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=-11.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 615E3C433E2 for ; Sun, 13 Sep 2020 21:03:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EEF07221F0 for ; Sun, 13 Sep 2020 21:03:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600031024; bh=Ejm0JzsDclPjD24gVlAEZ9HUisAzTrn2eJKIN0fro0s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rCRHNn5/8X7uKsvlf/XdH/NIhGwm9Da+u9tYLvA6oV0QJKWOIB/t9Fdjof7UKXrYp 6w54ywIUa4kX7JTdZDj34SMKA+ekN/Eh/HtZqu6k2cYVt4cr//s7RN+nfaWdKdv9Fz TdBBCDTjapfUuFeeBI8TKPNi1cYAIFoxfq3Fw9BE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725980AbgIMVDl convert rfc822-to-8bit (ORCPT ); Sun, 13 Sep 2020 17:03:41 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:44827 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725951AbgIMVDi (ORCPT ); Sun, 13 Sep 2020 17:03:38 -0400 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-157-oOEGkZPTOM-e36T6JUMgVg-1; Sun, 13 Sep 2020 17:03:29 -0400 X-MC-Unique: oOEGkZPTOM-e36T6JUMgVg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6BE6E801AAE; Sun, 13 Sep 2020 21:03:27 +0000 (UTC) Received: from krava.redhat.com (ovpn-112-4.ams2.redhat.com [10.36.112.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id 10B1410021AA; Sun, 13 Sep 2020 21:03:23 +0000 (UTC) From: Jiri Olsa To: Arnaldo Carvalho de Melo Cc: lkml , Peter Zijlstra , Ingo Molnar , Mark Rutland , Namhyung Kim , Alexander Shishkin , Michael Petlan , Song Liu , "Frank Ch. Eigler" , Ian Rogers , Stephane Eranian , Alexey Budankov , Andi Kleen , Adrian Hunter Subject: [PATCH 02/26] perf: Introduce mmap3 version of mmap event Date: Sun, 13 Sep 2020 23:02:49 +0200 Message-Id: <20200913210313.1985612-3-jolsa@kernel.org> In-Reply-To: <20200913210313.1985612-1-jolsa@kernel.org> References: <20200913210313.1985612-1-jolsa@kernel.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jolsa@kernel.org X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: kernel.org Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add new version of mmap event. The MMAP3 record is an augmented version of MMAP2, it adds build id value to identify the exact binary object behind memory map: struct { struct perf_event_header header; u32 pid, tid; u64 addr; u64 len; u64 pgoff; u32 maj; u32 min; u64 ino; u64 ino_generation; u32 prot, flags; u32 reserved; u8 buildid[20]; char filename[]; struct sample_id sample_id; }; Adding 4 bytes reserved field to align buildid data to 8 bytes, so sample_id data is properly aligned. The mmap3 event is enabled by new mmap3 bit in perf_event_attr struct. When set for an event, it enables the build id retrieval and will use mmap3 format for the event. Keeping track of mmap3 events and calling build_id_parse in perf_event_mmap_event only if we have any defined. Having build id attached directly to the mmap event will help tool like perf to skip final search through perf data for binaries that are needed in the report time. Also it prevents possible race when the binary could be removed or replaced during profiling. Signed-off-by: Jiri Olsa --- include/uapi/linux/perf_event.h | 27 ++++++++++++++++++++++- kernel/events/core.c | 38 +++++++++++++++++++++++++++------ 2 files changed, 57 insertions(+), 8 deletions(-) diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 077e7ee69e3d..facfc3c673ed 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -384,7 +384,8 @@ struct perf_event_attr { aux_output : 1, /* generate AUX records instead of events */ cgroup : 1, /* include cgroup events */ text_poke : 1, /* include text poke events */ - __reserved_1 : 30; + mmap3 : 1, /* include bpf events */ + __reserved_1 : 29; union { __u32 wakeup_events; /* wakeup every n events */ @@ -1060,6 +1061,30 @@ enum perf_event_type { */ PERF_RECORD_TEXT_POKE = 20, + /* + * The MMAP3 records are an augmented version of MMAP2, they add + * build id value to identify the exact binary behind map + * + * struct { + * struct perf_event_header header; + * + * u32 pid, tid; + * u64 addr; + * u64 len; + * u64 pgoff; + * u32 maj; + * u32 min; + * u64 ino; + * u64 ino_generation; + * u32 prot, flags; + * u32 reserved; + * u8 buildid[20]; + * char filename[]; + * struct sample_id sample_id; + * }; + */ + PERF_RECORD_MMAP3 = 21, + PERF_RECORD_MAX, /* non-ABI */ }; diff --git a/kernel/events/core.c b/kernel/events/core.c index 7ed5248f0445..719894492dac 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -51,6 +51,7 @@ #include #include #include +#include #include "internal.h" @@ -386,6 +387,7 @@ static DEFINE_PER_CPU(int, perf_sched_cb_usages); static