From patchwork Sat Feb 8 08:01:16 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andi Kleen X-Patchwork-Id: 3609541 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 2CE14BF418 for ; Sat, 8 Feb 2014 08:03:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 653142017E for ; Sat, 8 Feb 2014 08:03:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7BEDC20172 for ; Sat, 8 Feb 2014 08:03:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750891AbaBHIDf (ORCPT ); Sat, 8 Feb 2014 03:03:35 -0500 Received: from mga14.intel.com ([143.182.124.37]:2453 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751818AbaBHICO (ORCPT ); Sat, 8 Feb 2014 03:02:14 -0500 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by azsmga102.ch.intel.com with ESMTP; 08 Feb 2014 00:02:13 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.95,805,1384329600"; d="scan'208";a="471776754" Received: from laut.jf.intel.com (HELO localhost) ([10.23.232.94]) by fmsmga001.fm.intel.com with ESMTP; 08 Feb 2014 00:02:08 -0800 Received: by localhost (Postfix, from userid 1000) id 25750124ACD; Sat, 8 Feb 2014 09:01:29 +0100 (CET) From: Andi Kleen To: linux-kernel@vger.kernel.org Cc: linux-kbuild@vger.kernel.org, x86@kernel.org, Andi Kleen Subject: [PATCH 12/17] Kbuild, lto: Set TMPDIR for LTO Date: Sat, 8 Feb 2014 09:01:16 +0100 Message-Id: <1391846481-31491-12-git-send-email-ak@linux.intel.com> X-Mailer: git-send-email 1.8.5.2 In-Reply-To: <1391846481-31491-1-git-send-email-ak@linux.intel.com> References: <1391846481-31491-1-git-send-email-ak@linux.intel.com> Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Spam-Status: No, score=-7.4 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 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. Signed-off-by: Andi Kleen --- Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Makefile b/Makefile index 606ef7c..d1189ea 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.