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authorPavel Begunkov <asml.silence@gmail.com>2023-04-11 14:06:05 +0300
committerJens Axboe <axboe@kernel.dk>2023-04-12 21:09:41 +0300
commit528407b1e0ea51260fff2cc8b669c632a65d7a09 (patch)
treefc71826287bad3c13e9e8408582f5113d331535f /io_uring
parent786788a8cfe03056e9c7b1c6e418c1db92a0ce80 (diff)
downloadlinux-528407b1e0ea51260fff2cc8b669c632a65d7a09.tar.xz
io_uring/rsrc: consolidate node caching
We store one pre-allocated rsrc node in ->rsrc_backup_node, merge it with ->rsrc_node_cache. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/6d5410e51ccd29be7a716be045b51d6b371baef6.1681210788.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/alloc_cache.h5
-rw-r--r--io_uring/io_uring.c2
-rw-r--r--io_uring/rsrc.c20
3 files changed, 16 insertions, 11 deletions
diff --git a/io_uring/alloc_cache.h b/io_uring/alloc_cache.h
index 851a527afb5e..241245cb54a6 100644
--- a/io_uring/alloc_cache.h
+++ b/io_uring/alloc_cache.h
@@ -23,6 +23,11 @@ static inline bool io_alloc_cache_put(struct io_alloc_cache *cache,
return false;
}
+static inline bool io_alloc_cache_empty(struct io_alloc_cache *cache)
+{
+ return !cache->list.next;
+}
+
static inline struct io_cache_entry *io_alloc_cache_get(struct io_alloc_cache *cache)
{
if (cache->list.next) {
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index b171c26d331d..075bae8a2bb1 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -2852,8 +2852,6 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
/* there are no registered resources left, nobody uses it */
if (ctx->rsrc_node)
io_rsrc_node_destroy(ctx, ctx->rsrc_node);
- if (ctx->rsrc_backup_node)
- io_rsrc_node_destroy(ctx, ctx->rsrc_backup_node);
WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list));
diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index 24e4e2109549..73f9e10d9bf0 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -230,7 +230,7 @@ void io_rsrc_node_switch(struct io_ring_ctx *ctx,
struct io_rsrc_data *data_to_kill)
__must_hold(&ctx->uring_lock)
{
- WARN_ON_ONCE(!ctx->rsrc_backup_node);
+ WARN_ON_ONCE(io_alloc_cache_empty(&ctx->rsrc_node_cache));
WARN_ON_ONCE(data_to_kill && !ctx->rsrc_node);
if (data_to_kill) {
@@ -245,18 +245,20 @@ void io_rsrc_node_switch(struct io_ring_ctx *ctx,
ctx->rsrc_node = NULL;
}
- if (!ctx->rsrc_node) {
- ctx->rsrc_node = ctx->rsrc_backup_node;
- ctx->rsrc_backup_node = NULL;
- }
+ if (!ctx->rsrc_node)
+ ctx->rsrc_node = io_rsrc_node_alloc(ctx);
}
int io_rsrc_node_switch_start(struct io_ring_ctx *ctx)
{
- if (ctx->rsrc_backup_node)
- return 0;
- ctx->rsrc_backup_node = io_rsrc_node_alloc(ctx);
- return ctx->rsrc_backup_node ? 0 : -ENOMEM;
+ if (io_alloc_cache_empty(&ctx->rsrc_node_cache)) {
+ struct io_rsrc_node *node = kzalloc(sizeof(*node), GFP_KERNEL);
+
+ if (!node)
+ return -ENOMEM;
+ io_alloc_cache_put(&ctx->rsrc_node_cache, &node->cache);
+ }
+ return 0;
}
__cold static int io_rsrc_ref_quiesce(struct io_rsrc_data *data,