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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 44ECCC433E0 for ; Tue, 26 Jan 2021 14:44:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0CF39207A0 for ; Tue, 26 Jan 2021 14:44:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391504AbhAZOnz (ORCPT ); Tue, 26 Jan 2021 09:43:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48410 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391470AbhAZOnf (ORCPT ); Tue, 26 Jan 2021 09:43:35 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F1F48C0611BD for ; Tue, 26 Jan 2021 06:42:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=w9gTsMMOQz39o3Kzc+ONyPjwXCQ2Mzuei9mghrZLPVk=; b=1WKy1gRNY1V2JS8HwV9fvPZlDU 4zTOZlGJyeTu0on2qPqaY3LdtYPTcZt9sSrHuigiAJdzsQPJCNATOHTCogqqUpqtW9LcEUJYVSeUb FyYu85I0LfyOUMpWAEwFSYI+YfUlA6n0E8QIRKVU8e9HpsNgM7vjoe5q7hXLIgt1vY5t0vln83MSH /Mt7OGMRfmZJJ2QW5Bs07F1Ph+BLzEKcwvixDeFJaQwgWhj+ygUDJXsSvmJHN2obJDy+/yJ40Ihli 3YWriWE/n+0DPz2S5rDjUmhlP5KduPZlYZLTdQSVNDvLZ9WyN6sskQwNZE7DWfguWtiL1cyzsQKcm 4MDJ84Ig==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1l4PYO-0005Qs-9c; Tue, 26 Jan 2021 14:42:48 +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 BEB5C300DB4; Tue, 26 Jan 2021 15:42:43 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A500B2029059B; Tue, 26 Jan 2021 15:42:43 +0100 (CET) Date: Tue, 26 Jan 2021 15:42:43 +0100 From: Peter Zijlstra To: kan.liang@linux.intel.com Cc: acme@kernel.org, mingo@kernel.org, linux-kernel@vger.kernel.org, eranian@google.com, namhyung@kernel.org, jolsa@redhat.com, ak@linux.intel.com, yao.jin@linux.intel.com Subject: Re: [PATCH 01/12] perf/core: Add PERF_SAMPLE_WEIGHT_EXT Message-ID: References: <1611088711-17177-1-git-send-email-kan.liang@linux.intel.com> <1611088711-17177-2-git-send-email-kan.liang@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1611088711-17177-2-git-send-email-kan.liang@linux.intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jan 19, 2021 at 12:38:20PM -0800, kan.liang@linux.intel.com wrote: > @@ -900,6 +901,13 @@ enum perf_event_type { > * char data[size]; } && PERF_SAMPLE_AUX > * { u64 data_page_size;} && PERF_SAMPLE_DATA_PAGE_SIZE > * { u64 code_page_size;} && PERF_SAMPLE_CODE_PAGE_SIZE > + * { union { > + * u64 weight_ext; > + * struct { > + * u64 instr_latency:16, > + * reserved:48; > + * }; > + * } && PERF_SAMPLE_WEIGHT_EXT > * }; > */ > PERF_RECORD_SAMPLE = 9, > @@ -1248,4 +1256,12 @@ struct perf_branch_entry { > reserved:40; > }; > > +union perf_weight_ext { > + __u64 val; > + struct { > + __u64 instr_latency:16, > + reserved:48; > + }; > +}; > + > #endif /* _UAPI_LINUX_PERF_EVENT_H */ > diff --git a/kernel/events/core.c b/kernel/events/core.c > index 55d1879..9363d12 100644 > --- a/kernel/events/core.c > +++ b/kernel/events/core.c > @@ -1903,6 +1903,9 @@ static void __perf_event_header_size(struct perf_event *event, u64 sample_type) > if (sample_type & PERF_SAMPLE_CODE_PAGE_SIZE) > size += sizeof(data->code_page_size); > > + if (sample_type & PERF_SAMPLE_WEIGHT_EXT) > + size += sizeof(data->weight_ext); > + > event->header_size = size; > } > > @@ -6952,6 +6955,9 @@ void perf_output_sample(struct perf_output_handle *handle, > perf_aux_sample_output(event, handle, data); > } > > + if (sample_type & PERF_SAMPLE_WEIGHT_EXT) > + perf_output_put(handle, data->weight_ext); > + > if (!event->attr.watermark) { > int wakeup_events = event->attr.wakeup_events; > This patch is broken and will expose uninitialized kernel stack.