As with the page allocation side, I'm trying to reduce the average
number of times NFSD invokes the page allocation and release APIs
because they can be expensive, and because it is a resource that is
shared amongst all nfsd threads and thus access to it is at least
partially serialized. This small series tackles a code path that is
frequently invoked when NFSD handles READ operations on local
filesystems that support splice (i.e., most of the popular ones).

Changes since v3:
- Mark patches 1 and 3 as Reviewed-by: Neil Brown
- Convert bare release_pages() calls to pagevec_release()
- Release accrued free pages after every RPC retires

---

Chuck Lever (3):
      NFSD: Clean up splice actor
      SUNRPC: Add svc_rqst_replace_page() API
      NFSD: Batch release pages during splice read


 fs/nfsd/vfs.c              | 20 +++++---------------
 include/linux/sunrpc/svc.h |  4 ++++
 net/sunrpc/svc.c           | 21 +++++++++++++++++++++
 net/sunrpc/svc_xprt.c      |  3 +++
 4 files changed, 33 insertions(+), 15 deletions(-)

--
Chuck Lever