Commit 10888129 authored Jun 30, 2017 by Javier González Committed by Jens Axboe Jun 30, 2017

lightnvm: pblk: schedule if data is not ready



When user threads place data into the write buffer, they reserve space
and do the memory copy out of the lock. As a consequence, when the write
thread starts persisting data, there is a chance that it is not copied
yet. In this case, avoid polling, and schedule before retrying.

Signed-off-by: Javier González <javier@cnexlabs.com>
Signed-off-by: Matias Bjørling <matias@cnexlabs.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

parent 653cbb84

drivers/lightnvm/pblk-rb.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -578,8 +578,10 @@ unsigned int pblk_rb_read_to_bio(struct pblk_rb rb, struct nvm_rq rqd,
		*/
		try:
		flags = READ_ONCE(entry->w_ctx.flags);
		if (!(flags & PBLK_WRITTEN_DATA))
		if (!(flags & PBLK_WRITTEN_DATA)) {
		io_schedule();
		goto try;
		}

		page = virt_to_page(entry->data);
		if (!page) {