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SUNRPC: Convert svc_xprt_release() to the release_pages() API

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Instead of invoking put_page() one-at-a-time, pass the "response"
portion of rq_pages directly to release_pages() to reduce the number
of times each nfsd thread invokes a page allocator API.

Since svc_xprt_release() is not invoked while a client is waiting
for an RPC Reply, this is not expected to directly impact mean
request latencies on a lightly or moderately loaded server. However
as workload intensity increases, I expect somewhat better
scalability: the same number of server threads should be able to
handle more work.

Reviewed-by: Calum Mackay <calum.mackay@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-04-14 20:18:02 -04:00
parent b20cb39def
commit 647a2a6428
1 changed files with 5 additions and 6 deletions
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11
net/sunrpc/svc.c
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@ -878,13 +878,12 @@ EXPORT_SYMBOL_GPL(svc_rqst_replace_page);
*/
void svc_rqst_release_pages(struct svc_rqst *rqstp)
{
while (rqstp->rq_next_page != rqstp->rq_respages) {
struct page **pp = --rqstp->rq_next_page;
int i, count = rqstp->rq_next_page - rqstp->rq_respages;
if (*pp) {
put_page(*pp);
*pp = NULL;
}
if (count) {
release_pages(rqstp->rq_respages, count);
for (i = 0; i < count; i++)
rqstp->rq_respages[i] = NULL;
}
}