From bdd1666b3d03d675bdb7f8d92b29f2797acbc5e8 Mon Sep 17 00:00:00 2001 From: Jin Yao Date: Sat, 16 Mar 2019 05:16:17 +0800 Subject: perf annotate: Remove hist__account_cycles() from callback The hist__account_cycles() function is executed when the hist_iter__branch_callback() is called. But it looks it's not necessary. In hist__account_cycles, it already walks on all branch entries. This patch moves the hist__account_cycles out of callback, now the data processing is much faster than before. Previous code has an issue that the ch[offset].num++ (in __symbol__account_cycles) is executed repeatedly since hist__account_cycles is called in each hist_iter__branch_callback, so the counting of ch[offset].num is not correct (too big). With this patch, the issue is fixed. And we don't need the code of "ch->reset >= ch->num / 2" to check if there are too many overlaps (in annotation__count_and_fill), otherwise some data would be hidden. Now, we can try, for example: perf record -b ... perf annotate or perf report -s symbol The before/after output should be no change. v3: --- Fix the crash in stdio mode. Like previous code, it needs the checking of ui__has_annotation() before hist__account_cycles() v2: --- 1. Cover the similar perf report 2. Remove the checking code "ch->reset >= ch->num / 2" Signed-off-by: Jin Yao Tested-by: Arnaldo Carvalho de Melo Cc: Alexander Shishkin Cc: Andi Kleen Cc: Jin Yao Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1552684577-29041-1-git-send-email-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-annotate.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'tools/perf/builtin-annotate.c') diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c index 67f9d9ffacfb..77deb3a40596 100644 --- a/tools/perf/builtin-annotate.c +++ b/tools/perf/builtin-annotate.c @@ -159,8 +159,6 @@ static int hist_iter__branch_callback(struct hist_entry_iter *iter, struct perf_evsel *evsel = iter->evsel; int err; - hist__account_cycles(sample->branch_stack, al, sample, false); - bi = he->branch_info; err = addr_map_symbol__inc_samples(&bi->from, sample, evsel); @@ -199,6 +197,8 @@ static int process_branch_callback(struct perf_evsel *evsel, if (a.map != NULL) a.map->dso->hit = 1; + hist__account_cycles(sample->branch_stack, al, sample, false); + ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann); return ret; } -- cgit v1.2.3