Is there a way to make Cephfs kernel client to send data to Ceph cluster smoothly with buffer io

[Sage Meng <lkkey80@xxxxxxxxx>]

Hi All,

      Cephfs kernel client is influenced by kernel page cache when we
write data to it,  outgoing data will be huge when os starts to flush
page cache. So Is there a way to make Cephfs kernel client to send
data to ceph cluster smoothly when buffer io is used ? Better a way
that only influence Ceph IO not the whole system IO.