From: Chuck Lever <chuck.lever@xxxxxxxxxx>
On Mon, 18 Nov 2024 09:54:34 -0500, Jeff Layton wrote:
> nfsd currently only uses a single slot in the callback channel, which is
> proving to be a bottleneck in some cases. Widen the callback channel to
> a max of 32 slots (subject to the client's target_maxreqs value).
>
> Change the cb_holds_slot boolean to an integer that tracks the current
> slot number (with -1 meaning "unassigned"). Move the callback slot
> tracking info into the session. Add a new u32 that acts as a bitmap to
> track which slots are in use, and a u32 to track the latest callback
> target_slotid that the client reports. To protect the new fields, add
> a new per-session spinlock (the se_lock). Fix nfsd41_cb_get_slot to always
> search for the lowest slotid (using ffs()).
>
> [...]
Applied to nfsd-next for v6.13, thanks!
[1/1] nfsd: allow for up to 32 callback session slots
commit: a47e0534dc9cc3f9ee7c914cfddd6912855b5d61
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Chuck Lever
