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Currently lists are being used to manage this, but best practice is usually to have these in an array instead as that it cheaper to manage. Outside of that detail, games are also played with KASAN as the list is inside the cached entry itself. Finally, all users of this need a struct io_cache_entry embedded in their struct, which is union'ized with something else in there that isn't used across the free -> realloc cycle. Get rid of all of that, and simply have it be an array. This will not change the memory used, as we're just trading an 8-byte member entry for the per-elem array size. This reduces the overhead of the recycled allocations, and it reduces the amount of code code needed to support recycling to about half of what it currently is. Signed-off-by: Jens Axboe <axboe@kernel.dk>
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "cancel.h"
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int io_futex_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_futexv_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);
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int io_futex_wait(struct io_kiocb *req, unsigned int issue_flags);
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int io_futexv_wait(struct io_kiocb *req, unsigned int issue_flags);
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int io_futex_wake(struct io_kiocb *req, unsigned int issue_flags);
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#if defined(CONFIG_FUTEX)
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int io_futex_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd,
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unsigned int issue_flags);
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bool io_futex_remove_all(struct io_ring_ctx *ctx, struct task_struct *task,
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bool cancel_all);
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bool io_futex_cache_init(struct io_ring_ctx *ctx);
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void io_futex_cache_free(struct io_ring_ctx *ctx);
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#else
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static inline int io_futex_cancel(struct io_ring_ctx *ctx,
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struct io_cancel_data *cd,
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unsigned int issue_flags)
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{
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return 0;
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}
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static inline bool io_futex_remove_all(struct io_ring_ctx *ctx,
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struct task_struct *task, bool cancel_all)
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{
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return false;
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}
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static inline bool io_futex_cache_init(struct io_ring_ctx *ctx)
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{
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return false;
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}
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static inline void io_futex_cache_free(struct io_ring_ctx *ctx)
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{
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}
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#endif
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