From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-out.m-online.net (mail-out.m-online.net [IPv6:2001:a60:0:28:0:1:25:1]) by sourceware.org (Postfix) with ESMTPS id 049083850400 for ; Tue, 22 Jun 2021 20:18:31 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 049083850400 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=linux-m68k.org Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=nefkom.net Received: from frontend01.mail.m-online.net (unknown [192.168.8.182]) by mail-out.m-online.net (Postfix) with ESMTP id 4G8d516YXTz1s1Vn; Tue, 22 Jun 2021 22:18:29 +0200 (CEST) Received: from localhost (dynscan1.mnet-online.de [192.168.6.70]) by mail.m-online.net (Postfix) with ESMTP id 4G8d516Bfxz1qqkB; Tue, 22 Jun 2021 22:18:29 +0200 (CEST) X-Virus-Scanned: amavisd-new at mnet-online.de Received: from mail.mnet-online.de ([192.168.8.182]) by localhost (dynscan1.mail.m-online.net [192.168.6.70]) (amavisd-new, port 10024) with ESMTP id vEfrPgXfy8br; Tue, 22 Jun 2021 22:18:29 +0200 (CEST) X-Auth-Info: iwlrfviAAV/FoWTi6cJBWQCf0XKgzjg23uTonw+zED8i26atYBk5SP8iu87pnYIG Received: from igel.home (ppp-46-244-162-121.dynamic.mnet-online.de [46.244.162.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.mnet-online.de (Postfix) with ESMTPSA; Tue, 22 Jun 2021 22:18:29 +0200 (CEST) Received: by igel.home (Postfix, from userid 1000) id 8B3622C3719; Tue, 22 Jun 2021 22:18:28 +0200 (CEST) From: Andreas Schwab To: Adhemerval Zanella Cc: Adhemerval Zanella via Libc-alpha , Andrew Pinski , Rafael Eduardo Ruviaro Christ Subject: Re: aarch64 lacks HP_TIMING support in glibc References: <09ae1d8f-7b66-e9fc-5a98-3a002390c298@linaro.org> <87h7hpg0nb.fsf@igel.home> X-Yow: .. I don't understand the HUMOR of the THREE STOOGES!! Date: Tue, 22 Jun 2021 22:18:28 +0200 In-Reply-To: (Adhemerval Zanella's message of "Tue, 22 Jun 2021 16:53:44 -0300") Message-ID: <87czsdfyaz.fsf@igel.home> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-3.2 required=5.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2021 20:18:32 -0000 On Jun 22 2021, Adhemerval Zanella wrote: > On 22/06/2021 16:27, Andreas Schwab wrote: >> On Jun 22 2021, Adhemerval Zanella via Libc-alpha wrote: >> >>> It should be possible support hp-timing.h on aarch64 to use cntvct_el0 >>> if the minimum supported kernel also supports it (3.2). Afaik the >>> hp-timing will be used only for LD_DEBUG=statistics, so default usage >>> would not be penalized. >> >> But then, why is it such a big deal? > > Do you mean support hp-timing on aarch64 or eventually trap on kernel > on such usage? hp-timing in general. Andreas. -- Andreas Schwab, schwab@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."