From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932619AbbFUBLQ (ORCPT ); Sat, 20 Jun 2015 21:11:16 -0400 Received: from mail-lb0-f179.google.com ([209.85.217.179]:35515 "EHLO mail-lb0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932503AbbFUBLG (ORCPT ); Sat, 20 Jun 2015 21:11:06 -0400 From: Rasmus Villemoes To: Michal Marek Cc: linux-kbuild@vger.kernel.org, Rasmus Villemoes , linux-kernel@vger.kernel.org Subject: [RFC 1/4] scripts: add stackusage script Date: Sun, 21 Jun 2015 03:10:43 +0200 Message-Id: <1434849046-19920-2-git-send-email-linux@rasmusvillemoes.dk> X-Mailer: git-send-email 2.1.3 In-Reply-To: <1434849046-19920-1-git-send-email-linux@rasmusvillemoes.dk> References: <1434849046-19920-1-git-send-email-linux@rasmusvillemoes.dk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The current checkstack.pl script has a few problems, stemming from the overly simplistic attempt at parsing objdump output with regular expresions: For example, on x86_64 it doesn't take the push instruction into account, making it consistently underestimate the real stack use, and it also doesn't capture stack pointer adjustments of exactly 128 bytes [1]. Since newer gcc (>= 4.6) knows about -fstack-usage, we might as well take the information straight from the horse's mouth. This patch introduces scripts/stackusage, which is a simple wrapper for running make with EXTRA_CFLAGS set to -fstack-usage. Example use is scripts/stackusage -o out.su -- -j8 fs/ext4/ Arguments after -- are passed to make. Afterwards, we find all newly created .su files, massage them a little, sort by stack use and concatenate the result to a single output file. [1] Since gcc encodes that by 48 83 c4 80 add $0xffffffffffffff80,%rsp and not 48 81 ec 80 00 00 00 sub $0x80,%rsp since -128 fits in an imm8. Signed-off-by: Rasmus Villemoes --- scripts/stackusage | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100755 scripts/stackusage diff --git a/scripts/stackusage b/scripts/stackusage new file mode 100755 index 000000000000..d631af648ae7 --- /dev/null +++ b/scripts/stackusage @@ -0,0 +1,40 @@ +#!/bin/sh + +outfile="" +now=`date +%s` + +while [ $# -gt 0 ] +do + case "$1" in + -o) + outfile="$2" + echo "$outfile" + shift 2;; + -h) + echo "usage: $0 [-o outfile] -- " + exit 0;; + --) + shift + break;; + -*) + echo >&2 "usage: $0 [-o outfile] -- " + exit 1;; + *) break;; + esac +done + +if [ -z "$outfile" ] +then + outfile=`mktemp --tmpdir stackusage.$$.XXXX` +fi + +make EXTRA_CFLAGS="-fstack-usage" "$@" + +# Prepend directory name to file names, remove line/column +# information, make file/function/size/type properly tab-separated. +find . -name '*.su' -newermt "@${now}" -print | \ + xargs perl -MFile::Basename -pe \ + '$d = dirname($ARGV); s#([^:]+):([0-9]+:){2}#$d/$1\t#;' | \ + sort -k3,3nr > "${outfile}" + +echo "$0: output written to ${outfile}" -- 2.1.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/