Re: [PATCH v4 7/7] perf lock contention: Extend BPF lock contention to RCU and SRCU

[sashiko-bot@kernel.org]

> Extend 'perf lock contention --use-bpf' to track RCU and SRCU
> grace-period and barrier waits:
> 
> - Attach fentry/fexit programs to synchronize_rcu(),
>   synchronize_rcu_expedited(), synchronize_rcu_tasks(), rcu_barrier(),
>   synchronize_srcu(), synchronize_srcu_expedited(), and srcu_barrier()
>   when available in BTF.
> - Support filtering by lock type ('-Y rcu', '-Y rcu:W', '-Y srcu',
>   '-Y srcu:W') and by lock name ('-L rcu' or specific srcu_struct
>   symbol names).
> 
> Example usage:
> 
>   # perf lock con -a -b -Y rcu,srcu -F wait_total,avg_wait -- sleep 1
>      total wait     avg wait         type   caller
> 
>        35.12 ms      8.78 ms        rcu:W   cleanup_net+0x284
>         7.84 ms      3.92 ms       srcu:W   __fsnotify_parent+0x114
> 
>   # perf lock con -a -b -l -L rcu -F wait_total,avg_wait -- sleep 1
>      total wait     avg wait            address   symbol
> 
>        35.12 ms      8.78 ms   ffffffff83754dc0   rcu (rcu)
> 
> Signed-off-by: Ian Rogers <irogers@google.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261019220915.3943592-1-irogers@google.com?part=7