From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932865AbeCMMlN (ORCPT ); Tue, 13 Mar 2018 08:41:13 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:55266 "EHLO huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752448AbeCMMlL (ORCPT ); Tue, 13 Mar 2018 08:41:11 -0400 From: Yisheng Xie To: CC: , , , , , , , Yisheng Xie Subject: [PATCH v2 -perf/core 1/2] perf mmap: Discard head in overwrite_rb_find_range Date: Tue, 13 Mar 2018 20:31:13 +0800 Message-ID: <1520944274-37001-1-git-send-email-xieyisheng1@huawei.com> X-Mailer: git-send-email 1.7.12.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.102.37] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In overwrite mode, start will be set to head in perf_mmap__read_init. Therefore, it is no need to set the start one more in overwrite_rb_find_range and *start can be used as head instead of passing head to overwrite_rb_find_range. Signed-off-by: Yisheng Xie --- v2: - rebase to perf/core tools/perf/util/mmap.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c index 074c4fd..38ca3ff 100644 --- a/tools/perf/util/mmap.c +++ b/tools/perf/util/mmap.c @@ -199,19 +199,18 @@ int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd) return 0; } -static int overwrite_rb_find_range(void *buf, int mask, u64 head, u64 *start, u64 *end) +static int overwrite_rb_find_range(void *buf, int mask, u64 *start, u64 *end) { struct perf_event_header *pheader; - u64 evt_head = head; + u64 evt_head = *start; int size = mask + 1; - pr_debug2("overwrite_rb_find_range: buf=%p, head=%"PRIx64"\n", buf, head); - pheader = (struct perf_event_header *)(buf + (head & mask)); - *start = head; + pr_debug2("%s: buf=%p, start=%"PRIx64"\n", __func__, buf, *start); + pheader = (struct perf_event_header *)(buf + (*start & mask)); while (true) { - if (evt_head - head >= (unsigned int)size) { + if (evt_head - *start >= (unsigned int)size) { pr_debug("Finished reading overwrite ring buffer: rewind\n"); - if (evt_head - head > (unsigned int)size) + if (evt_head - *start > (unsigned int)size) evt_head -= pheader->size; *end = evt_head; return 0; @@ -262,7 +261,7 @@ int perf_mmap__read_init(struct perf_mmap *md) * Backward ring buffer is full. We still have a chance to read * most of data from it. */ - if (overwrite_rb_find_range(data, md->mask, head, &md->start, &md->end)) + if (overwrite_rb_find_range(data, md->mask, &md->start, &md->end)) return -EINVAL; } -- 1.7.12.4