buildstats.py: extend diskstats support for NVMe and flexible token count

Added support for NVMe devices in the diskstats regex pattern to ensure stats are properly collected from devices like nvme0n1.

Relaxed the check for the number of fields in /proc/diskstats from an exact match (14) to a minimum check (at least 14), to handle kernel variations and additional fields gracefully.

(From OE-Core rev: 87a31bc4ca3661aae94cf43f3f579b02f4fb4923)

Signed-off-by: denisova-ok <denisova.olga.k@yandex.ru>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/buildstats.py

@@ -66,7 +66,7 @@ class SystemStats:
         self.min_seconds = 1.0 - self.tolerance
 
         self.meminfo_regex = re.compile(rb'^(MemTotal|MemFree|Buffers|Cached|SwapTotal|SwapFree):\s*(\d+)')
-        self.diskstats_regex = re.compile(rb'^([hsv]d.|mtdblock\d|mmcblk\d|cciss/c\d+d\d+.*)$')
+        self.diskstats_regex = re.compile(rb'^([hsv]d.|mtdblock\d|mmcblk\d|cciss/c\d+d\d+|nvme\d+n\d+.*)$')
         self.diskstats_ltime = None
         self.diskstats_data = None
         self.stat_ltimes = None
@@ -94,7 +94,7 @@ class SystemStats:
                                (b'MemTotal', b'MemFree', b'Buffers', b'Cached', b'SwapTotal', b'SwapFree')]) + b'\n')
 
     def _diskstats_is_relevant_line(self, linetokens):
-        if len(linetokens) != 14:
+        if len(linetokens) < 14:
             return False
         disk = linetokens[2]
         return self.diskstats_regex.match(disk)