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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3FFBBC433F5 for ; Wed, 29 Sep 2021 08:42:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22BAD613D0 for ; Wed, 29 Sep 2021 08:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244882AbhI2In7 (ORCPT ); Wed, 29 Sep 2021 04:43:59 -0400 Received: from mga07.intel.com ([134.134.136.100]:13702 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244750AbhI2In4 (ORCPT ); Wed, 29 Sep 2021 04:43:56 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10121"; a="288550397" X-IronPort-AV: E=Sophos;i="5.85,331,1624345200"; d="scan'208";a="288550397" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Sep 2021 01:42:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.85,331,1624345200"; d="scan'208";a="520757395" Received: from nntpat99-84.inn.intel.com ([10.125.99.84]) by orsmga001.jf.intel.com with ESMTP; 29 Sep 2021 01:42:12 -0700 From: Alexey Bayduraev To: Arnaldo Carvalho de Melo Cc: Jiri Olsa , Namhyung Kim , Alexander Shishkin , Peter Zijlstra , Ingo Molnar , linux-kernel , Andi Kleen , Adrian Hunter , Alexander Antonov , Alexei Budankov , Riccardo Mancini Subject: [PATCH 5/6] perf session: Move map/unmap into reader__mmap function Date: Wed, 29 Sep 2021 11:41:53 +0300 Message-Id: <212fc917cbc0c26da042c3571c67bf0f4696aba8.1632900802.git.alexey.v.bayduraev@linux.intel.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Moving mapping and unmapping code into reader__mmap, so the mmap code is located together. Moving head/file_offset computation into reader__mmap function, so all the offset computation is located together and in one place only. Suggested-by: Jiri Olsa Acked-by: Namhyung Kim Reviewed-by: Riccardo Mancini Tested-by: Riccardo Mancini Signed-off-by: Alexey Bayduraev --- tools/perf/util/session.c | 60 +++++++++++++++++++++++---------------- 1 file changed, 35 insertions(+), 25 deletions(-) diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 85142d2a9a5a..5e08def72b41 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -2206,12 +2206,9 @@ static int reader__init(struct reader *rd, bool *one_mmap) { struct reader_state *st = &rd->state; - u64 page_offset; char **mmaps = st->mmaps; - page_offset = page_size * (rd->data_offset / page_size); - st->file_offset = page_offset; - st->head = rd->data_offset - page_offset; + st->head = rd->data_offset; st->data_size = rd->data_size + rd->data_offset; @@ -2238,15 +2235,12 @@ reader__exit(struct reader *rd) } static int -reader__process_events(struct reader *rd, struct perf_session *session, - struct ui_progress *prog) +reader__mmap(struct reader *rd, struct perf_session *session) { struct reader_state *st = &rd->state; - u64 page_offset, size; - int err = 0, mmap_prot, mmap_flags; + int mmap_prot, mmap_flags; char *buf, **mmaps = st->mmaps; - union perf_event *event; - s64 skip; + u64 page_offset; mmap_prot = PROT_READ; mmap_flags = MAP_SHARED; @@ -2257,20 +2251,45 @@ reader__process_events(struct reader *rd, struct perf_session *session, mmap_prot |= PROT_WRITE; mmap_flags = MAP_PRIVATE; } -remap: + + if (mmaps[st->mmap_idx]) { + munmap(mmaps[st->mmap_idx], st->mmap_size); + mmaps[st->mmap_idx] = NULL; + } + + page_offset = page_size * (st->head / page_size); + st->file_offset += page_offset; + st->head -= page_offset; + buf = mmap(NULL, st->mmap_size, mmap_prot, mmap_flags, rd->fd, st->file_offset); if (buf == MAP_FAILED) { pr_err("failed to mmap file\n"); - err = -errno; - goto out; + return -errno; } mmaps[st->mmap_idx] = st->mmap_cur = buf; st->mmap_idx = (st->mmap_idx + 1) & (ARRAY_SIZE(st->mmaps) - 1); st->file_pos = st->file_offset + st->head; + return 0; +} + +static int +reader__process_events(struct reader *rd, struct perf_session *session, + struct ui_progress *prog) +{ + struct reader_state *st = &rd->state; + u64 size; + int err = 0; + union perf_event *event; + s64 skip; + +remap: + err = reader__mmap(rd, session); + if (err) + goto out; if (session->one_mmap) { - session->one_mmap_addr = buf; - session->one_mmap_offset = st->file_offset; + session->one_mmap_addr = rd->state.mmap_cur; + session->one_mmap_offset = rd->state.file_offset; } more: @@ -2279,17 +2298,8 @@ reader__process_events(struct reader *rd, struct perf_session *session, if (IS_ERR(event)) return PTR_ERR(event); - if (!event) { - if (mmaps[st->mmap_idx]) { - munmap(mmaps[st->mmap_idx], st->mmap_size); - mmaps[st->mmap_idx] = NULL; - } - - page_offset = page_size * (st->head / page_size); - st->file_offset += page_offset; - st->head -= page_offset; + if (!event) goto remap; - } session->active_reader = rd; size = event->header.size; -- 2.19.0