linux-kernel - [PATCH v2 3/3] perf report: Bail out --mem-mode if mem info is not available

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Date:   Thu, 14 Nov 2019 18:52:13 +0530
From:   Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
To:     acme@...nel.org
Cc:     jolsa@...hat.com, kan.liang@...el.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        ak@...ux.intel.com, yao.jin@...ux.intel.com,
        linux-kernel@...r.kernel.org,
        Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Subject: [PATCH v2 3/3] perf report: Bail out --mem-mode if mem info is not available

If perf.data is recorded without -d, don't allow user to use
--mem-mode with perf report. symbol_daddr and phys_daddr can
be recorded separately and may be present in the perf.data but
at the report time they are associated with mem-mode fields and
thus this restriction applies to them as well.

Before:
  $ ./perf record ls
  $ ./perf report --mem-mode --stdio
  # Overhead  Local Weight  Memory access  Symbol                 
  # ........  ............  .............  .......................
      55.56%  0             N/A            [k] 0xffffffff81a00ae7 

After:
  $ ./perf report --mem-mode --stdio
  Error:
  Selected --mem-mode but no mem data. Did you call perf record without -d?

Suggested-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
---
 tools/perf/builtin-report.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index aae0e57c60fb..7c854d35c9ef 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -383,6 +383,14 @@ static int report__setup_sample_type(struct report *rep)
 		}
 	}
 
+	if (sort__mode == SORT_MODE__MEMORY) {
+		if (!is_pipe && !(sample_type & PERF_SAMPLE_DATA_SRC)) {
+			ui__error("Selected --mem-mode but no mem data. "
+				  "Did you call perf record without -d?\n");
+			return -1;
+		}
+	}
+
 	if (symbol_conf.use_callchain || symbol_conf.cumulate_callchain) {
 		if ((sample_type & PERF_SAMPLE_REGS_USER) &&
 		    (sample_type & PERF_SAMPLE_STACK_USER)) {
-- 
2.21.0