From 480accbb17609be01abcd09517605a930791bfdb Mon Sep 17 00:00:00 2001 From: Jin Yao Date: Fri, 9 Oct 2020 10:28:39 +0800 Subject: perf streams: Introduce branch history "streams" We define a stream as the branch history which is aggregated by the branch records from perf samples. For example, the callchains aggregated from the branch records are considered as streams. By browsing the hot stream, we can understand the hot code path. Now we only support the callchain for stream. For measuring the hot level for a stream, we use the callchain_node->hit, higher is hotter. There may be many callchains sampled so we only focus on the top N hottest callchains. N is a user defined parameter or predefined default value (nr_streams_max). This patch creates an evsel_streams array per event, and saves the top N hottest streams in a stream array. So now we can get the per-event top N hottest streams. Signed-off-by: Jin Yao Acked-by: Jiri Olsa Link: https://lore.kernel.org/r/20201009022845.13141-2-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/Build | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/perf/util/Build') diff --git a/tools/perf/util/Build b/tools/perf/util/Build index eebbd5223cae..e2563d0154eb 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -102,6 +102,7 @@ perf-y += rwsem.o perf-y += thread-stack.o perf-y += spark.o perf-y += topdown.o +perf-y += stream.o perf-$(CONFIG_AUXTRACE) += auxtrace.o perf-$(CONFIG_AUXTRACE) += intel-pt-decoder/ perf-$(CONFIG_AUXTRACE) += intel-pt.o -- cgit v1.2.3-59-g8ed1b