DEFINE_PER_CPU(struct pmu_event_list, pmu_sb_events); static atomic_t nr_mmap_events __read_mostly; +static atomic_t nr_mmap3_events __read_mostly; static atomic_t nr_comm_events __read_mostly; static atomic_t nr_namespaces_events __read_mostly; static atomic_t nr_task_events __read_mostly; @@ -4588,7 +4590,7 @@ static bool is_sb_event(struct perf_event *event) return false; if (attr->mmap || attr->mmap_data || attr->mmap2 || - attr->comm || attr->comm_exec || + attr->mmap3 || attr->comm || attr->comm_exec || attr->task || attr->ksymbol || attr->context_switch || attr->text_poke || attr->bpf_event) @@ -4644,6 +4646,8 @@ static void unaccount_event(struct perf_event *event) dec = true; if (event->attr.mmap || event->attr.mmap_data) atomic_dec(&nr_mmap_events); + if (event->attr.mmap3) + atomic_dec(&nr_mmap3_events); if (event->attr.comm) atomic_dec(&nr_comm_events); if (event->attr.namespaces) @@ -7465,7 +7469,7 @@ static void perf_pmu_output_stop(struct perf_event *event) /* * task tracking -- fork/exit * - * enabled by: attr.comm | attr.mmap | attr.mmap2 | attr.mmap_data | attr.task + * enabled by: attr.comm | attr.mmap | attr.mmap2 | attr.mmap3 | attr.mmap_data | attr.task */ struct perf_task_event { @@ -7486,8 +7490,8 @@ struct perf_task_event { static int perf_event_task_match(struct perf_event *event) { return event->attr.comm || event->attr.mmap || - event->attr.mmap2 || event->attr.mmap_data || - event->attr.task; + event->attr.mmap2 || event->attr.mmap3 || + event->attr.mmap_data || event->attr.task; } static void perf_event_task_output(struct perf_event *event, @@ -7913,6 +7917,7 @@ struct perf_mmap_event { u64 ino; u64 ino_generation; u32 prot, flags; + u8 buildid[BUILD_ID_SIZE]; struct { struct perf_event_header header; @@ -7933,7 +7938,7 @@ static int perf_event_mmap_match(struct perf_event *event, int executable = vma->vm_flags & VM_EXEC; return (!executable && event->attr.mmap_data) || - (executable && (event->attr.mmap || event->attr.mmap2)); + (executable && (event->attr.mmap || event->attr.mmap2 || event->attr.mmap3)); } static void perf_event_mmap_output(struct perf_event *event, @@ -7949,7 +7954,7 @@ static void perf_event_mmap_output(struct perf_event *event, if (!perf_event_mmap_match(event, data)) return; - if (event->attr.mmap2) { + if (event->attr.mmap2 || event->attr.mmap3) { mmap_event->event_id.header.type = PERF_RECORD_MMAP2; mmap_event->event_id.header.size += sizeof(mmap_event->maj); mmap_event->event_id.header.size += sizeof(mmap_event->min); @@ -7959,6 +7964,12 @@ static void perf_event_mmap_output(struct perf_event *event, mmap_event->event_id.header.size += sizeof(mmap_event->flags); } + if (event->attr.mmap3) { + mmap_event->event_id.header.type = PERF_RECORD_MMAP3; + mmap_event->event_id.header.size += sizeof(u32); + mmap_event->event_id.header.size += sizeof(mmap_event->buildid); + } + perf_event_header__init_id(&mmap_event->event_id.header, &sample, event); ret = perf_output_begin(&handle, event, mmap_event->event_id.header.size); @@ -7970,7 +7981,7 @@ static void perf_event_mmap_output(struct perf_event *event, perf_output_put(&handle, mmap_event->event_id); - if (event->attr.mmap2) { + if (event->attr.mmap2 || event->attr.mmap3) { perf_output_put(&handle, mmap_event->maj); perf_output_put(&handle, mmap_event->min); perf_output_put(&handle, mmap_event->ino); @@ -7979,6 +7990,13 @@ static void perf_event_mmap_output(struct perf_event *event, perf_output_put(&handle, mmap_event->flags); } + if (event->attr.mmap3) { + u32 reserved = 0; + + perf_output_put(&handle, reserved); + __output_copy(&handle, mmap_event->buildid, BUILD_ID_SIZE); + } + __output_copy(&handle, mmap_event->file_name, mmap_event->file_size); @@ -8098,6 +8116,9 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event) mmap_event->prot = prot; mmap_event->flags = flags; + if (atomic_read(&nr_mmap3_events)) + build_id_parse(vma, mmap_event->buildid); + if (!(vma->vm_flags & VM_EXEC)) mmap_event->event_id.header.misc |= PERF_RECORD_MISC_MMAP_DATA; @@ -8241,6 +8262,7 @@ void perf_event_mmap(struct vm_area_struct *vma) /* .ino_generation (attr_mmap2 only) */ /* .prot (attr_mmap2 only) */ /* .flags (attr_mmap2 only) */ + /* .buildid (attr_mmap3 only) */ }; perf_addr_filters_adjust(vma); @@ -11040,6 +11062,8 @@ static void account_event(struct perf_event *event) inc = true; if (event->attr.mmap || event->attr.mmap_data) atomic_inc(&nr_mmap_events); + if (event->attr.mmap3) + atomic_inc(&nr_mmap3_events); if (event->attr.comm) atomic_inc(&nr_comm_events); if (event->attr.namespaces) -- 2.26.2