iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

io-uring: add sqpoll support for napi busy poll

Browse Source 
This adds the sqpoll support to the io-uring napi.

Signed-off-by: Stefan Roesch <shr@devkernel.io>
Suggested-by: Olivier Langlois <olivier@trillion01.com>
Link: https://lore.kernel.org/r/20230608163839.2891748-6-shr@devkernel.io
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Stefan Roesch
2023-06-08 09:38:37 -07:00
committed by Jens Axboe
parent 8d0c12a80c
commit ff183d427d
3 changed files with 33 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
io_uring/napi.c
View File

@@ -252,4 +252,28 @@ void __io_napi_busy_loop(struct io_ring_ctx *ctx, struct io_wait_queue *iowq)
io_napi_blocking_busy_loop(ctx, iowq);
}
/*
* io_napi_sqpoll_busy_poll() - busy poll loop for sqpoll
* @ctx: pointer to io-uring context structure
*
* Splice of the napi list and execute the napi busy poll loop.
*/
int io_napi_sqpoll_busy_poll(struct io_ring_ctx *ctx)
{
LIST_HEAD(napi_list);
bool is_stale = false;
if (!READ_ONCE(ctx->napi_busy_poll_to))
return 0;
if (list_empty_careful(&ctx->napi_list))
return 0;
rcu_read_lock();
is_stale = __io_napi_do_busy_loop(ctx, NULL);
rcu_read_unlock();
io_napi_remove_stale(ctx, is_stale);
return 1;
}
#endif