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SUNRPC/xprt: async tasks mustn't block waiting for memory

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When memory is short, new worker threads cannot be created and we depend
on the minimum one rpciod thread to be able to handle everything.  So it
must not block waiting for memory.

xprt_dynamic_alloc_slot can block indefinitely.  This can tie up all
workqueue threads and NFS can deadlock.  So when called from a
workqueue, set __GFP_NORETRY.

The rdma alloc_slot already does not block.  However it sets the error
to -EAGAIN suggesting this will trigger a sleep.  It does not.  As we
can see in call_reserveresult(), only -ENOMEM causes a sleep.  -EAGAIN
causes immediate retry.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
NeilBrown 2022-03-07 10:41:44 +11:00 committed by Trond Myklebust
parent a41b05edfe
commit a721035477
2 changed files with 5 additions and 2 deletions
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5
net/sunrpc/xprt.c
View file

@ -1687,12 +1687,15 @@ static bool xprt_throttle_congested(struct rpc_xprt *xprt, struct rpc_task *task
static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt)
{
struct rpc_rqst *req = ERR_PTR(-EAGAIN);
gfp_t gfp_mask = GFP_KERNEL;
if (xprt->num_reqs >= xprt->max_reqs)
goto out;
++xprt->num_reqs;
spin_unlock(&xprt->reserve_lock);
req = kzalloc(sizeof(struct rpc_rqst), GFP_KERNEL);
if (current->flags & PF_WQ_WORKER)
gfp_mask |= __GFP_NORETRY | __GFP_NOWARN;
req = kzalloc(sizeof(*req), gfp_mask);
spin_lock(&xprt->reserve_lock);
if (req != NULL)
goto out;

2
net/sunrpc/xprtrdma/transport.c
View file

@ -517,7 +517,7 @@ xprt_rdma_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task)
return;
out_sleep:
task->tk_status = -EAGAIN;
task->tk_status = -ENOMEM;
xprt_add_backlog(xprt, task);
}