* [PATCH] SUNRPC: Set memalloc_nofs_save() on all rpciod/xprtiod jobs
@ 2019-02-19 14:02 Trond Myklebust
0 siblings, 0 replies; only message in thread
From: Trond Myklebust @ 2019-02-19 14:02 UTC (permalink / raw)
To: linux-nfs
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: Trond Myklebust <trond.myklebust@hammerspace.com>
---
net/sunrpc/sched.c | 7 +++++++
net/sunrpc/xprt.c | 3 +++
net/sunrpc/xprtsock.c | 10 +++++++---
3 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index adc3c40cc733..2168d4d9c09f 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -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)
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c
index f1ec2110efeb..b95f4452dbc6 100644
--- a/net/sunrpc/xprt.c
+++ b/net/sunrpc/xprt.c
@@ -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);
}
/**
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 7754aa3e434f..f5d7dcd9e8d9 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -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);
--
2.20.1
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