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selftests/rseq: Implement rseq numa node id field selftest

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Test the NUMA node id extension rseq field. Compare it against the value
returned by the getcpu(2) system call while pinned on a specific core.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20221122203932.231377-7-mathieu.desnoyers@efficios.com
This commit is contained in:
Mathieu Desnoyers
2022-11-22 15:39:08 -05:00
committed by Peter Zijlstra
parent 03f5c0272d
commit 99babd04b2
4 changed files with 58 additions and 0 deletions
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8
tools/testing/selftests/rseq/rseq-abi.h
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@@ -147,6 +147,14 @@ struct rseq_abi {
*/
__u32 flags;
/*
* Restartable sequences node_id field. Updated by the kernel. Read by
* user-space with single-copy atomicity semantics. This field should
* only be read by the thread which registered this data structure.
* Aligned on 32-bit. Contains the current NUMA node ID.
*/
__u32 node_id;
/*
* Flexible array member at end of structure, after last feature field.
*/