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author | Jens Axboe <axboe@kernel.dk> | 2021-06-17 10:19:54 -0600 |
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committer | Jens Axboe <axboe@kernel.dk> | 2021-06-17 10:25:50 -0600 |
commit | fe76421d1da1dcdb3a2cd8428ac40106bff28bc0 (patch) | |
tree | dc590c0c33f23e65a0e11cceb7be870944d0360a /fs/io-wq.h | |
parent | 0e03496d1967abf1ebb151a24318c07d07f41f7f (diff) | |
download | linux-fe76421d1da1dcdb3a2cd8428ac40106bff28bc0.tar.bz2 |
io_uring: allow user configurable IO thread CPU affinity
io-wq defaults to per-node masks for IO workers. This works fine by
default, but isn't particularly handy for workloads that prefer more
specific affinities, for either performance or isolation reasons.
This adds IORING_REGISTER_IOWQ_AFF that allows the user to pass in a CPU
mask that is then applied to IO thread workers, and an
IORING_UNREGISTER_IOWQ_AFF that simply resets the masks back to the
default of per-node.
Note that no care is given to existing IO threads, they will need to go
through a reschedule before the affinity is correct if they are already
running or sleeping.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io-wq.h')
-rw-r--r-- | fs/io-wq.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/io-wq.h b/fs/io-wq.h index af2df0680ee2..02299cdcf55c 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -128,6 +128,8 @@ void io_wq_put_and_exit(struct io_wq *wq); void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work); void io_wq_hash_work(struct io_wq_work *work, void *val); +int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask); + static inline bool io_wq_is_hashed(struct io_wq_work *work) { return work->flags & IO_WQ_WORK_HASHED; |