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svcrdma: Replace GFP_KERNEL in a loop with GFP_NOFAIL 

At the 2015 LSF/MM, it was requested that memory allocation
call sites that request GFP_KERNEL allocations in a loop should be
annotated with __GFP_NOFAIL.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Chuck Lever 2015-06-04 11:21:20 -04:00 committed by J. Bruce Fields
parent 30b7e246a6
commit b7e0b9a965
3 changed files with 7 additions and 28 deletions
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1
include/linux/sunrpc/svc_rdma.h
View File

@ -211,7 +211,6 @@ extern int svc_rdma_sendto(struct svc_rqst *);
extern int svc_rdma_send(struct svcxprt_rdma *, struct ib_send_wr *);
extern void svc_rdma_send_error(struct svcxprt_rdma *, struct rpcrdma_msg *,
enum rpcrdma_errcode);
struct page *svc_rdma_get_page(void);
extern int svc_rdma_post_recv(struct svcxprt_rdma *);
extern int svc_rdma_create_listen(struct svc_serv *, int, struct sockaddr *);
extern struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *);

2
net/sunrpc/xprtrdma/svc_rdma_sendto.c
View File

@ -517,7 +517,7 @@ int svc_rdma_sendto(struct svc_rqst *rqstp)
inline_bytes = rqstp->rq_res.len;
/* Create the RDMA response header */
res_page = svc_rdma_get_page();
res_page = alloc_page(GFP_KERNEL | __GFP_NOFAIL);
rdma_resp = page_address(res_page);
reply_ary = svc_rdma_get_reply_array(rdma_argp);
if (reply_ary)

32
net/sunrpc/xprtrdma/svc_rdma_transport.c
View File

@ -99,12 +99,8 @@ struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
{
struct svc_rdma_op_ctxt *ctxt;
while (1) {
ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL);
if (ctxt)
break;
schedule_timeout_uninterruptible(msecs_to_jiffies(500));
}
ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep,
GFP_KERNEL | __GFP_NOFAIL);
ctxt->xprt = xprt;
INIT_LIST_HEAD(&ctxt->dto_q);
ctxt->count = 0;
@ -156,12 +152,8 @@ void svc_rdma_put_context(struct svc_rdma_op_ctxt *ctxt, int free_pages)
struct svc_rdma_req_map *svc_rdma_get_req_map(void)
{
struct svc_rdma_req_map *map;
while (1) {
map = kmem_cache_alloc(svc_rdma_map_cachep, GFP_KERNEL);
if (map)
break;
schedule_timeout_uninterruptible(msecs_to_jiffies(500));
}
map = kmem_cache_alloc(svc_rdma_map_cachep,
GFP_KERNEL | __GFP_NOFAIL);
map->count = 0;
return map;
}
@ -490,18 +482,6 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
return cma_xprt;
}
struct page *svc_rdma_get_page(void)
{
struct page *page;
while ((page = alloc_page(GFP_KERNEL)) == NULL) {
/* If we can't get memory, wait a bit and try again */
printk(KERN_INFO "svcrdma: out of memory...retrying in 1s\n");
schedule_timeout_uninterruptible(msecs_to_jiffies(1000));
}
return page;
}
int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
{
struct ib_recv_wr recv_wr, *bad_recv_wr;
@ -520,7 +500,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
pr_err("svcrdma: Too many sges (%d)\n", sge_no);
goto err_put_ctxt;
}
page = svc_rdma_get_page();
page = alloc_page(GFP_KERNEL | __GFP_NOFAIL);
ctxt->pages[sge_no] = page;
pa = ib_dma_map_page(xprt->sc_cm_id->device,
page, 0, PAGE_SIZE,
@ -1323,7 +1303,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
int length;
int ret;
p = svc_rdma_get_page();
p = alloc_page(GFP_KERNEL | __GFP_NOFAIL);
va = page_address(p);
/* XDR encode error */