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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-04-16 18:29:01 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-05-03 12:02:04 +0200 |
| commit | 3efa66ce6ee1b55ab687b316e48e1e9ddc1f780a (patch) | |
| tree | 427f2fe8041ef5427cdbf73d202f5fb8c1c1a43f /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | b4432656b36e5cc1d50a1f2dc15357543add530e (diff) | |
rcuref: Provide rcuref_is_dead()
rcuref_read() returns the number of references that are currently held.
If 0 is returned then it is not safe to assume that the object ca be
scheduled for deconstruction because it is marked DEAD. This happens if
the return value of rcuref_put() is ignored and assumptions are made.
If 0 is returned then the counter transitioned from 0 to RCUREF_NOREF.
If rcuref_put() did not return to the caller then the counter did not
yet transition from RCUREF_NOREF to RCUREF_DEAD. This means that there
is still a chance that the counter will transition from RCUREF_NOREF to
0 meaning it is still valid and must not be deconstructed. In this brief
window rcuref_read() will return 0.
Provide rcuref_is_dead() to determine if the counter is marked as
RCUREF_DEAD.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250416162921.513656-2-bigeasy@linutronix.de
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions