From patchwork Mon Feb 11 22:44:37 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Jordan X-Patchwork-Id: 1040209 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43z1QP6pN7z9s3x for ; Tue, 12 Feb 2019 09:57:33 +1100 (AEDT) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=oracle.com header.i=@oracle.com header.b="EG0ZXxRI"; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43z1QP5mGSzDqcP for ; 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Mon, 11 Feb 2019 22:44:55 GMT Received: from abhmp0022.oracle.com (abhmp0022.oracle.com [141.146.116.28]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x1BMisBM026862; Mon, 11 Feb 2019 22:44:54 GMT Received: from localhost.localdomain (/73.60.114.248) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 11 Feb 2019 14:44:54 -0800 From: Daniel Jordan To: jgg@ziepe.ca Subject: [PATCH 5/5] kvm/book3s: use pinned_vm instead of locked_vm to account pinned pages Date: Mon, 11 Feb 2019 17:44:37 -0500 Message-Id: <20190211224437.25267-6-daniel.m.jordan@oracle.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190211224437.25267-1-daniel.m.jordan@oracle.com> References: <20190211224437.25267-1-daniel.m.jordan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9164 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902110162 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: dave@stgolabs.net, jack@suse.cz, kvm@vger.kernel.org, atull@kernel.org, aik@ozlabs.ru, linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, daniel.m.jordan@oracle.com, linux-mm@kvack.org, alex.williamson@redhat.com, mdf@kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, cl@linux.com, hao.wu@intel.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" Memory used for TCE tables in kvm_vm_ioctl_create_spapr_tce is currently accounted to locked_vm because it stays resident and its allocation is directly triggered from userspace as explained in f8626985c7c2 ("KVM: PPC: Account TCE-containing pages in locked_vm"). However, since the memory comes straight from the page allocator (and to a lesser extent unreclaimable slab) and is effectively pinned, it should be accounted with pinned_vm (see bc3e53f682d9 ("mm: distinguish between mlocked and pinned pages")). pinned_vm recently became atomic and so no longer relies on mmap_sem held as writer: delete. Signed-off-by: Daniel Jordan --- arch/powerpc/kvm/book3s_64_vio.c | 35 ++++++++++++++------------------ 1 file changed, 15 insertions(+), 20 deletions(-) diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index 532ab79734c7..2f8d7c051e4e 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -56,39 +56,34 @@ static unsigned long kvmppc_stt_pages(unsigned long tce_pages) return tce_pages + ALIGN(stt_bytes, PAGE_SIZE) / PAGE_SIZE; } -static long kvmppc_account_memlimit(unsigned long stt_pages, bool inc) +static long kvmppc_account_memlimit(unsigned long pages, bool inc) { long ret = 0; + s64 pinned_vm; if (!current || !current->mm) return ret; /* process exited */ - down_write(¤t->mm->mmap_sem); - if (inc) { - unsigned long locked, lock_limit; + unsigned long lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - locked = current->mm->locked_vm + stt_pages; - lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; - if (locked > lock_limit && !capable(CAP_IPC_LOCK)) + pinned_vm = atomic64_add_return(pages, ¤t->mm->pinned_vm); + if (pinned_vm > lock_limit && !capable(CAP_IPC_LOCK)) { ret = -ENOMEM; - else - current->mm->locked_vm += stt_pages; + atomic64_sub(pages, ¤t->mm->pinned_vm); + } } else { - if (WARN_ON_ONCE(stt_pages > current->mm->locked_vm)) - stt_pages = current->mm->locked_vm; + pinned_vm = atomic64_read(¤t->mm->pinned_vm); + if (WARN_ON_ONCE(pages > pinned_vm)) + pages = pinned_vm; - current->mm->locked_vm -= stt_pages; + atomic64_sub(pages, ¤t->mm->pinned_vm); } - pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%ld %ld/%ld%s\n", current->pid, - inc ? '+' : '-', - stt_pages << PAGE_SHIFT, - current->mm->locked_vm << PAGE_SHIFT, - rlimit(RLIMIT_MEMLOCK), - ret ? " - exceeded" : ""); - - up_write(¤t->mm->mmap_sem); + pr_debug("[%d] RLIMIT_MEMLOCK KVM %c%lu %ld/%lu%s\n", current->pid, + inc ? '+' : '-', pages << PAGE_SHIFT, + atomic64_read(¤t->mm->pinned_vm) << PAGE_SHIFT, + rlimit(RLIMIT_MEMLOCK), ret ? " - exceeded" : ""); return ret; }