From owner-svn-src-head@freebsd.org Tue Dec 11 01:38:51 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id B5ABA130FC32; Tue, 11 Dec 2018 01:38:51 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 5CDB17A88C; Tue, 11 Dec 2018 01:38:51 +0000 (UTC) (envelope-from cem@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 mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 3A791282AA; Tue, 11 Dec 2018 01:38:51 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wBB1cpfE006661; Tue, 11 Dec 2018 01:38:51 GMT (envelope-from cem@FreeBSD.org) Received: (from cem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wBB1cp1p006660; Tue, 11 Dec 2018 01:38:51 GMT (envelope-from cem@FreeBSD.org) Message-Id: <201812110138.wBB1cp1p006660@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: cem set sender to cem@FreeBSD.org using -f From: Conrad Meyer Date: Tue, 11 Dec 2018 01:38:51 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r341803 - head/libexec/rc X-SVN-Group: head X-SVN-Commit-Author: cem X-SVN-Commit-Paths: head/libexec/rc X-SVN-Commit-Revision: 341803 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5CDB17A88C X-Spamd-Result: default: False [-2.98 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; NEURAL_HAM_LONG(-1.00)[-0.998,0]; NEURAL_HAM_SHORT(-0.98)[-0.979,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 11 Dec 2018 01:38:51 -0000 Author: cem Date: Tue Dec 11 01:38:50 2018 New Revision: 341803 URL: https://svnweb.freebsd.org/changeset/base/341803 Log: rc.subr: Implement list_vars without using 'read' 'read' pessimistically read(2)s one byte at a time, which can be quite silly for large environments in slow emulators. In my boring user environment, truss shows that the number of read() syscalls to source rc.subr and invoke list_vars is reduced by something like 3400 to 60. ministat(1) shows a significant time difference of about -71% for my environment. Suggested by: jilles Discussed with: dteske, jhb, jilles Differential Revision: https://reviews.freebsd.org/D18481 Modified: head/libexec/rc/rc.subr Modified: head/libexec/rc/rc.subr ============================================================================== --- head/libexec/rc/rc.subr Mon Dec 10 21:47:19 2018 (r341802) +++ head/libexec/rc/rc.subr Tue Dec 11 01:38:50 2018 (r341803) @@ -58,17 +58,29 @@ JID=0 # --------- # list_vars pattern -# List vars matching pattern. +# List variables matching glob pattern. # list_vars() { - set | { while read LINE; do - var="${LINE%%=*}" - case "$var" in - "$LINE"|*[!a-zA-Z0-9_]*) continue ;; - $1) echo $var + # Localize 'set' option below. + local - + local IFS=$'\n' line varname + + # Disable path expansion in unquoted 'for' parameters below. + set -o noglob + + for line in $(set); do + varname="${line%%=*}" + + case "$varname" in + "$line"|*[!a-zA-Z0-9_]*) + continue + ;; + $1) + echo $varname + ;; esac - done; } + done } # set_rcvar [var] [defval] [desc]