| Message ID | 20210409180519.25405-1-dai.ngo@oracle.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | NFSD: delay unmount source's export after inter-server copy completed. | expand |
> On Apr 9, 2021, at 2:05 PM, Dai Ngo <dai.ngo@oracle.com> 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
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.