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authorPavel Begunkov <asml.silence@gmail.com>2022-07-12 23:52:39 +0300
committerJens Axboe <axboe@kernel.dk>2022-07-25 03:41:06 +0300
commiteb4a299b2f95437af6183946c2a2e850621cefdb (patch)
tree16bd25d7e2ca9aab186eae6e517425c4da8e9b96 /io_uring/notif.h
parenteb42cebb2cf24c48f60c32856a4bba93d42659c8 (diff)
downloadlinux-eb4a299b2f95437af6183946c2a2e850621cefdb.tar.xz
io_uring: cache struct io_notif
kmalloc'ing struct io_notif is too expensive when done frequently, cache them as many other resources in io_uring. Keep two list, the first one is from where we're getting notifiers, it's protected by ->uring_lock. The second is protected by ->completion_lock, to which we queue released notifiers. Then we splice one list into another when needed. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/9dec18f7fcbab9f4bd40b96e5ae158b119945230.1657643355.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring/notif.h')
-rw-r--r--io_uring/notif.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/io_uring/notif.h b/io_uring/notif.h
index 3d7a1d242e17..b23c9c0515bb 100644
--- a/io_uring/notif.h
+++ b/io_uring/notif.h
@@ -5,6 +5,8 @@
#include <net/sock.h>
#include <linux/nospec.h>
+#define IO_NOTIF_SPLICE_BATCH 32
+
struct io_notif {
struct ubuf_info uarg;
struct io_ring_ctx *ctx;
@@ -13,6 +15,8 @@ struct io_notif {
u64 tag;
/* see struct io_notif_slot::seq */
u32 seq;
+ /* hook into ctx->notif_list and ctx->notif_list_locked */
+ struct list_head cache_node;
union {
struct callback_head task_work;
@@ -41,6 +45,7 @@ struct io_notif_slot {
};
int io_notif_unregister(struct io_ring_ctx *ctx);
+void io_notif_cache_purge(struct io_ring_ctx *ctx);
struct io_notif *io_alloc_notif(struct io_ring_ctx *ctx,
struct io_notif_slot *slot);