ring-buffer: Check for empty ring-buffer with rb_num_of_entries()

Browse source

Currently there are two ways of identifying an empty ring-buffer. One
relying on the current status of the commit / reader page
(rb_per_cpu_empty()) and the other on the write and read counters
(rb_num_of_entries() used in rb_get_reader_page()).

with rb_num_of_entries(). This intends to ease later
introduction of ring-buffer writers which are out of the kernel control
and with whom, the only information available is through the meta-page
counters.

Link: https://lore.kernel.org/20250108114536.627715-2-vdonnefort@google.com
Signed-off-by: Vincent Donnefort <vdonnefort@google.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

...

This commit is contained in:

Vincent Donnefort 2025-01-08 11:45:25 +00:00 • committed by Steven Rostedt (Google)

parent 5bc55a333a

commit 0568c6ebf0

1 changed files with 14 additions and 45 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

59

kernel/trace/ring_buffer.c

View file