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=-12.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,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 09B03ECE58D for ; Mon, 7 Oct 2019 12:54:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D0D5721721 for ; Mon, 7 Oct 2019 12:54:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570452869; bh=PbgVQdaY+wZyYuFB7JU0Y9deb8xzIRNbThtM+c6CG14=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Stf6XJ2kD2ya1bqRTmFe38nOE1PHNEAAvzAQ26uI8df49/hyiWR2Z0k7TwFqB2E5g Hc0jRdcUQyafcwgbmxjGTKVDYoD140wHV1tn2Fv4/ZtlBTJXj1Fja1MbohOzhEWFCl vW+OVnFr3GUEETYOCGIdcTjAPZr/B3KXkL8zgeqs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728307AbfJGMy2 (ORCPT ); Mon, 7 Oct 2019 08:54:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42582 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728273AbfJGMyZ (ORCPT ); Mon, 7 Oct 2019 08:54:25 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 27B2920FE; Mon, 7 Oct 2019 12:54:25 +0000 (UTC) Received: from krava.brq.redhat.com (unknown [10.43.17.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id F19EF5DC1E; Mon, 7 Oct 2019 12:54:22 +0000 (UTC) From: Jiri Olsa To: Arnaldo Carvalho de Melo Cc: lkml , Ingo Molnar , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Michael Petlan Subject: [PATCH 17/36] libperf: Add perf_evlist_mmap_ops::mmap callback Date: Mon, 7 Oct 2019 14:53:25 +0200 Message-Id: <20191007125344.14268-18-jolsa@kernel.org> In-Reply-To: <20191007125344.14268-1-jolsa@kernel.org> References: <20191007125344.14268-1-jolsa@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.71]); Mon, 07 Oct 2019 12:54:25 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Adding perf_evlist_mmap_ops::mmap callback to be called in mmap_per_evsel to actually mmap the map. Adding libperf's perf_evlist__mmap_cb_mmap function as libperf's mmap callback. New mmaped map gets refcount set to 2 in mmap__mmap, we follow that in mmap callback. We will move this to common place after we switch to perf_evlist__mmap. Link: http://lkml.kernel.org/n/tip-9cksnv3xbb1eset7ge67at4a@git.kernel.org Signed-off-by: Jiri Olsa --- tools/perf/lib/evlist.c | 29 +++++++++++++++++++++--- tools/perf/lib/include/internal/evlist.h | 3 +++ 2 files changed, 29 insertions(+), 3 deletions(-) diff --git a/tools/perf/lib/evlist.c b/tools/perf/lib/evlist.c index 4f49de5e8f7c..b69722627779 100644 --- a/tools/perf/lib/evlist.c +++ b/tools/perf/lib/evlist.c @@ -358,6 +358,28 @@ perf_evlist__mmap_cb_get(struct perf_evlist *evlist, bool overwrite, int idx) #define FD(e, x, y) (*(int *) xyarray__entry(e->fd, x, y)) +static int +perf_evlist__mmap_cb_mmap(struct perf_mmap *map, struct perf_mmap_param *mp, + int output, int cpu) +{ + /* + * The last one will be done at perf_mmap__consume(), so that we + * make sure we don't prevent tools from consuming every last event in + * the ring buffer. + * + * I.e. we can get the POLLHUP meaning that the fd doesn't exist + * anymore, but the last events for it are still in the ring buffer, + * waiting to be consumed. + * + * Tools can chose to ignore this at their own discretion, but the + * evlist layer can't just drop it when filtering events in + * perf_evlist__filter_pollfd(). + */ + refcount_set(&map->refcnt, 2); + + return perf_mmap__mmap(map, mp, output, cpu); +} + static int mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, int idx, struct perf_mmap_param *mp, int cpu_idx, @@ -396,7 +418,7 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops, if (*output == -1) { *output = fd; - if (perf_mmap__mmap(map, mp, *output, evlist_cpu) < 0) + if (ops->mmap(map, mp, *output, evlist_cpu) < 0) return -1; } else { if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0) @@ -488,7 +510,7 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist, const struct perf_cpu_map *cpus = evlist->cpus; const struct perf_thread_map *threads = evlist->threads; - if (!ops || !ops->get) + if (!ops || !ops->get || !ops->mmap) return -EINVAL; if (!evlist->mmap) @@ -513,7 +535,8 @@ int perf_evlist__mmap(struct perf_evlist *evlist, int pages) { struct perf_mmap_param mp; struct perf_evlist_mmap_ops ops = { - .get = perf_evlist__mmap_cb_get, + .get = perf_evlist__mmap_cb_get, + .mmap = perf_evlist__mmap_cb_mmap, }; evlist->mmap_len = (pages + 1) * page_size; diff --git a/tools/perf/lib/include/internal/evlist.h b/tools/perf/lib/include/internal/evlist.h index 9bc3a21643ea..b2019700cdc0 100644 --- a/tools/perf/lib/include/internal/evlist.h +++ b/tools/perf/lib/include/internal/evlist.h @@ -31,10 +31,13 @@ typedef void (*perf_evlist_mmap__cb_idx_t)(struct perf_evlist*, struct perf_mmap_param*, int, bool); typedef struct perf_mmap* (*perf_evlist_mmap__cb_get_t)(struct perf_evlist*, bool, int); +typedef int +(*perf_evlist_mmap__cb_mmap_t)(struct perf_mmap*, struct perf_mmap_param*, int, int); struct perf_evlist_mmap_ops { perf_evlist_mmap__cb_idx_t idx; perf_evlist_mmap__cb_get_t get; + perf_evlist_mmap__cb_mmap_t mmap; }; int perf_evlist__alloc_pollfd(struct perf_evlist *evlist); -- 2.21.0