linux-kernel - [PATCH v2 1/5] perf stat: Revert "perf stat: Add default hybrid events"

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Date:   Thu,  9 Jun 2022 22:53:10 +0800
From:   zhengjun.xing@...ux.intel.com
To:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...el.com, jolsa@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        irogers@...gle.com, adrian.hunter@...el.com, ak@...ux.intel.com,
        kan.liang@...ux.intel.com, zhengjun.xing@...ux.intel.com
Subject: [PATCH v2 1/5] perf stat: Revert "perf stat: Add default hybrid events"

From: Kan Liang <kan.liang@...ux.intel.com>

This reverts commit ac2dc29edd21 ("perf stat: Add default hybrid
events").

Between this patch and the reverted patch, the commit 6c1912898ed2
("perf parse-events: Rename parse_events_error functions") and the
commit 07eafd4e053a ("perf parse-event: Add init and exit to
parse_event_error") clean up the parse_events_error_*() codes. The
related change is also reverted.

The reverted patch is hard to be extended to support new default
events, e.g., Topdown events, and the existing "--detailed" option
on a hybrid platform.

A new solution will be proposed in the following patch to enable the
perf stat default on a hybrid platform.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
---
Change log:
  v2:
    * no change since v1.

 tools/perf/builtin-stat.c | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 4ce87a8eb7d7..6ac79d95f3b5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1685,12 +1685,6 @@ static int add_default_attributes(void)
   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS	},
   { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES		},
 
-};
-	struct perf_event_attr default_sw_attrs[] = {
-  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK		},
-  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES	},
-  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS		},
-  { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS		},
 };
 
 /*
@@ -1947,30 +1941,6 @@ static int add_default_attributes(void)
 	}
 
 	if (!evsel_list->core.nr_entries) {
-		if (perf_pmu__has_hybrid()) {
-			struct parse_events_error errinfo;
-			const char *hybrid_str = "cycles,instructions,branches,branch-misses";
-
-			if (target__has_cpu(&target))
-				default_sw_attrs[0].config = PERF_COUNT_SW_CPU_CLOCK;
-
-			if (evlist__add_default_attrs(evsel_list,
-						      default_sw_attrs) < 0) {
-				return -1;
-			}
-
-			parse_events_error__init(&errinfo);
-			err = parse_events(evsel_list, hybrid_str, &errinfo);
-			if (err) {
-				fprintf(stderr,
-					"Cannot set up hybrid events %s: %d\n",
-					hybrid_str, err);
-				parse_events_error__print(&errinfo, hybrid_str);
-			}
-			parse_events_error__exit(&errinfo);
-			return err ? -1 : 0;
-		}
-
 		if (target__has_cpu(&target))
 			default_attrs0[0].config = PERF_COUNT_SW_CPU_CLOCK;
 
-- 
2.25.1