Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-09-20 15:03:04 +00:00
Code Issues Packages Projects Releases Wiki Activity

io_uring: allow conditional reschedule for intensive iterators

Browse Source 
If we have a lot of threads and rings, the tctx list can get quite big.
This is especially true if we keep creating new threads and rings.
Likewise for the provided buffers list. Be nice and insert a conditional
reschedule point while iterating the nodes for deletion.

Link: https://lore.kernel.org/io-uring/00000000000064b6b405ccb41113@google.com/
Reported-by: syzbot+111d2a03f51f5ae73775@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2021-09-24 07:12:27 -06:00
parent 5b7aa38d86
commit 8bab4c09f2
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/io_uring.c
View File

@ -9173,8 +9173,10 @@ static void io_destroy_buffers(struct io_ring_ctx *ctx)
struct io_buffer *buf;
unsigned long index;
xa_for_each(&ctx->io_buffers, index, buf)
xa_for_each(&ctx->io_buffers, index, buf) {
__io_remove_buffers(ctx, buf, index, -1U);
cond_resched();
}
}
static void io_req_cache_free(struct list_head *list)
@ -9672,8 +9674,10 @@ static void io_uring_clean_tctx(struct io_uring_task *tctx)
struct io_tctx_node *node;
unsigned long index;
xa_for_each(&tctx->xa, index, node)
xa_for_each(&tctx->xa, index, node) {
io_uring_del_tctx_node(index);
cond_resched();
}
if (wq) {
/*
* Must be after io_uring_del_task_file() (removes nodes under