ancestor: unroll loop of parents in _lazyancestorsiter() This change itself isn't major performance win, but it helps optimizing the visit loop for contiguous chains. See the next patch.

ancestor: return early from _lazyancestorsiter() when reached to stoprev There's no need to empty the heap.

ancestor: remove alias of initrevs from _lazyancestorsiter() It's just redundant and less comprehensible.

narrow: validate patterns returned by expandnarrow Remotes could supply malicious or invalid patterns. We should validate them as soon as possible. Differential Revision: https://phab.mercurial-scm.org/D4523

narrowspec: limit patterns to path: and rootfilesin: (BC) Some matcher patterns are computationally expensive and may even have security issues (e.g. evaluating some file sets). For these reasons, we want to limit the types of matcher patterns that can be used in narrow specs and by command line arguments used for defining narrow specs. This commit teaches ``narrowspec.parsepatterns()`` to validate the pattern types against "safe" patterns. Surprisingly, no existing tests broke. So tests for the feature have been added. We also added a function to validate a patterns data structure. This will be used in future commits. Differential Revision: https://phab.mercurial-scm.org/D4522

narrow: mark wire proto capability names experimental and versioned We already plan to add a "widen" wire protocol command to the "narrow" capability, so let's version the capabilities as "exp-narrow-1" and "exp-ellipses-1". When we add the "widen" command, we will then add a "exp-narrow-2" capability to indicate support for that command. Differential Revision: https://phab.mercurial-scm.org/D4529

narrow: move wire proto capabilities to narrowwirepeer These are not bundle2 capabilities (they just happened to share the name "narrow"), so they seem to belong with the wirepeer overrides. Differential Revision: https://phab.mercurial-scm.org/D4528

narrow: check "narrow" wire protocol capability, not bundle2 capability It seems like the new "narrow" wire protocol capability should be what determines if the server supports the "narrow" and "{,old}{in,ex}cludepats" arguments to the getbundle request. Differential Revision: https://phab.mercurial-scm.org/D4527

sparse: add local files to temporaryfiles if they exist out of sparse We get the f1 from args if it's merge and check that whether that exists in sparse checkout or not. If that does not, we add that for merging. The error comes from very low-level where we try to read data of a working-filectx which does not exists in the working directory. It will be extremely ugly to plug in logic to update sparse copy with new file at such a low level. We already have logic related to updating the checkout with required files in calculateupdates() and let's handle this case there only. calculateupdates() call sparse.filterupdatesactions() and the logic is added into the latter function. To get the exact traceback, this patch can be backed out and test-sparse-merges.t can be run with ui.traceback=True. Differential Revision: https://phab.mercurial-scm.org/D4341

tests: show that merging with sparse is broken when rename is involved This patch adds test to show that merging with sparse is broken when you have a rename on one side and just modification on another side. Differential Revision: https://phab.mercurial-scm.org/D4340

narrowspec: fix a typoed 'supported' Spotted by martinvonz. Differential Revision: https://phab.mercurial-scm.org/D4374

narrow: build the known set of nodes only when ellipses is enabled We don't need to build the known set in non-ellipses case because we don't have a shallow repo. In this patch, this checks whether the server has ellipses enabled or not using the server capability and then build the known set of nodes. Building the known set of nodes can take ~3-4 minutes on repositories with millions of csets so this patch speeds up extending a non-shallow narrow clone on large repositories. In future, we should first check whether local repository is an ellipses repo using a new ellipses repo requirement and then control all the combinations between local repo requirement and server capability. Differential Revision: https://phab.mercurial-scm.org/D4520

