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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 423B5C6FD1F for ; Wed, 8 Mar 2023 12:22:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231210AbjCHMWc (ORCPT ); Wed, 8 Mar 2023 07:22:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231379AbjCHMWR (ORCPT ); Wed, 8 Mar 2023 07:22:17 -0500 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 014BCBF380 for ; Wed, 8 Mar 2023 04:21:37 -0800 (PST) Received: by mail-wr1-x431.google.com with SMTP id h11so15162071wrm.5 for ; Wed, 08 Mar 2023 04:21:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isovalent.com; s=google; t=1678278082; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=c+hxF791sh3V+bY9edrxSKeJWX6rquUOGNLsOKsa+zc=; b=dzPp/WmNjwr7dsN5wn2+zmfR6VxFygdUomBTD4eb/alacv1Pj9VrzTq62Us+B+EHmv xvimX6Z087eJowCYWsUmzwc05pJUmQ2/NwD2EZO3vmbxTn6WvSbb3+6ce9HbW2aNrlY4 B0LaDOeTUpTb9W/g6BBw+vd4CKEqAEmo8Hz1qwmlmyY6kqaPXWhNy7v52KpoGD89GKeD dDEAQZBeEChvqrxFhrL78vkwDlDk9BtLvRWv+H4cwrSJPDmbXLBEJmQjlqgQEQkDG6g/ eWqTs585DGehfUUfP/TwPaVozfidkUmLCT/kpmbXrqvVwdj9Pnf/BlLiqusrMbN8M+NF 9CyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1678278082; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=c+hxF791sh3V+bY9edrxSKeJWX6rquUOGNLsOKsa+zc=; b=fqsAX0v8z/qxUO5UYO4i0IRqMmDs0OO2NZB52GZQPbIx1ohXSXT6eSd2q8SuNcFj9w AC9qUVRDxqP/0HEhRbBSPVZ/F062TtH+CBUciZs5HVLT4wAf6Ui370r34PR9XDQmr++W SE78+QvRkrZt9kR0alyJ/zhoI3RyFIfaR9/f5YQqNfniHq4NQLEU23tTq1KpDxGWSs+q OyFiGnUULw1nTxCa+NUfOtVMAEGEI1dl31hE+FENfUOwYlwNOLlvf5K4h8yPghCUeTTN 3B0Ftulx9dd9kUFKjZI2dM9T8Ry0+ceIOtzQhHc0MG+KUu+U/uKCQb0bUMbf3BQcn96E zv2g== X-Gm-Message-State: AO0yUKVRGbtZXhhVNAWQrhIWH1Hx8p4vXNuViAP8cIqOu82K5NHq3bxX IkYGFCN6Su+AYAwpkyRHEuy8wiNJGjIfg60YgNcGow== X-Google-Smtp-Source: AK7set9TIaW1fTZS8vm70GUIiNtqM+rejZQoeVbd8i+NZH2W+095Vv0S01nA1lwNVre04gWGkncyrw== X-Received: by 2002:a5d:4445:0:b0:2c8:a6ea:c00c with SMTP id x5-20020a5d4445000000b002c8a6eac00cmr11742031wrr.69.1678278081806; Wed, 08 Mar 2023 04:21:21 -0800 (PST) Received: from tpx1.lan (f.c.7.0.0.0.0.0.0.0.0.0.0.0.0.0.f.f.6.2.a.5.a.7.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:7a5a:26ff::7cf]) by smtp.gmail.com with ESMTPSA id f2-20020a5d58e2000000b002c56af32e8csm15186498wrd.35.2023.03.08.04.21.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Mar 2023 04:21:21 -0800 (PST) From: Lorenz Bauer To: peterz@infradead.org Cc: Lorenz Bauer , Daniel Xu , bpf@vger.kernel.org Subject: Re: [PATCH bpf-next 1/5] perf/core: Add PERF_FORMAT_LOST read_format Date: Wed, 8 Mar 2023 12:20:57 +0000 Message-Id: <20230308122057.539055-1-lmb@isovalent.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20191028091229.GJ4131@hirez.programming.kicks-ass.net> References: <20191028091229.GJ4131@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Hi Peter, On Mon, 28 Oct 2019 10:12:29 +0100 you wrote: > But now that I wrote it, I'm a little scared of what I had to do for > __perf_sw_event(). Let me ponder that a little bit more. Do you have an idea how to resolve this? For context, I maintain a Go library that interacts with perf_events for the purpose of attaching eBPF kprobes. Users keep asking for an explicit tracefs fallback since the miss counter is so valuable to them. It'd be great to find a solution! Best Lorenz