# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2024-03-13 10:38:28
# Node ID b4a6a1ff8fce2b240f26388f2701e30f98b52fd1
# Parent  6378d57562af5416af3a4b45267e5d28aa9f6ac3

tags-cache: skip the filternode step if we are not going to use it

When warming the hgtagsfnodescache, we don't need the actual result, so we can
simply skip the part that "filter" fnode we read from the cache. So provide a
quite visible speed up to the top level `hg debugupdatecache` function.

### data-env-vars.name            = mozilla-try-2023-03-22-zstd-sparse-revlog
  # benchmark.name                = hg.debug.debug-update-cache
  # bin-env-vars.hg.flavor        = default
  # bin-env-vars.hg.py-re2-module = default
  # benchmark.variants.pre-state  = warm
before: 19.947581
after:  18.916804   (-5.17%, -1.03)

diff --git a/mercurial/tags.py b/mercurial/tags.py
--- a/mercurial/tags.py
+++ b/mercurial/tags.py
@@ -83,7 +83,9 @@ from .utils import stringutil
 def warm_cache(repo):
     """ensure the cache is properly filled"""
     unfi = repo.unfiltered()
-    fnoderevs(repo.ui, unfi, unfi.changelog.revs())
+    tonode = unfi.changelog.node
+    nodes = [tonode(r) for r in unfi.changelog.revs()]
+    _getfnodes(repo.ui, repo, nodes)
 
 
 def fnoderevs(ui, repo, revs):