[PATCH v8 1/3] perf report: compile tips.txt in perf binary

* [PATCH v8 1/3] perf report: compile tips.txt in perf binary
@ 2021-05-24 11:15 Denys Zagorui
  2021-05-24 11:15 ` [PATCH v8 2/3] perf tests: avoid storing an absolute path " Denys Zagorui
                   ` (4 more replies)
  0 siblings, 5 replies; 10+ messages in thread
From: Denys Zagorui @ 2021-05-24 11:15 UTC (permalink / raw)
  To: jolsa, linux-kernel, peterz, mingo, acme, mark.rutland,
	alexander.shishkin, namhyung

It seems there is some need to have an ability to invoke perf from
build directory without installation
(84cfac7f05e1: perf tools: Set and pass DOCDIR to builtin-report.c)
DOCDIR definition contains an absolute path to kernel source directory.
It is build machine related info and it makes perf binary unreproducible.

This can be avoided by compiling tips.txt in perf directly.

Signed-off-by: Denys Zagorui <dzagorui@cisco.com>
---
 tools/perf/Build               |  2 +-
 tools/perf/Documentation/Build |  9 +++++++++
 tools/perf/builtin-report.c    | 34 +++++++++++++++++++++++++---------
 tools/perf/util/util.c         | 28 ----------------------------
 tools/perf/util/util.h         |  2 --
 5 files changed, 35 insertions(+), 40 deletions(-)
 create mode 100644 tools/perf/Documentation/Build

diff --git a/tools/perf/Build b/tools/perf/Build
index db61dbe2b543..3a2e768d7576 100644
--- a/tools/perf/Build
+++ b/tools/perf/Build
@@ -45,12 +45,12 @@ CFLAGS_perf.o              += -DPERF_HTML_PATH="BUILD_STR($(htmldir_SQ))"	\
 			      -DPREFIX="BUILD_STR($(prefix_SQ))"
 CFLAGS_builtin-trace.o	   += -DSTRACE_GROUPS_DIR="BUILD_STR($(STRACE_GROUPS_DIR_SQ))"
 CFLAGS_builtin-report.o	   += -DTIPDIR="BUILD_STR($(tipdir_SQ))"
-CFLAGS_builtin-report.o	   += -DDOCDIR="BUILD_STR($(srcdir_SQ)/Documentation)"
 
 perf-y += util/
 perf-y += arch/
 perf-y += ui/
 perf-y += scripts/
 perf-$(CONFIG_TRACE) += trace/beauty/
+perf-y += Documentation/
 
 gtk-y += ui/gtk/
diff --git a/tools/perf/Documentation/Build b/tools/perf/Documentation/Build
new file mode 100644
index 000000000000..83e16764caa4
--- /dev/null
+++ b/tools/perf/Documentation/Build
@@ -0,0 +1,9 @@
+perf-y += tips.o
+
+quiet_cmd_ld_tips = LD       $@
+      cmd_ld_tips = $(LD) -r -b binary -o $@ $<
+
+$(OUTPUT)Documentation/tips.o: Documentation/tips.txt FORCE
+	$(call rule_mkdir)
+	$(call if_changed,ld_tips)
+
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 36f9ccfeb38a..4f2c7ee8fea1 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -47,7 +47,6 @@
 #include "util/time-utils.h"
 #include "util/auxtrace.h"
 #include "util/units.h"
-#include "util/util.h" // perf_tip()
 #include "ui/ui.h"
 #include "ui/progress.h"
 #include "util/block-info.h"
@@ -109,6 +108,9 @@ struct report {
 	int			nr_block_reports;
 };
 
+extern char _binary_Documentation_tips_txt_start[];
+extern char _binary_Documentation_tips_txt_end[];
+
 static int report__config(const char *var, const char *value, void *cb)
 {
 	struct report *rep = cb;
@@ -614,19 +616,33 @@ static int report__gtk_browse_hists(struct report *rep, const char *help)
 	return hist_browser(rep->session->evlist, help, NULL, rep->min_percent);
 }
 
+static const char *perf_tip(void)
+{
+	char *start = _binary_Documentation_tips_txt_start;
+	char *tok, *tmp, *prev;
+	int pick, size;
+
+	size = _binary_Documentation_tips_txt_end - start;
+	pick = random() % size;
+
+	_binary_Documentation_tips_txt_start[size - 1] = 0;
+
+	for (tok = strtok_r(start, "\n", &tmp); tok;
+	     tok = strtok_r(NULL, "\n", &tmp)) {
+		if (pick < (tok - start))
+			return prev;
+		prev = tok;
+	}
+
+	return prev;
+}
+
 static int report__browse_hists(struct report *rep)
 {
 	int ret;
 	struct perf_session *session = rep->session;
 	struct evlist *evlist = session->evlist;
-	const char *help = perf_tip(system_path(TIPDIR));
-
-	if (help == NULL) {
-		/* fallback for people who don't install perf ;-) */
-		help = perf_tip(DOCDIR);
-		if (help == NULL)
-			help = "Cannot load tips.txt file, please install perf!";
-	}
+	const char *help = perf_tip();
 
 	switch (use_browser) {
 	case 1:
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 37a9492edb3e..3bba74e431ed 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -379,34 +379,6 @@ fetch_kernel_version(unsigned int *puint, char *str,
 	return 0;
 }
 
-const char *perf_tip(const char *dirpath)
-{
-	struct strlist *tips;
-	struct str_node *node;
-	char *tip = NULL;
-	struct strlist_config conf = {
-		.dirname = dirpath,
-		.file_only = true,
-	};
-
-	tips = strlist__new("tips.txt", &conf);
-	if (tips == NULL)
-		return errno == ENOENT ? NULL :
-			"Tip: check path of tips.txt or get more memory! ;-p";
-
-	if (strlist__nr_entries(tips) == 0)
-		goto out;
-
-	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
-	if (asprintf(&tip, "Tip: %s", node->s) < 0)
-		tip = (char *)"Tip: get more memory! ;-)";
-
-out:
-	strlist__delete(tips);
-
-	return tip;
-}
-
 char *perf_exe(char *buf, int len)
 {
 	int n = readlink("/proc/self/exe", buf, len);
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index ad737052e597..80b194ee6c7d 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -39,8 +39,6 @@ int fetch_kernel_version(unsigned int *puint,
 #define KVER_FMT	"%d.%d.%d"
 #define KVER_PARAM(x)	KVER_VERSION(x), KVER_PATCHLEVEL(x), KVER_SUBLEVEL(x)
 
-const char *perf_tip(const char *dirpath);
-
 #ifndef HAVE_SCHED_GETCPU_SUPPORT
 int sched_getcpu(void);
 #endif
-- 
2.26.2.Cisco


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