From nobody Fri Feb 13 03:18:59 2026 Received: from out30-111.freemail.mail.aliyun.com (out30-111.freemail.mail.aliyun.com [115.124.30.111]) (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 1F2A71459EC for ; Tue, 4 Jun 2024 10:18:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.111 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717496303; cv=none; b=XoD4Qcg3LNaIT7BP6cmZAYBShtrZT6LKVFucg2PuYa8VU0hyz52UPyDaPkQVlBO8oGLAKluDV7ImDoWWoHsjVYUIrNQh+/YmAIWwK5H4JjPzTLWKlxXTVg8GWX0Vh9fatnu71cZiuZhKSuXYGLYGcWxkBkst1u1NRo0ys4WO7P4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1717496303; c=relaxed/simple; bh=rP21fUuQQQToDvqa5Zoy0et3OXxLIaOzGgJakF6b+H4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=h80zjaalGKsQnvttARdRc/379Iu2i21PPvSjTFmlb+zmQHbyH72MWUK/G/YfWEnwacDvo5mLrGF2CisiIOosxnJ2lOTFSyVo4qwNshNdz/axXysa4pqxrmpiOAIcO1z7Xuz81rWiYut3y0fZv5EjElz+J1SDES86QxgEPHn+IZM= 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=Xg8KIn88; arc=none smtp.client-ip=115.124.30.111 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="Xg8KIn88" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1717496293; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=mF0SOFHOYjsa4DTAJ1q9V/3Dk01gX+rLS8KbnSGFj9Q=; b=Xg8KIn88zwHc/B3tvibj+yVf1vRdVQfmY4uLgkTgp9ix6aZhmWjJrf/5o0smegHIKSUv3rE490HvbMMl/V/oGu1un8T2GQxAkS1+A3tQHUb1zxpoz+PD69MI3xLzT+aM6cax6kcmJwdKv9kdfXoFm1tnOHFJz37rRvdpV/Cd2j8= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037067113;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=16;SR=0;TI=SMTPD_---0W7qooJc_1717496289; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0W7qooJc_1717496289) by smtp.aliyun-inc.com; Tue, 04 Jun 2024 18:18:09 +0800 From: Baolin Wang To: akpm@linux-foundation.org, hughd@google.com Cc: willy@infradead.org, david@redhat.com, wangkefeng.wang@huawei.com, ying.huang@intel.com, 21cnbao@gmail.com, ryan.roberts@arm.com, shy828301@gmail.com, ziy@nvidia.com, ioworker0@gmail.com, da.gomez@samsung.com, p.raghav@samsung.com, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 5/6] mm: shmem: add mTHP size alignment in shmem_get_unmapped_area Date: Tue, 4 Jun 2024 18:17:49 +0800 Message-Id: <1d2f719d558d5c789c4cceebdaac42a814e8f107.1717495894.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" Although the top-level hugepage allocation can be turned off, anonymous shm= em can still use mTHP by configuring the sysfs interface located at '/sys/kernel/mm/transparent_hugepage/hugepage-XXkb/shmem_enabled'. Therefor= e, add alignment for mTHP size to provide a suitable alignment address in shmem_get_unmapped_area(). Signed-off-by: Baolin Wang Tested-by: Lance Yang --- mm/shmem.c | 40 +++++++++++++++++++++++++++++++--------- 1 file changed, 31 insertions(+), 9 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 9a8533482208..2ecc41521dbb 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2394,6 +2394,7 @@ unsigned long shmem_get_unmapped_area(struct file *fi= le, unsigned long inflated_len; unsigned long inflated_addr; unsigned long inflated_offset; + unsigned long hpage_size; =20 if (len > TASK_SIZE) return -ENOMEM; @@ -2412,8 +2413,6 @@ unsigned long shmem_get_unmapped_area(struct file *fi= le, =20 if (shmem_huge =3D=3D SHMEM_HUGE_DENY) return addr; - if (len < HPAGE_PMD_SIZE) - return addr; if (flags & MAP_FIXED) return addr; /* @@ -2425,8 +2424,11 @@ unsigned long shmem_get_unmapped_area(struct file *f= ile, if (uaddr =3D=3D addr) return addr; =20 + hpage_size =3D HPAGE_PMD_SIZE; if (shmem_huge !=3D SHMEM_HUGE_FORCE) { struct super_block *sb; + unsigned long __maybe_unused hpage_orders; + int order =3D 0; =20 if (file) { VM_BUG_ON(file->f_op !=3D &shmem_file_operations); @@ -2439,18 +2441,38 @@ unsigned long shmem_get_unmapped_area(struct file *= file, if (IS_ERR(shm_mnt)) return addr; sb =3D shm_mnt->mnt_sb; + + /* + * Find the highest mTHP order used for anonymous shmem to + * provide a suitable alignment address. + */ +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + hpage_orders =3D READ_ONCE(huge_anon_shmem_orders_always); + hpage_orders |=3D READ_ONCE(huge_anon_shmem_orders_within_size); + hpage_orders |=3D READ_ONCE(huge_anon_shmem_orders_madvise); + if (SHMEM_SB(sb)->huge !=3D SHMEM_HUGE_NEVER) + hpage_orders |=3D READ_ONCE(huge_anon_shmem_orders_inherit); + + if (hpage_orders > 0) { + order =3D highest_order(hpage_orders); + hpage_size =3D PAGE_SIZE << order; + } +#endif } - if (SHMEM_SB(sb)->huge =3D=3D SHMEM_HUGE_NEVER) + if (SHMEM_SB(sb)->huge =3D=3D SHMEM_HUGE_NEVER && !order) return addr; } =20 - offset =3D (pgoff << PAGE_SHIFT) & (HPAGE_PMD_SIZE-1); - if (offset && offset + len < 2 * HPAGE_PMD_SIZE) + if (len < hpage_size) + return addr; + + offset =3D (pgoff << PAGE_SHIFT) & (hpage_size - 1); + if (offset && offset + len < 2 * hpage_size) return addr; - if ((addr & (HPAGE_PMD_SIZE-1)) =3D=3D offset) + if ((addr & (hpage_size - 1)) =3D=3D offset) return addr; =20 - inflated_len =3D len + HPAGE_PMD_SIZE - PAGE_SIZE; + inflated_len =3D len + hpage_size - PAGE_SIZE; if (inflated_len > TASK_SIZE) return addr; if (inflated_len < len) @@ -2463,10 +2485,10 @@ unsigned long shmem_get_unmapped_area(struct file *= file, if (inflated_addr & ~PAGE_MASK) return addr; =20 - inflated_offset =3D inflated_addr & (HPAGE_PMD_SIZE-1); + inflated_offset =3D inflated_addr & (hpage_size - 1); inflated_addr +=3D offset - inflated_offset; if (inflated_offset > offset) - inflated_addr +=3D HPAGE_PMD_SIZE; + inflated_addr +=3D hpage_size; =20 if (inflated_addr > TASK_SIZE - len) return addr; --=20 2.39.3