> On Apr 9, 2021, at 2:05 PM, Dai Ngo <dai.ngo@xxxxxxxxxx> wrote: > > Hi Olga, > > Currently the source's export is mounted and unmounted on every > inter-server copy operation. This causes unnecessary overhead > for each copy. > > This patch series is an enhancement to allow the export to remain > mounted for a configurable period (default to 15 minutes). If the > export is not being used for the configured time it will be unmounted > by a delayed task. If it's used again then its expiration time is > extended for another period. > > Since mount and unmount are no longer done on each copy request, > this overhead is no longer used to decide whether the copy should > be done with inter-server copy or generic copy. The threshold is > now a module configuration parameter, default to 16MB. > > -Dai > > v2: fix compiler warning of missing prototype. > v3: remove the used of semaphore. > eliminated all RPC calls for subsequence mount by allowing > all exports from one server to share one vfsmount. > make inter-server threshold a module configuration parameter. This series is close, but it doesn't seem 100% ready yet. Let's defer it for the next merge window to give a little more time for review, testing, and discussion. -- Chuck Lever
