On 2/24/25 21:31, Keith Busch wrote:
From: Keith Busch <kbusch@xxxxxxxxxx>
Frequent alloc/free cycles on these is pretty costly. Use an io cache to
more efficiently reuse these buffers.
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
---
include/linux/io_uring_types.h | 18 ++---
io_uring/filetable.c | 2 +-
io_uring/rsrc.c | 120 +++++++++++++++++++++++++--------
io_uring/rsrc.h | 2 +-
4 files changed, 104 insertions(+), 38 deletions(-)
...
+static __cold int io_rsrc_buffer_alloc(struct io_buf_table *table, unsigned nr)
+{
+ const int imu_cache_size = struct_size_t(struct io_mapped_ubuf, bvec,
+ IO_CACHED_BVECS_SEGS);
+ const int node_size = sizeof(struct io_rsrc_node);
+ int ret;
+
+ ret = io_rsrc_data_alloc(&table->data, nr);
+ if (ret)
+ return ret;
+
+ if (io_alloc_cache_init(&table->node_cache, nr, node_size, 0))
We shouldn't use nr for the cache size, that could be unreasonably
huge for a cache. Let's use a constant for now and that should be
good enough, at least for now. 64 would be a good default. Same for
the imu cache.
--
Pavel Begunkov
