revlogutils: teach
issue6528 filtering about grandparents
During dynamic filtering, we should assume that the current repository
is correct. Therefore the parents of the delta base can tell us if that
parent has metadata without having to build the whole text.
revlogutils: remember known metadata parents for
issue6528
In the cases where the parent revs tell us for sure that the parent has
metadata, remember this fact to avoid content recomputations later.
revlogutils: for
issue6528 fix, pre-cache nullrev as metadata-free
revlogutils: for
issue6528 fix, cache results for null changes
revlogutils: fix _chunk() reference
_chunk is only found in the inner revlog object and not directly exposed
outside.
rev-branch-cache: reenable memory mapping of the revision data
Now that we are no longer truncating it, we can mmap it again.
This provide a sizeable speedup on repository with a very large amount of
revision for example for a mozilla-try clone with 5 793 383 revisions, this
provide a speedup of 5ms - 10ms. Since they happens within the "critical" locked
path during push. These miliseconds are important.
In addition, the v3 branchmap format is use the rev-branch-cache more than the
v2 branchmap cache so this will be important.
On smaller repository we consistently see an improvement of one or two percents,
but the gain in absolute time is usually < 10 ms.
#### benchmark.name = hg.command.unbundle
# benchmark.variants.
issue6528 = disabled
# benchmark.variants.reuse-external-delta-parent = yes
# benchmark.variants.revs = any-1-extra-rev
# benchmark.variants.source = unbundle
# benchmark.variants.verbosity = quiet
### data-env-vars.name = mozilla-try-2024-03-26-zstd-sparse-revlog
## bin-env-vars.hg.flavor = default
e51161b12c7e: 3.527923
ebdcfe85b070: 3.468178 (-1.69%, -0.06)
## bin-env-vars.hg.flavor = rust
e51161b12c7e: 3.580158
ebdcfe85b070: 3.480564 (-2.78%, -0.10)
### data-env-vars.name = mozilla-try-2024-03-26-ds2-pnm
## bin-env-vars.hg.flavor = rust
e51161b12c7e: 3.527923
ebdcfe85b070: 3.468178 (-1.69%, -0.06)
rev-branch-cache: have debugupdatecache warm rbc too
Since the "v2" format can be more performant than the "v1" format (thanks to
mmap), it is useful to be able to make sure it is present