io_uring: track io length in async_list based on bytes (9310a7ba) · Commits · 戴 / test

fs/io_uring.c

+11 −13

Original line number	Diff line number	Diff line
		@@ -202,7 +202,7 @@ struct async_list {

		struct file *file;
		off_t io_end;
		size_t io_pages;
		size_t io_len;
		};

		struct io_ring_ctx {
		@@ -1158,28 +1158,26 @@ static void io_async_list_note(int rw, struct io_kiocb *req, size_t len)
		off_t io_end = kiocb->ki_pos + len;

		if (filp == async_list->file && kiocb->ki_pos == async_list->io_end) {
		unsigned long max_pages;
		unsigned long max_bytes;

		/* Use 8x RA size as a decent limiter for both reads/writes */
		max_pages = filp->f_ra.ra_pages;
		if (!max_pages)
		max_pages = VM_READAHEAD_PAGES;
		max_pages *= 8;

		/* If max pages are exceeded, reset the state */
		len >>= PAGE_SHIFT;
		if (async_list->io_pages + len <= max_pages) {
		max_bytes = filp->f_ra.ra_pages << (PAGE_SHIFT + 3);
		if (!max_bytes)
		max_bytes = VM_READAHEAD_PAGES << (PAGE_SHIFT + 3);

		/* If max len are exceeded, reset the state */
		if (async_list->io_len + len <= max_bytes) {
		req->flags \|= REQ_F_SEQ_PREV;
		async_list->io_pages += len;
		async_list->io_len += len;
		} else {
		io_end = 0;
		async_list->io_pages = 0;
		async_list->io_len = 0;
		}
		}

		/* New file? Reset state. */
		if (async_list->file != filp) {
		async_list->io_pages = 0;
		async_list->io_len = 0;
		async_list->file = filp;
		}
		async_list->io_end = io_end;