From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaldo Carvalho de Melo Subject: [PATCH 06/14] perf mmap: Discard head in overwrite_rb_find_range() Date: Mon, 19 Mar 2018 16:01:28 -0300 Message-ID: <20180319190136.7441-7-acme@kernel.org> References: <20180319190136.7441-1-acme@kernel.org> Return-path: In-Reply-To: <20180319190136.7441-1-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Yisheng Xie , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Peter Zijlstra , Arnaldo Carvalho de Melo List-Id: linux-perf-users.vger.kernel.org From: Yisheng Xie In overwrite mode, start will be set to head in perf_mmap__read_init(). Therefore, there is no need to set the start one more time 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 Reviewed-by: Kan Liang Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1520944274-37001-1-git-send-email-xieyisheng1@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- 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 074c4fd3b67e..38ca3ffb9d61 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; } -- 2.14.3