Commit e38b3f20 authored Aug 30, 2021 by NeilBrown Committed by Chuck Lever Sep 01, 2021

SUNRPC: don't pause on incomplete allocation



alloc_pages_bulk_array() attempts to allocate at least one page based on
the provided pages, and then opportunistically allocates more if that
can be done without dropping the spinlock.

So if it returns fewer than requested, that could just mean that it
needed to drop the lock.  In that case, try again immediately.

Only pause for a time if no progress could be made.

Reported-and-tested-by: Mike Javorski <mike.javorski@gmail.com>
Reported-and-tested-by: Lothar Paltins <lopa@mailbox.org>
Fixes: f6e70aab ("SUNRPC: refresh rq_pages using a bulk page allocator")
Signed-off-by: NeilBrown <neilb@suse.de>
Acked-by: Mel Gorman <mgorman@suse.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

parent 0bcc7ca4

net/sunrpc/svc_xprt.c

+7 −6

Original line number	Diff line number	Diff line
		@@ -663,7 +663,7 @@ static int svc_alloc_arg(struct svc_rqst *rqstp)
		{
		struct svc_serv *serv = rqstp->rq_server;
		struct xdr_buf *arg = &rqstp->rq_arg;
		unsigned long pages, filled;
		unsigned long pages, filled, ret;

		pagevec_init(&rqstp->rq_pvec);

		@@ -675,11 +675,12 @@ static int svc_alloc_arg(struct svc_rqst *rqstp)
		pages = RPCSVC_MAXPAGES;
		}

		for (;;) {
		filled = alloc_pages_bulk_array(GFP_KERNEL, pages,
		for (filled = 0; filled < pages; filled = ret) {
		ret = alloc_pages_bulk_array(GFP_KERNEL, pages,
		rqstp->rq_pages);
		if (filled == pages)
		break;
		if (ret > filled)
		/* Made progress, don't sleep yet */
		continue;

		set_current_state(TASK_INTERRUPTIBLE);
		if (signalled() \|\| kthread_should_stop()) {