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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-04-16 18:29:08 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-05-03 12:02:06 +0200 |
| commit | 3f6b233018af2a6fb449faa324d94a437e2e47ce (patch) | |
| tree | 91387ca8fecbc371c18b3f3aeb9cbafe5c48212e /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | d854e4e7850e6d3ed24f863a877abc2279d60506 (diff) | |
futex: Acquire a hash reference in futex_wait_multiple_setup()
futex_wait_multiple_setup() changes task_struct::__state to
!TASK_RUNNING and then enqueues on multiple futexes. Every
futex_q_lock() acquires a reference on the global hash which is
dropped later.
If a rehash is in progress then the loop will block on
mm_struct::futex_hash_bucket for the rehash to complete and this will
lose the previously set task_struct::__state.
Acquire a reference on the local hash to avoiding blocking on
mm_struct::futex_hash_bucket.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250416162921.513656-9-bigeasy@linutronix.de
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions