Ian Rogers 979e87ab1f perf symbol: Add setters for bitfields sharing a byte to avoid concurrent update issues ...

A problem with putting bitfields into struct symbol is that other bits in
the symbol could be updated concurrently and only one update to the
underlying storage unit happen, leading to lost updates.

To avoid this, use atomics to atomically read or set part of 16-bits
of flags in the symbol. Add accessors to simplify this.

The idle value has 3 values in preparation for a later change that
will lazily update it.

Assisted-by: Gemini:gemini-3.1-pro-preview
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Honglei Wang <jameshongleiwang@126.com>
Cc: Jan Polensky <japo@linux.ibm.com>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2026-06-03 16:53:45 -03:00

..

Build

perf build: Disable thread safety analysis for perl header

2025-10-06 16:49:25 -03:00

trace-event-perl.c

perf symbol: Add setters for bitfields sharing a byte to avoid concurrent update issues

2026-06-03 16:53:45 -03:00

trace-event-python.c

perf symbol: Add setters for bitfields sharing a byte to avoid concurrent update issues

2026-06-03 16:53:45 -03:00