From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id E856D3858D28 for ; Wed, 15 Dec 2021 21:33:53 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org E856D3858D28 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-426-qIbjYC9LMKKteaHmHN7zVA-1; Wed, 15 Dec 2021 16:33:50 -0500 X-MC-Unique: qIbjYC9LMKKteaHmHN7zVA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 74540185302A; Wed, 15 Dec 2021 21:33:49 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.17.223]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 662795BD29; Wed, 15 Dec 2021 21:33:48 +0000 (UTC) From: Florian Weimer To: "Miller, Tim" Cc: "Miller, Tim via Libc-help" Subject: Re: Build glibc for aarch64 with C-only versions of memcpy? References: <52DC392C-C51F-41DF-9120-574221C873A8@amazon.com> <87lf0lppnw.fsf@oldenburg.str.redhat.com> Date: Wed, 15 Dec 2021 22:33:46 +0100 In-Reply-To: (Tim Miller's message of "Wed, 15 Dec 2021 21:28:04 +0000") Message-ID: <87h7b9pn7p.fsf@oldenburg.str.redhat.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain X-Spam-Status: No, score=-6.5 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-help@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-help mailing list List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 15 Dec 2021 21:33:55 -0000 * Tim Miller: > Are you referring to the LBR mode that perf supports? Not just that. There are other call graph modes. For example, you could use a distribution that builds everything with DWARF unwinding data, and use DWARF unwinding. > Well, I tried that, but it keeps stopping at that breakpoint over and > over again. I do get a stack trace, but what I need to find out is who > is calling it MOST. Don't set a breakpoint. Just hit ^C from time to time to see if you can hit the function. But at 3% to 4%, this isn't going to work or is very tedious. Thanks, Florian