From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E33DCC43331 for ; Tue, 24 Mar 2020 16:12:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AED56208DB for ; Tue, 24 Mar 2020 16:12:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="lmBofkxC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728864AbgCXQMO (ORCPT ); Tue, 24 Mar 2020 12:12:14 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:51026 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728525AbgCXQLi (ORCPT ); Tue, 24 Mar 2020 12:11:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-Id:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=6kFko+tI6uqSmZzN+BrRSaiCqmG948MnieaRkmvxg98=; b=lmBofkxCzWiu3BuMbsxoEnRMfP cd3OnN06Ctki0Qme0rOGbVyLVxdE9EP3JlarY89z7bOujPmNV40tZLnEZlVbygmZLqx2Yju7un+eC DZjIa2F+AgIVevlRvWckdis8FK3GPOJ3NigMEeODD37tiKYthOHXBoif0Ld6WY+2AoNQnwIJKnPYm mnR8yD57SCilS9OY5Xg6U82Ei2aiA7PqzxhpC/K8vj0C/ZgHC/JM+i7MzdokgK6yLtLybq0fRpILJ TvZISB7ap+PuAfsZLNnlU3enydXafxqmVi2xBY47qDaNBkmze2mlQ3ZVyzG5Sx2hqVoRFdexxDozg +GaYgSEA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jGm9N-0000CM-EG; Tue, 24 Mar 2020 16:11:33 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 6E7833075C0; Tue, 24 Mar 2020 17:11:28 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id 6278B29A490FA; Tue, 24 Mar 2020 17:11:28 +0100 (CET) Message-Id: <20200324160925.168274291@infradead.org> User-Agent: quilt/0.65 Date: Tue, 24 Mar 2020 16:31:34 +0100 From: Peter Zijlstra To: tglx@linutronix.de, jpoimboe@redhat.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org, peterz@infradead.org, mhiramat@kernel.org, mbenes@suse.cz, brgerst@gmail.com Subject: [PATCH v3 21/26] objtool: Use sec_offset_hash() for insn_hash References: <20200324153113.098167666@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In preparation for find_insn_containing(), change insn_hash to use sec_offset_hash(). This actually reduces runtime; probably because mixing in the section index reduces the collisions due to text sections all starting their instructions at offset 0. Runtime on vmlinux.o from 3.1 to 2.5 seconds. Signed-off-by: Peter Zijlstra (Intel) Acked-by: Josh Poimboeuf --- tools/objtool/check.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -34,9 +34,10 @@ struct instruction *find_insn(struct obj { struct instruction *insn; - hash_for_each_possible(file->insn_hash, insn, hash, offset) + hash_for_each_possible(file->insn_hash, insn, hash, sec_offset_hash(sec, offset)) { if (insn->sec == sec && insn->offset == offset) return insn; + } return NULL; } @@ -276,7 +277,7 @@ static int decode_instructions(struct ob if (ret) goto err; - hash_add(file->insn_hash, &insn->hash, insn->offset); + hash_add(file->insn_hash, &insn->hash, sec_offset_hash(sec, insn->offset)); list_add_tail(&insn->list, &file->insn_list); nr_insns++; }