From patchwork Wed Feb 23 01:59:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 12756148 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C1FDC433F5 for ; Wed, 23 Feb 2022 01:59:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236446AbiBWCAT (ORCPT ); Tue, 22 Feb 2022 21:00:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230187AbiBWCAS (ORCPT ); Tue, 22 Feb 2022 21:00:18 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id AEEB23BFBC for ; Tue, 22 Feb 2022 17:59:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1645581590; 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=NzrOnScghuuM7a/4yh+tcSZrALDgJORzMyldBpF93TA=; b=FH7l2AKDZn8Ez9u/ESlSFkKcmjXzYP+A76psRHrnTvQ10h47w340rRMqbRunVLOwi71lO8 bFPWrImgXWHWqJZwn6/yu8CeYCulSKOyRxbQowSEeVN/e41aIGIb3AZhsmYs6Cv6j6/QjN aA8/nZli3QPnIltEt7/PiG72WoeK3PQ= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-68-9XZnIAb0NHeo3OgckHV6mQ-1; Tue, 22 Feb 2022 20:59:47 -0500 X-MC-Unique: 9XZnIAb0NHeo3OgckHV6mQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4CCF91091DA1; Wed, 23 Feb 2022 01:59:46 +0000 (UTC) Received: from lxbceph1.gsslab.pek2.redhat.com (unknown [10.72.47.117]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5ECA761F20; Wed, 23 Feb 2022 01:59:41 +0000 (UTC) From: xiubli@redhat.com To: jlayton@kernel.org Cc: idryomov@gmail.com, vshankar@redhat.com, ceph-devel@vger.kernel.org, Xiubo Li Subject: [PATCH v3 1/2] ceph: allocate capsnap memory outside of ceph_queue_cap_snap() Date: Wed, 23 Feb 2022 09:59:33 +0800 Message-Id: <20220223015934.37379-2-xiubli@redhat.com> In-Reply-To: <20220223015934.37379-1-xiubli@redhat.com> References: <20220223015934.37379-1-xiubli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Xiubo Li This will reduce very possible but unnecessary frequently memory allocate/free in this loop. URL: https://tracker.ceph.com/issues/44100 Signed-off-by: Xiubo Li --- fs/ceph/snap.c | 46 ++++++++++++++++++++++++++++------------------ 1 file changed, 28 insertions(+), 18 deletions(-) diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c index cc9097c27052..b75dcc9a36b6 100644 --- a/fs/ceph/snap.c +++ b/fs/ceph/snap.c @@ -522,23 +522,15 @@ static bool has_new_snaps(struct ceph_snap_context *o, * Caller must hold snap_rwsem for read (i.e., the realm topology won't * change). */ -static void ceph_queue_cap_snap(struct ceph_inode_info *ci) +static void ceph_queue_cap_snap(struct ceph_inode_info *ci, + struct ceph_cap_snap **pcapsnap) { struct inode *inode = &ci->vfs_inode; - struct ceph_cap_snap *capsnap; struct ceph_snap_context *old_snapc, *new_snapc; + struct ceph_cap_snap *capsnap = *pcapsnap; struct ceph_buffer *old_blob = NULL; int used, dirty; - capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS); - if (!capsnap) { - pr_err("ENOMEM allocating ceph_cap_snap on %p\n", inode); - return; - } - capsnap->cap_flush.is_capsnap = true; - INIT_LIST_HEAD(&capsnap->cap_flush.i_list); - INIT_LIST_HEAD(&capsnap->cap_flush.g_list); - spin_lock(&ci->i_ceph_lock); used = __ceph_caps_used(ci); dirty = __ceph_caps_dirty(ci); @@ -595,9 +587,6 @@ static void ceph_queue_cap_snap(struct ceph_inode_info *ci) capsnap->need_flush ? "" : "no_flush"); ihold(inode); - refcount_set(&capsnap->nref, 1); - INIT_LIST_HEAD(&capsnap->ci_item); - capsnap->follows = old_snapc->seq; capsnap->issued = __ceph_caps_issued(ci, NULL); capsnap->dirty = dirty; @@ -635,7 +624,7 @@ static void ceph_queue_cap_snap(struct ceph_inode_info *ci) /* note mtime, size NOW. */ __ceph_finish_cap_snap(ci, capsnap); } - capsnap = NULL; + *pcapsnap = NULL; old_snapc = NULL; update_snapc: @@ -651,8 +640,6 @@ static void ceph_queue_cap_snap(struct ceph_inode_info *ci) spin_unlock(&ci->i_ceph_lock); ceph_buffer_put(old_blob); - if (capsnap) - kmem_cache_free(ceph_cap_snap_cachep, capsnap); ceph_put_snap_context(old_snapc); } @@ -720,6 +707,7 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm) { struct ceph_inode_info *ci; struct inode *lastinode = NULL; + struct ceph_cap_snap *capsnap = NULL; dout("queue_realm_cap_snaps %p %llx inodes\n", realm, realm->ino); @@ -731,12 +719,34 @@ static void queue_realm_cap_snaps(struct ceph_snap_realm *realm) spin_unlock(&realm->inodes_with_caps_lock); iput(lastinode); lastinode = inode; - ceph_queue_cap_snap(ci); + + /* + * Allocate the capsnap memory outside of ceph_queue_cap_snap() + * to reduce very possible but unnecessary frequently memory + * allocate/free in this loop. + */ + if (!capsnap) { + capsnap = kmem_cache_zalloc(ceph_cap_snap_cachep, GFP_NOFS); + if (!capsnap) { + pr_err("ENOMEM allocating ceph_cap_snap on %p\n", + inode); + return; + } + } + capsnap->cap_flush.is_capsnap = true; + refcount_set(&capsnap->nref, 1); + INIT_LIST_HEAD(&capsnap->cap_flush.i_list); + INIT_LIST_HEAD(&capsnap->cap_flush.g_list); + INIT_LIST_HEAD(&capsnap->ci_item); + + ceph_queue_cap_snap(ci, &capsnap); spin_lock(&realm->inodes_with_caps_lock); } spin_unlock(&realm->inodes_with_caps_lock); iput(lastinode); + if (capsnap) + kmem_cache_free(ceph_cap_snap_cachep, capsnap); dout("queue_realm_cap_snaps %p %llx done\n", realm, realm->ino); }