diff options
| author | Pavel Begunkov <asml.silence@gmail.com> | 2023-08-11 13:53:46 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-08-11 10:42:57 -0600 |
| commit | 19a63c4021702e389a559726b16fcbf07a8a05f9 (patch) | |
| tree | 6b7b8db21dfeba497e12914afec8d01cdbd28020 /io_uring/io_uring.c | |
| parent | b6b2bb58a75407660f638a68e6e34a07036146d0 (diff) | |
io_uring/rsrc: keep one global dummy_ubuf
We set empty registered buffers to dummy_ubuf as an optimisation.
Currently, we allocate the dummy entry for each ring, whenever we can
simply have one global instance.
We're casting out const on assignment, it's fine as we're not going to
change the content of the dummy, the constness gives us an extra layer
of protection if sth ever goes wrong.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/e4a96dda35ab755914bc43f6781bba0df97ac489.1691757663.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/io_uring.c')
| -rw-r--r-- | io_uring/io_uring.c | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index e57d00939ab9..a7a4d637aee0 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -290,13 +290,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) goto err; if (io_alloc_hash_table(&ctx->cancel_table_locked, hash_bits)) goto err; - - ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); - if (!ctx->dummy_ubuf) - goto err; - /* set invalid range, so io_import_fixed() fails meeting it */ - ctx->dummy_ubuf->ubuf = -1UL; - if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free, 0, GFP_KERNEL)) goto err; @@ -335,7 +328,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) INIT_WQ_LIST(&ctx->submit_state.compl_reqs); return ctx; err: - kfree(ctx->dummy_ubuf); kfree(ctx->cancel_table.hbs); kfree(ctx->cancel_table_locked.hbs); kfree(ctx->io_bl); @@ -2897,7 +2889,6 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) io_wq_put_hash(ctx->hash_map); kfree(ctx->cancel_table.hbs); kfree(ctx->cancel_table_locked.hbs); - kfree(ctx->dummy_ubuf); kfree(ctx->io_bl); xa_destroy(&ctx->io_bl_xa); kfree(ctx); |