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

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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>
This commit is contained in:
Trond Myklebust
2019-02-18 10:02:29 -05:00
parent e9acf2105f
commit a1231fda7e
3 changed files with 17 additions and 3 deletions
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3
net/sunrpc/xprt.c
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@@ -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);
}
/**