narrow: add narrow and ellipses as server capabilities Right now we don't have a way to differentiate between whether a server can serve ellipsis or not. The way we check whether a server is narrow enabled is by checking bundle2 capability which does not scale outside of bundle2 world. The goal is to use have wireprotocol commands just like remotefilelog for widening the narrow clone, atleast in non-ellipses cases. Having a server capability will help there as we can't rely on bundle2 capability there. Also having a server capability is neat than having a bundle2 capability. There are lot of things we can optimize locally on the client side by knowing before hand that whether the server supports ellipses or not. This will also help us in making sure that a client ellipses repo does not communicate with a server repo without ellipses. Differential Revision: https://phab.mercurial-scm.org/D4521

treemanifest: use visitchildrenset when doing a walk For this series, starting at 'introduce lazy loading of subdirs' and ending with this commit, we get the following timing numbers, using roughly the same methodology and setup that we did in an earlier commit. "before" is 6268fed3. diff --git: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 1.585 s +- 0.034 s | 1.574 s +- 0.045 s | 99.3% m-u | | x | 1.591 s +- 0.024 s | 1.601 s +- 0.034 s | 100.6% m-u | x | | 1.579 s +- 0.032 s | 1.603 s +- 0.029 s | 101.5% m-u | x | x | 109.8 ms +- 2.1 ms | 108.8 ms +- 2.2 ms | 99.1% l-d-r | | | 234.6 ms +- 5.1 ms | 240.1 ms +- 7.9 ms | 102.3% l-d-r | | x | 238.3 ms +- 8.1 ms | 232.2 ms +- 6.3 ms | 97.4% l-d-r | x | | 120.0 ms +- 2.7 ms | 119.6 ms +- 2.1 ms | 99.7% l-d-r | x | x | 120.2 ms +- 1.6 ms | 119.1 ms +- 1.6 ms | 99.1% diff -c . --git: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 356.9 ms +- 5.6 ms | 355.9 ms +- 5.6 ms | 99.7% m-u | | x | 209.1 ms +- 3.3 ms | 205.8 ms +- 2.6 ms | 98.4% m-u | x | | 418.3 ms +- 14.0 ms | 350.8 ms +- 7.7 ms | 83.9% <-- m-u | x | x | 168.3 ms +- 1.5 ms | 168.1 ms +- 2.7 ms | 99.9% l-d-r | | | 100.5 ms +- 2.1 ms | 99.1 ms +- 1.6 ms | 98.6% l-d-r | | x | 5.672 s +- 0.133 s | 4.335 s +- 0.051 s | 76.4% <-- l-d-r | x | | 102.8 ms +- 2.8 ms | 100.4 ms +- 1.7 ms | 97.7% l-d-r | x | x | 1.025 s +- 0.028 s | 875.9 ms +- 12.1 ms | 85.5% <-- rebase -r . --keep -d .^^: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 6.654 s +- 0.137 s | 6.718 s +- 0.046 s | 101.0% m-u | | x | 6.672 s +- 0.104 s | 6.716 s +- 0.143 s | 100.7% m-u | x | | 6.661 s +- 0.072 s | 6.658 s +- 0.066 s | 100.0% m-u | x | x | 696.0 ms +- 49.0 ms | 696.2 ms +- 54.8 ms | 100.0% l-d-r | | | 789.1 ms +- 12.5 ms | 793.5 ms +- 17.3 ms | 100.6% l-d-r | | x | 7.621 s +- 0.194 s | 7.144 s +- 0.116 s | 93.7% <-- l-d-r | x | | 335.4 ms +- 9.7 ms | 339.6 ms +- 10.8 ms | 101.3% l-d-r | x | x | 6.315 s +- 0.085 s | 5.633 s +- 0.105 s | 89.2% <-- status --change . --copies: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 331.2 ms +- 7.0 ms | 335.1 ms +- 6.5 ms | 101.2% m-u | | x | 184.0 ms +- 3.8 ms | 183.1 ms +- 3.4 ms | 99.5% m-u | x | | 330.5 ms +- 7.2 ms | 332.7 ms +- 6.9 ms | 100.7% m-u | x | x | 148.7 ms +- 3.5 ms | 147.5 ms +- 2.2 ms | 99.2% l-d-r | | | 97.3 ms +- 1.3 ms | 98.2 ms +- 2.5 ms | 100.9% l-d-r | | x | 5.196 s +- 0.030 s | 4.281 s +- 0.025 s | 82.4% <-- l-d-r | x | | 101.4 ms +- 3.1 ms | 100.9 ms +- 1.8 ms | 99.5% l-d-r | x | x | 1.015 s +- 0.018 s | 861.2 ms +- 11.2 ms | 84.8% <-- status --copies: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 2.356 s +- 0.032 s | 2.369 s +- 0.027 s | 100.6% m-u | | x | 2.371 s +- 0.041 s | 2.385 s +- 0.028 s | 100.6% m-u | x | | 2.366 s +- 0.036 s | 2.379 s +- 0.030 s | 100.5% m-u | x | x | 121.8 ms +- 3.8 ms | 121.1 ms +- 2.7 ms | 99.4% l-d-r | | | 726.2 ms +- 12.9 ms | 723.1 ms +- 12.7 ms | 99.6% l-d-r | | x | 738.7 ms +- 11.2 ms | 741.3 ms +- 11.1 ms | 100.4% l-d-r | x | | 215.9 ms +- 3.6 ms | 214.7 ms +- 5.9 ms | 99.4% l-d-r | x | x | 213.1 ms +- 2.5 ms | 212.8 ms +- 4.5 ms | 99.9% update $rev^; ~/src/hg/hg{hg}/hg update $rev: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 3.922 s +- 0.045 s | 3.937 s +- 0.034 s | 100.4% m-u | | x | 3.673 s +- 0.028 s | 3.660 s +- 0.035 s | 99.6% m-u | x | | 3.959 s +- 0.073 s | 3.904 s +- 0.051 s | 98.6% m-u | x | x | 417.0 ms +- 13.0 ms | 406.2 ms +- 6.5 ms | 97.4% l-d-r | | | 534.3 ms +- 12.2 ms | 537.9 ms +- 8.8 ms | 100.7% l-d-r | | x | 10.671 s +- 0.275 s | 10.111 s +- 0.114 s | 94.8% <-- l-d-r | x | | 309.7 ms +- 3.5 ms | 307.9 ms +- 4.0 ms | 99.4% l-d-r | x | x | 1.837 s +- 0.014 s | 1.887 s +- 0.035 s | 102.7% Differential Revision: https://phab.mercurial-scm.org/D4371

