diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2025-04-16 18:29:17 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2025-05-03 12:02:09 +0200 |
| commit | c042c505210dc3453f378df432c10fff3d471bc5 (patch) | |
| tree | 1d3ef6d9a73ec25e9ba97684717e60aaba4fdff4 /init | |
| parent | cec199c5e39bde7191a08087cc3d002ccfab31ff (diff) | |
futex: Implement FUTEX2_MPOL
Extend the futex2 interface to be aware of mempolicy.
When FUTEX2_MPOL is specified and there is a MPOL_PREFERRED or
home_node specified covering the futex address, use that hash-map.
Notably, in this case the futex will go to the global node hashtable,
even if it is a PRIVATE futex.
When FUTEX2_NUMA|FUTEX2_MPOL is specified and the user specified node
value is FUTEX_NO_NODE, the MPOL lookup (as described above) will be
tried first before reverting to setting node to the local node.
[bigeasy: add CONFIG_FUTEX_MPOL, add MPOL to FUTEX2_VALID_MASK, write
the node only to user if FUTEX_NO_NODE was supplied]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250416162921.513656-18-bigeasy@linutronix.de
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index 4b84da2b2ec4..b373267ba2e2 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1704,6 +1704,11 @@ config FUTEX_PRIVATE_HASH depends on FUTEX && !BASE_SMALL && MMU default y +config FUTEX_MPOL + bool + depends on FUTEX && NUMA + default y + config EPOLL bool "Enable eventpoll support" if EXPERT default y |