[code sync] Merge code from sonic-net/sonic-utilities:202511 to 202512 - #452
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Sep 10, 2026
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* Merge pull request #3831 from bhouse-nexthop/bhouse-nexthop/gcu-perf Generic Configuration Updater (GCU) performance enhancements Generic Configuration Updater is extremely slow, using the python profiler it was possible to determine the worst offenders where changes could be made without affecting the overall algorithm and HLD design documentation. Brief overview of changes: * Prevent copy.deepcopy() calls where possible * Don't run validation twice back to back * Move configdb path <> xpath conversion logic to sonic-yang-mgmt where it belongs and enhance it to support schema conversion (not just data) and add caching. * Sort table keys by the number of schema backlinks and must statements for the node to try better guess the right order of the patches to generate rather than doing it in alphabetical order which is likely to cause validation failures. * Add ability to Group patches together in some commits where its known they will not cause issues, these are things like grouping parameter updates under the same key. * When applying changes, do not re-read the configuration from redis twice between each applied patch (this is **extremely** slow, and actually hid a race condition). We are mutating the configuration and a lock is held so we know the expected before and after. There is still a final validation to ensure something didn't go sideways. Dependencies: * sonic-yang-mgmt enhancements: sonic-net/sonic-buildimage#22254 * sonic-yang-mgmt parse uses/grouping: sonic-net/sonic-buildimage#21907 * sonic-utilities rely on sonic-yang-mgmt uses/grouping handling: sonic-net/sonic-utilities#3814 Stats below ... (stats need both this and the sonic-utilities PR to be relevant)... <ins>**Original Performance:**</ins> Dry Run: ``` time sudo config replace -d ./config_db.json ... real 2m51.588s user 2m23.777s sys 0m25.300s ``` Full: ``` time sudo config replace ./config_db.json ... real 14m53.772s user 12m2.376s sys 2m8.908s ``` <ins>**With Patch**:</ins> Dry Run: ``` time sudo config replace -d ./config_db.json ... real 0m59.602s user 0m56.434s sys 0m2.110s ``` Full: ``` time sudo config replace ./config_db.json ... real 1m54.303s user 0m58.482s sys 0m2.545s ``` So that's roughly 3x improvement for dry-run, and 7.5x improvement for full commit. There is room for improvement on the full commit due to a `sleep(1)` being used between each patch because of a race condition found in the prior code (that was hidden due to a costly sanity check that has been removed). (cherry picked from commit bd3de9d) Signed-off-by: rimunagala <rimunagala@microsoft.com> * [GCU] Make find_ref_paths load YANG data when nothing is loaded (202511-only) 202511-only hardening. Not required on master. PR #3831 adds a `reload_config` gate to PathAddressing.find_ref_paths() so that bulk operations skip redundant sy.loadData() calls: if reload_config: sy.loadData(config) That gate was authored against master's tree, where PR #4118 ("Remove direct dependency on libyang", 2026-04-27) had already deleted _get_inner_leaf_xpaths() and with it the only sy.root dereference in this function. On master, skipping the load is therefore harmless by construction. 202511 does not contain #4118 and retains _get_inner_leaf_xpaths(), which does: nodes = sy.root.find_path(xpath).data() so on this branch find_ref_paths() depends on YANG data already being loaded. That requirement is satisfied today only by statement ordering: every caller (patch_sorter.py:757, 991, 1687) seeds reload_config=True and flips it to False only after the first call has loaded. sy is a process-lifetime singleton (create_sonic_yang_with_loaded_models() calls loadYangModel() once and never loadData()), so sy.root is None only before the first-ever load in the process. The invariant holds today, but it is implicit, undocumented, and not something master has any reason to preserve. Any future reordering, new caller, or new move generator that reaches a reload_config=False call site first would fail with AttributeError: 'NoneType' object has no attribute 'find_path'. Make the requirement explicit instead of relying on call order: if reload_config or sy.root is None: The #4476 config-hash caching is preserved, so redundant loads are still skipped. No behavioural change is expected or observed. On cisco-8000 (56 ports, 6 ACL tables) the pre-fix and post-fix patched arms are equal within noise -- 0.74/0.75/14.31/2.00s vs 0.73/0.76/14.09/2.11s -- with identical move counts. 460 unit tests + 81 subtests pass. NOTE: this change is defensive. No production failure has been reproduced. An instrumented end-to-end sort() of a create-only PORT lanes change on a port referenced by an ACL ports leaf-list reaches the reload_config=False sites only after a load has already happened, and behaves identically with and without this change. The alternative -- backporting #4118 -- was evaluated and rejected: it touches config/config_mgmt.py and sonic_package_manager/manager.py and adds a semgrep CI gate, all outside the GCU-only scope agreed for this backport. Signed-off-by: rimunagala <rimunagala@microsoft.com> --------- Signed-off-by: rimunagala <rimunagala@microsoft.com> Co-authored-by: Guohan Lu <lguohan@gmail.com>
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