From patchwork Tue Feb 18 14:28:51 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andi Kleen X-Patchwork-Id: 3671511 Return-Path: X-Original-To: patchwork-linux-kbuild@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 98A00BF13A for ; Tue, 18 Feb 2014 14:36:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C197A20213 for ; Tue, 18 Feb 2014 14:35:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E23232020F for ; Tue, 18 Feb 2014 14:35:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755364AbaBROfR (ORCPT ); Tue, 18 Feb 2014 09:35:17 -0500 Received: from mga02.intel.com ([134.134.136.20]:5554 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755882AbaBRO3v (ORCPT ); Tue, 18 Feb 2014 09:29:51 -0500 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga101.jf.intel.com with ESMTP; 18 Feb 2014 06:29:50 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,502,1389772800"; d="scan'208";a="457420321" Received: from laut.jf.intel.com (HELO localhost) ([10.23.232.94]) by orsmga001.jf.intel.com with ESMTP; 18 Feb 2014 06:29:50 -0800 Received: by localhost (Postfix, from userid 1000) id 448471249CB; Tue, 18 Feb 2014 15:29:10 +0100 (CET) From: Andi Kleen To: linux-kernel@vger.kernel.org Cc: sam@ravnborg.org, x86@kernel.org, linux-kbuild@vger.kernel.org, Andi Kleen Subject: [PATCH 13/20] Kbuild, lto: Set TMPDIR for LTO v2 Date: Tue, 18 Feb 2014 15:28:51 +0100 Message-Id: <1392733738-8290-14-git-send-email-andi@firstfloor.org> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1392733738-8290-1-git-send-email-andi@firstfloor.org> References: <1392733738-8290-1-git-send-email-andi@firstfloor.org> Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Andi Kleen LTO gcc puts a lot of data into $TMPDIR, essentially another copy of the object directory to pass the repartitioned object files to the code generation processes. TMPDIR defaults to /tmp With /tmp as tmpfs it's easy to drive systems to out of memory, because they will compete with the already high anonymous memory consumption of the wpa LTO pass. When LTO is set always set TMPDIR to the object directory. This could be slightly slower, but is far safer and eliminates another parameter the LTO user would need to set manually. I made it conditional on LTO for now. v2: Allow user to override (H. Peter Anvin) Signed-off-by: Andi Kleen --- Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Makefile b/Makefile index 893d6f0..0fd460b 100644 --- a/Makefile +++ b/Makefile @@ -407,6 +407,14 @@ export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL export KBUILD_ARFLAGS +ifdef CONFIG_LTO +# LTO gcc creates a lot of files in TMPDIR, and with /tmp as tmpfs +# it's easy to drive the machine OOM. Use the object directory +# instead +TMPDIR ?= ${objtree} +export TMPDIR +endif + # When compiling out-of-tree modules, put MODVERDIR in the module # tree rather than in the kernel tree. The kernel tree might # even be read-only.