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io_uring: cache __io_free_req()'d requests

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Don't kfree requests in __io_free_req() but put them back into the
internal request cache. That makes allocations more sustainable and will
be used for refcounting optimisations.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/9f4950fbe7771c8d41799366d0a3a08ac3040236.1628536684.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-08-09 20:18:08 +01:00 committed by Jens Axboe
parent f56165e62f
commit c34b025f2d
1 changed files with 6 additions and 1 deletions
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7
fs/io_uring.c
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@ -1831,11 +1831,16 @@ static void io_dismantle_req(struct io_kiocb *req)
static void __io_free_req(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
unsigned long flags;
io_dismantle_req(req);
io_put_task(req->task, 1);
kmem_cache_free(req_cachep, req);
spin_lock_irqsave(&ctx->completion_lock, flags);
list_add(&req->compl.list, &ctx->locked_free_list);
ctx->locked_free_nr++;
spin_unlock_irqrestore(&ctx->completion_lock, flags);
percpu_ref_put(&ctx->refs);
}