From nobody Tue Oct 05 18:47:42 2021 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 0130617EB994; Tue, 5 Oct 2021 18:47:44 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HP65q2mLzz4gxs; Tue, 5 Oct 2021 18:47:43 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 1020C11D39; Tue, 5 Oct 2021 18:47:43 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 195Ilg3s034231; Tue, 5 Oct 2021 18:47:43 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 195IlgUf034230; Tue, 5 Oct 2021 18:47:42 GMT (envelope-from git) Date: Tue, 5 Oct 2021 18:47:42 GMT Message-Id: <202110051847.195IlgUf034230@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Alexander Motin Subject: git: 7835b2cb4a1a - main - sbuf(9): Microoptimize sbuf_put_byte() List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: mav X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 7835b2cb4a1ae57f403739a2f1076ec7188f18c9 Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch main has been updated by mav: URL: https://cgit.FreeBSD.org/src/commit/?id=7835b2cb4a1ae57f403739a2f1076ec7188f18c9 commit 7835b2cb4a1ae57f403739a2f1076ec7188f18c9 Author: Alexander Motin AuthorDate: 2021-10-05 18:42:47 +0000 Commit: Alexander Motin CommitDate: 2021-10-05 18:47:38 +0000 sbuf(9): Microoptimize sbuf_put_byte() This function is actively used by sbuf_vprintf(), so this simple inlining in half reduces time of kern.geom.confxml generation. MFC after: 2 weeks Sponsored by: iXsystem, Inc. --- sys/kern/subr_sbuf.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/sys/kern/subr_sbuf.c b/sys/kern/subr_sbuf.c index b7f135e81206..6c533f36c82e 100644 --- a/sys/kern/subr_sbuf.c +++ b/sys/kern/subr_sbuf.c @@ -480,7 +480,26 @@ static void sbuf_put_byte(struct sbuf *s, char c) { - sbuf_put_bytes(s, &c, 1); + assert_sbuf_integrity(s); + assert_sbuf_state(s, 0); + + if (__predict_false(s->s_error != 0)) + return; + if (__predict_false(SBUF_FREESPACE(s) <= 0)) { + /* + * If there is a drain, use it, otherwise extend the + * buffer. + */ + if (s->s_drain_func != NULL) + (void)sbuf_drain(s); + else if (sbuf_extend(s, 1) < 0) + s->s_error = ENOMEM; + if (s->s_error != 0) + return; + } + s->s_buf[s->s_len++] = c; + if (SBUF_ISSECTION(s)) + s->s_sect_len++; } /* @@ -623,7 +642,7 @@ static void sbuf_putc_func(int c, void *arg) { - if (c != '\0') + if (__predict_true(c != '\0')) sbuf_put_byte(arg, c); }