linux-kernel - [PATCH RFC v5 01/13] perf jevents: Add support for an extra directory level

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Message-ID: <1604666153-4187-2-git-send-email-john.garry@huawei.com>
Date:   Fri, 6 Nov 2020 20:35:41 +0800
From:   John Garry <john.garry@...wei.com>
To:     <acme@...nel.org>, <will@...nel.org>, <mark.rutland@....com>,
        <jolsa@...hat.com>, <irogers@...gle.com>, <leo.yan@...aro.org>,
        <peterz@...radead.org>, <mingo@...hat.com>,
        <alexander.shishkin@...ux.intel.com>, <namhyung@...nel.org>,
        <mathieu.poirier@...aro.org>
CC:     <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <qiangqing.zhang@....com>,
        <zhangshaokun@...ilicon.com>, <linux-imx@....com>,
        <kjain@...ux.ibm.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v5 01/13] perf jevents: Add support for an extra directory level

Currently only upto a level 2 directory is supported, in form
vendor/platform.

Add support for a further level, to support vendor/platform
sub-directories in future.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 tools/perf/pmu-events/jevents.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index 72cfa3b5046d..9022216b1253 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -978,15 +978,20 @@ static int process_one_file(const char *fpath, const struct stat *sb,
 	int level   = ftwbuf->level;
 	int err = 0;
 
-	if (level == 2 && is_dir) {
+	if (level >= 2 && is_dir) {
+		int count = 0;
 		/*
 		 * For level 2 directory, bname will include parent name,
 		 * like vendor/platform. So search back from platform dir
 		 * to find this.
+		 * Something similar for level 3 directory, but we're a PMU
+		 * category folder, like vendor/platform/cpu.
 		 */
 		bname = (char *) fpath + ftwbuf->base - 2;
 		for (;;) {
 			if (*bname == '/')
+				count++;
+			if (count == level - 1)
 				break;
 			bname--;
 		}
@@ -999,13 +1004,13 @@ static int process_one_file(const char *fpath, const struct stat *sb,
 		 level, sb->st_size, bname, fpath);
 
 	/* base dir or too deep */
-	if (level == 0 || level > 3)
+	if (level == 0 || level > 4)
 		return 0;
 
 
 	/* model directory, reset topic */
 	if ((level == 1 && is_dir && is_leaf_dir(fpath)) ||
-	    (level == 2 && is_dir)) {
+	    (level >= 2 && is_dir && is_leaf_dir(fpath))) {
 		if (close_table)
 			print_events_table_suffix(eventsfp);
 
-- 
2.26.2