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Commit a1231fda authored by Trond Myklebust's avatar Trond Myklebust
Browse files

SUNRPC: Set memalloc_nofs_save() on all rpciod/xprtiod jobs 



Set memalloc_nofs_save() on all the rpciod/xprtiod jobs so that we
ensure memory allocations for asynchronous rpc calls don't ever end
up recursing back to the NFS layer for memory reclaim.

Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
parent e9acf210

net/sunrpc/sched.c

+7 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/spinlock.h>

#include <linux/mutex.h>

#include <linux/freezer.h>

#include <linux/sched/mm.h>



#include <linux/sunrpc/clnt.h>
@@ -902,7 +903,10 @@ void rpc_execute(struct rpc_task *task) 


static void rpc_async_schedule(struct work_struct *work)

{

	unsigned int pflags = memalloc_nofs_save();



	__rpc_execute(container_of(work, struct rpc_task, u.tk_work));

	memalloc_nofs_restore(pflags);

}



/**
@@ -1067,7 +1071,10 @@ static void rpc_free_task(struct rpc_task *task) 


static void rpc_async_release(struct work_struct *work)

{

	unsigned int pflags = memalloc_nofs_save();



	rpc_free_task(container_of(work, struct rpc_task, u.tk_work));

	memalloc_nofs_restore(pflags);

}



static void rpc_release_resources_task(struct rpc_task *task)

net/sunrpc/xprt.c

+3 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ 
#include <linux/sunrpc/metrics.h>

#include <linux/sunrpc/bc_xprt.h>

#include <linux/rcupdate.h>

#include <linux/sched/mm.h>



#include <trace/events/sunrpc.h>
@@ -643,11 +644,13 @@ static void xprt_autoclose(struct work_struct *work) 
{

	struct rpc_xprt *xprt =

		container_of(work, struct rpc_xprt, task_cleanup);

	unsigned int pflags = memalloc_nofs_save();



	clear_bit(XPRT_CLOSE_WAIT, &xprt->state);

	xprt->ops->close(xprt);

	xprt_release_write(xprt, NULL);

	wake_up_bit(&xprt->state, XPRT_LOCKED);

	memalloc_nofs_restore(pflags);

}



/**

net/sunrpc/xprtsock.c

+7 −3
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ 
#include <linux/bvec.h>

#include <linux/highmem.h>

#include <linux/uio.h>

#include <linux/sched/mm.h>



#include <trace/events/sunrpc.h>
@@ -680,7 +681,10 @@ static void xs_stream_data_receive_workfn(struct work_struct *work) 
{

	struct sock_xprt *transport =

		container_of(work, struct sock_xprt, recv_worker);

	unsigned int pflags = memalloc_nofs_save();



	xs_stream_data_receive(transport);

	memalloc_nofs_restore(pflags);

}



static void
@@ -1378,7 +1382,10 @@ static void xs_udp_data_receive_workfn(struct work_struct *work) 
{

	struct sock_xprt *transport =

		container_of(work, struct sock_xprt, recv_worker);

	unsigned int pflags = memalloc_nofs_save();



	xs_udp_data_receive(transport);

	memalloc_nofs_restore(pflags);

}



/**
@@ -1869,7 +1876,6 @@ static int xs_local_finish_connecting(struct rpc_xprt *xprt, 
		sk->sk_write_space = xs_udp_write_space;

		sock_set_flag(sk, SOCK_FASYNC);

		sk->sk_error_report = xs_error_report;

		sk->sk_allocation = GFP_NOIO;



		xprt_clear_connected(xprt);
@@ -2057,7 +2063,6 @@ static void xs_udp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 
		sk->sk_data_ready = xs_data_ready;

		sk->sk_write_space = xs_udp_write_space;

		sock_set_flag(sk, SOCK_FASYNC);

		sk->sk_allocation = GFP_NOIO;



		xprt_set_connected(xprt);
@@ -2220,7 +2225,6 @@ static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) 
		sk->sk_write_space = xs_tcp_write_space;

		sock_set_flag(sk, SOCK_FASYNC);

		sk->sk_error_report = xs_error_report;

		sk->sk_allocation = GFP_NOIO;



		/* socket options */

		sock_reset_flag(sk, SOCK_LINGER);