From owner-dev-commits-src-branches@freebsd.org Tue Sep 14 12:52:13 2021 Return-Path: Delivered-To: dev-commits-src-branches@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 7443C668EAA; Tue, 14 Sep 2021 12:52:13 +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 4H83CK26VKz4h9K; Tue, 14 Sep 2021 12:52:13 +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 E00F61B28F; Tue, 14 Sep 2021 12:52:12 +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 18ECqCLB016195; Tue, 14 Sep 2021 12:52:12 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 18ECqCrv016194; Tue, 14 Sep 2021 12:52:12 GMT (envelope-from git) Date: Tue, 14 Sep 2021 12:52:12 GMT Message-Id: <202109141252.18ECqCrv016194@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mark Johnston Subject: git: ad9f3a91d521 - stable/13 - libc: Use the initial-exec TLS model MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: markj X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: ad9f3a91d52105564dc32e5c0132377c74c3a204 Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Sep 2021 12:52:13 -0000 The branch stable/13 has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=ad9f3a91d52105564dc32e5c0132377c74c3a204 commit ad9f3a91d52105564dc32e5c0132377c74c3a204 Author: Mark Johnston AuthorDate: 2021-07-16 02:35:28 +0000 Commit: Mark Johnston CommitDate: 2021-09-14 12:50:53 +0000 libc: Use the initial-exec TLS model This permits more efficient accesses of thread-local variables, which are heavily used at least by jemalloc and locale-aware code. Note that on amd64 and i386, jemalloc's thread-local variables already have their TLS model overridden by defining JEMALLOC_TLS_MODEL. For now the change is applied only to tested platforms, but should in principle be enabled everywhere. PR: 255840 Suggested by: jrtc27 Reviewed by: kib Sponsored by: The FreeBSD Foundation (cherry picked from commit 9c97062b620137a1f7cad4c6b3fb030a396b3266) --- lib/libc/Makefile | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/lib/libc/Makefile b/lib/libc/Makefile index 958270e6ddf5..fdf6aa49932b 100644 --- a/lib/libc/Makefile +++ b/lib/libc/Makefile @@ -54,6 +54,13 @@ CANCELPOINTS_CFLAGS=-fexceptions CFLAGS+=${CANCELPOINTS_CFLAGS} .endif +# Use a more efficient TLS model for libc since we can reasonably assume that +# it will be loaded during program startup. +.if ${LIBC_ARCH} == "aarch64" || ${LIBC_ARCH} == "amd64" || \ + ${LIBC_ARCH} == "i386" || ${LIBC_ARCH} == "riscv" +CFLAGS+= -ftls-model=initial-exec +.endif + # # Link with static libcompiler_rt.a. #