From owner-svn-src-stable-11@freebsd.org Mon Dec 18 22:55:21 2017 Return-Path: Delivered-To: svn-src-stable-11@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 34EA0E8FC63; Mon, 18 Dec 2017 22:55:21 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 0E3E275550; Mon, 18 Dec 2017 22:55:20 +0000 (UTC) (envelope-from rmacklem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id vBIMtK8q054606; Mon, 18 Dec 2017 22:55:20 GMT (envelope-from rmacklem@FreeBSD.org) Received: (from rmacklem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id vBIMtKVv054605; Mon, 18 Dec 2017 22:55:20 GMT (envelope-from rmacklem@FreeBSD.org) Message-Id: <201712182255.vBIMtKVv054605@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: rmacklem set sender to rmacklem@FreeBSD.org using -f From: Rick Macklem Date: Mon, 18 Dec 2017 22:55:20 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r326952 - stable/11/sys/fs/nfsserver X-SVN-Group: stable-11 X-SVN-Commit-Author: rmacklem X-SVN-Commit-Paths: stable/11/sys/fs/nfsserver X-SVN-Commit-Revision: 326952 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-11@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: SVN commit messages for only the 11-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Dec 2017 22:55:21 -0000 Author: rmacklem Date: Mon Dec 18 22:55:19 2017 New Revision: 326952 URL: https://svnweb.freebsd.org/changeset/base/326952 Log: MFC: r326544 Avoid the overhead of acquiring a lock in nfsrv_checkgetattr() when there are no write delegations issued. manu@ reported on the freebsd-current@ mailing list that there was a significant performance hit in nfsrv_checkgetattr() caused by the acquisition/release of a state lock, even when there were no write delegations issued. This patch add a count of outstanding issued write delegations to the NFSv4 server. This count allows nfsrv_checkgetattr() to return without acquiring any lock when the count is 0, avoiding the performance hit for the case where no write delegations are issued. Modified: stable/11/sys/fs/nfsserver/nfs_nfsdstate.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/fs/nfsserver/nfs_nfsdstate.c ============================================================================== --- stable/11/sys/fs/nfsserver/nfs_nfsdstate.c Mon Dec 18 20:17:54 2017 (r326951) +++ stable/11/sys/fs/nfsserver/nfs_nfsdstate.c Mon Dec 18 22:55:19 2017 (r326952) @@ -93,6 +93,7 @@ static time_t nfsrvboottime; static int nfsrv_returnoldstateid = 0, nfsrv_clients = 0; static int nfsrv_clienthighwater = NFSRV_CLIENTHIGHWATER; static int nfsrv_nogsscallback = 0; +static volatile int nfsrv_writedelegcnt = 0; /* local functions */ static void nfsrv_dumpaclient(struct nfsclient *clp, @@ -1261,6 +1262,8 @@ nfsrv_freedeleg(struct nfsstate *stp) LIST_REMOVE(stp, ls_hash); LIST_REMOVE(stp, ls_list); LIST_REMOVE(stp, ls_file); + if ((stp->ls_flags & NFSLCK_DELEGWRITE) != 0) + nfsrv_writedelegcnt--; lfp = stp->ls_lfp; if (LIST_EMPTY(&lfp->lf_open) && LIST_EMPTY(&lfp->lf_lock) && LIST_EMPTY(&lfp->lf_deleg) && @@ -2905,6 +2908,7 @@ tryagain: new_deleg->ls_flags = (NFSLCK_DELEGWRITE | NFSLCK_READACCESS | NFSLCK_WRITEACCESS); *rflagsp |= NFSV4OPEN_WRITEDELEGATE; + nfsrv_writedelegcnt++; } else { new_deleg->ls_flags = (NFSLCK_DELEGREAD | NFSLCK_READACCESS); @@ -3035,6 +3039,7 @@ tryagain: new_deleg->ls_clp = clp; new_deleg->ls_filerev = filerev; new_deleg->ls_compref = nd->nd_compref; + nfsrv_writedelegcnt++; LIST_INSERT_HEAD(&lfp->lf_deleg, new_deleg, ls_file); LIST_INSERT_HEAD(NFSSTATEHASH(clp, new_deleg->ls_stateid), new_deleg, ls_hash); @@ -3092,6 +3097,7 @@ tryagain: new_deleg->ls_flags = (NFSLCK_DELEGWRITE | NFSLCK_READACCESS | NFSLCK_WRITEACCESS); *rflagsp |= NFSV4OPEN_WRITEDELEGATE; + nfsrv_writedelegcnt++; } else { new_deleg->ls_flags = (NFSLCK_DELEGREAD | NFSLCK_READACCESS); @@ -3168,6 +3174,7 @@ tryagain: NFSLCK_READACCESS | NFSLCK_WRITEACCESS); *rflagsp |= NFSV4OPEN_WRITEDELEGATE; + nfsrv_writedelegcnt++; } else { new_deleg->ls_flags = (NFSLCK_DELEGREAD | @@ -5297,6 +5304,8 @@ nfsrv_checkgetattr(struct nfsrv_descript *nd, vnode_t NFSCBGETATTR_ATTRBIT(attrbitp, &cbbits); if (!NFSNONZERO_ATTRBIT(&cbbits)) + goto out; + if (nfsrv_writedelegcnt == 0) goto out; /*