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

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[ Upstream commit c487216bec83b0c5a8803e5c61433d33ad7b104d ]

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.

mempools are particularly a problem as memory can only be released back
to the mempool by an async rpc task running.  If all available
workqueue threads are waiting on the mempool, no thread is available to
return anything.

rpc_malloc() can block, and this might cause deadlocks.
So check RPC_IS_ASYNC(), rather than RPC_IS_SWAPPER() to determine if
blocking is acceptable.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
NeilBrown 2022-03-07 10:41:44 +11:00 committed by Greg Kroah-Hartman
parent 3e8a576f2b
commit cec05d9901
2 changed files with 6 additions and 2 deletions
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4
net/sunrpc/sched.c
View File

@ -883,8 +883,10 @@ int rpc_malloc(struct rpc_task *task)
struct rpc_buffer *buf;
gfp_t gfp = GFP_NOIO | __GFP_NOWARN;
if (RPC_IS_ASYNC(task))
gfp = GFP_NOWAIT | __GFP_NOWARN;
if (RPC_IS_SWAPPER(task))
gfp = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
gfp |= __GFP_MEMALLOC;
size += sizeof(struct rpc_buffer);
if (size <= RPC_BUFFER_MAXSIZE)

4
net/sunrpc/xprtrdma/transport.c
View File

@ -577,8 +577,10 @@ xprt_rdma_allocate(struct rpc_task *task)
return -ENOMEM;
flags = RPCRDMA_DEF_GFP;
if (RPC_IS_ASYNC(task))
flags = GFP_NOWAIT | __GFP_NOWARN;
if (RPC_IS_SWAPPER(task))
flags = __GFP_MEMALLOC | GFP_NOWAIT | __GFP_NOWARN;
flags |= __GFP_MEMALLOC;
if (!rpcrdma_get_rdmabuf(r_xprt, req, flags))
goto out_fail;