unsigned long huge_anon_shmem_orders_within_size __read_mostly; +static DEFINE_SPINLOCK(huge_anon_shmem_orders_lock); +#endif + #ifdef CONFIG_TMPFS static unsigned long shmem_default_max_blocks(void) { @@ -4687,6 +4695,12 @@ void __init shmem_init(void) SHMEM_SB(shm_mnt->mnt_sb)->huge =3D shmem_huge; else shmem_huge =3D SHMEM_HUGE_NEVER; /* just in case it was patched */ + + /* + * Default to setting PMD-sized THP to inherit the global setting and + * disable all other multi-size THPs, when anonymous shmem uses mTHP. + */ + huge_anon_shmem_orders_inherit =3D BIT(HPAGE_PMD_ORDER); #endif return; =20 @@ -4746,6 +4760,11 @@ static ssize_t shmem_enabled_store(struct kobject *k= obj, huge !=3D SHMEM_HUGE_NEVER && huge !=3D SHMEM_HUGE_DENY) return -EINVAL; =20 + /* Do not override huge allocation policy with non-PMD sized mTHP */ + if (huge =3D=3D SHMEM_HUGE_FORCE && + huge_anon_shmem_orders_inherit !=3D BIT(HPAGE_PMD_ORDER)) + return -EINVAL; + shmem_huge =3D huge; if (shmem_huge > SHMEM_HUGE_DENY) SHMEM_SB(shm_mnt->mnt_sb)->huge =3D shmem_huge; @@ -4753,6 +4772,83 @@ static ssize_t shmem_enabled_store(struct kobject *k= obj, } =20 struct kobj_attribute shmem_enabled_attr =3D __ATTR_RW(shmem_enabled); + +static ssize_t thpsize_shmem_enabled_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + int order =3D to_thpsize(kobj)->order; + const char *output; + + if (test_bit(order, &huge_anon_shmem_orders_always)) + output =3D "[always] inherit within_size advise never deny [force]"; + else if (test_bit(order, &huge_anon_shmem_orders_inherit)) + output =3D "always [inherit] within_size advise never deny force"; + else if (test_bit(order, &huge_anon_shmem_orders_within_size)) + output =3D "always inherit [within_size] advise never deny force"; + else if (test_bit(order, &huge_anon_shmem_orders_madvise)) + output =3D "always inherit within_size [advise] never deny force"; + else + output =3D "always inherit within_size advise [never] [deny] force"; + + return sysfs_emit(buf, "%s\n", output); +} + +static ssize_t thpsize_shmem_enabled_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int order =3D to_thpsize(kobj)->order; + ssize_t ret =3D count; + + if (sysfs_streq(buf, "always") || sysfs_streq(buf, "force")) { + spin_lock(&huge_anon_shmem_orders_lock); + clear_bit(order, &huge_anon_shmem_orders_inherit); + clear_bit(order, &huge_anon_shmem_orders_madvise); + clear_bit(order, &huge_anon_shmem_orders_within_size); + set_bit(order, &huge_anon_shmem_orders_always); + spin_unlock(&huge_anon_shmem_orders_lock); + } else if (sysfs_streq(buf, "inherit")) { + /* Do not override huge allocation policy with non-PMD sized mTHP */ + if (shmem_huge =3D=3D SHMEM_HUGE_FORCE && + order !=3D HPAGE_PMD_ORDER) + return -EINVAL; + + spin_lock(&huge_anon_shmem_orders_lock); + clear_bit(order, &huge_anon_shmem_orders_always); + clear_bit(order, &huge_anon_shmem_orders_madvise); + clear_bit(order, &huge_anon_shmem_orders_within_size); + set_bit(order, &huge_anon_shmem_orders_inherit); + spin_unlock(&huge_anon_shmem_orders_lock); + } else if (sysfs_streq(buf, "within_size")) { + spin_lock(&huge_anon_shmem_orders_lock); + clear_bit(order, &huge_anon_shmem_orders_always); + clear_bit(order, &huge_anon_shmem_orders_inherit); + clear_bit(order, &huge_anon_shmem_orders_madvise); + set_bit(order, &huge_anon_shmem_orders_within_size); + spin_unlock(&huge_anon_shmem_orders_lock); + } else if (sysfs_streq(buf, "madvise")) { + spin_lock(&huge_anon_shmem_orders_lock); + clear_bit(order, &huge_anon_shmem_orders_always); + clear_bit(order, &huge_anon_shmem_orders_inherit); + clear_bit(order, &huge_anon_shmem_orders_within_size); + set_bit(order, &huge_anon_shmem_orders_madvise); + spin_unlock(&huge_anon_shmem_orders_lock); + } else if (sysfs_streq(buf, "never") || sysfs_streq(buf, "deny")) { + spin_lock(&huge_anon_shmem_orders_lock); + clear_bit(order, &huge_anon_shmem_orders_always); + clear_bit(order, &huge_anon_shmem_orders_inherit); + clear_bit(order, &huge_anon_shmem_orders_within_size); + clear_bit(order, &huge_anon_shmem_orders_madvise); + spin_unlock(&huge_anon_shmem_orders_lock); + } else { + ret =3D -EINVAL; + } + + return ret; +} + +struct kobj_attribute thpsize_shmem_enabled_attr =3D + __ATTR(shmem_enabled, 0644, thpsize_shmem_enabled_show, thpsize_shmem_ena= bled_store); #endif /* CONFIG_TRANSPARENT_HUGEPAGE && CONFIG_SYSFS */ =20 #else /* !CONFIG_SHMEM */ --=20 2.39.3