[PATCH v4 3/3] NFSD: Batch release pages during splice read
From: Chuck Lever <hidden>
Date: 2021-07-12 18:58:07
Also in:
linux-mm
Subsystem:
filesystems (vfs and infrastructure), kernel nfsd, sunrpc, and lockd servers, the rest · Maintainers:
Alexander Viro, Christian Brauner, Chuck Lever, Jeff Layton, Linus Torvalds
Large splice reads call put_page() repeatedly. put_page() is relatively expensive to call, so replace it with the new svc_rqst_replace_page() helper to help amortize that cost. Signed-off-by: Chuck Lever <redacted> Reviewed-by: NeilBrown <redacted> --- fs/nfsd/vfs.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 46a6d9fce3d2..7732a384f949 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c@@ -849,15 +849,10 @@ nfsd_splice_actor(struct pipe_inode_info *pipe, struct pipe_buffer *buf, struct page *page = buf->page; if (rqstp->rq_res.page_len == 0) { - get_page(page); - put_page(*rqstp->rq_next_page); - *(rqstp->rq_next_page++) = page; + svc_rqst_replace_page(rqstp, page); rqstp->rq_res.page_base = buf->offset; } else if (page != pp[-1]) { - get_page(page); - if (*rqstp->rq_next_page) - put_page(*rqstp->rq_next_page); - *(rqstp->rq_next_page++) = page; + svc_rqst_replace_page(rqstp, page); } rqstp->rq_res.page_len += sd->len;