[pbs-devel] [PATCH proxmox-backup v3 0/6] datastore: remove config reload on hot path

[Fabian Grünbichler]

On November 20, 2025 2:03 pm, Samuel Rufinatscha wrote:
> Hi,
> 
> [..]

nit: this is getting a bit long ;)

> 
> ## Patch summary
> 
> [PATCH 1/6] partial fix #6049: config: enable config version cache for datastore
> [PATCH 2/6] partial fix #6049: datastore: impl ConfigVersionCache fast path for lookups
> [PATCH 3/6] partial fix #6049: datastore: use config fast-path in Drop
> [PATCH 4/6] partial fix #6049: datastore: add TTL fallback to catch manual config edits
> [PATCH 5/6] to add a reload flag to the config cache helper.
> [PATCH 6/6] to only bump generation when the config digest changes.
> 
> ## Changes from v2:
> 
> Added:
> - [PATCH 5/6]: Add a reload flag to the config cache helper.
> - [PATCH 6/6]: Only bump generation when the config digest changes.

please fold those into the existing version where they make sense, and
include a per-patch changelog to know *what* changed ;)

e.g., the digest part can already go into the first patch (if the
generation bumping is also moved thre from patch #4), or into patch #4.

the structural changes I suggested are missing, and I think the
readability got worse as a result since v2, we now have six instances of
checking whether there is some cache we are operating on or not..

I'll give more detailed feedback on the two new patches..

> 
> ## Maintainer notes
> 
> No dependency bumps, no API changes and no breaking changes.
> 
> Thanks,
> Samuel
> 
> [1] Bugzilla #6049: https://bugzilla.proxmox.com/show_bug.cgi?id=6049
> [2] cargo-flamegraph: https://github.com/flamegraph-rs/flamegraph
> [3] Bugzilla #7017: https://bugzilla.proxmox.com/show_bug.cgi?id=7017
> 
> Samuel Rufinatscha (6):
>   partial fix #6049: config: enable config version cache for datastore
>   partial fix #6049: datastore: impl ConfigVersionCache fast path for
>     lookups
>   partial fix #6049: datastore: use config fast-path in Drop
>   partial fix #6049: datastore: add TTL fallback to catch manual config
>     edits
>   partial fix #6049: datastore: add reload flag to config cache helper
>   datastore: only bump generation when config digest changes
> 
>  pbs-config/src/config_version_cache.rs |  10 +-
>  pbs-datastore/Cargo.toml               |   1 +
>  pbs-datastore/src/datastore.rs         | 232 ++++++++++++++++++++-----
>  3 files changed, 197 insertions(+), 46 deletions(-)
> 
> -- 
> 2.47.3
> 
> 
> 
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> 
>