treemanifest: use visitchildrenset when filtering a manifest to a matcher Differential Revision: https://phab.mercurial-scm.org/D4370

tests: stabilize test-no-symlink This goes with 89630d0b3e23.

shelve: use the internal phase when possible If the repository support it, use the internal phase for all changesets created by shelve.

treemanifest: avoid loading everything just to get their nodeid Differential Revision: https://phab.mercurial-scm.org/D4369

treemanifest: avoid unnecessary copies/processing when using alwaysmatcher Differential Revision: https://phab.mercurial-scm.org/D4368

treemanifest: attempt to avoid loading all lazily-loaded subdirs in _isempty Differential Revision: https://phab.mercurial-scm.org/D4367

treemanifest: introduce lazy loading of subdirs An earlier patch series made it so that what to load was up to the calling code, which works fine until manifests are copied - when they're copied, they're loaded completely and thus we lose the entire benefit. By lazy loading everything, we can avoid having to pass in the matcher to ~every manifest function, and handle copies correctly as well. This changeset doesn't go as far as it could with loading only the necessary subsets, that will happen in later changes in this series; at the moment, except in a few situations, we just load everything the moment we want to interact with treemanifest._dirs. This is thus most likely to be a small slowdown if treemanifests is in use regardless of whether narrow is in use, but hopefully easier to verify correctness and review. This is part of a series of speedups, it is not expected to produce any real speed improvements itself, but the numbers show that it doesn't produce a large speed penalty in any common case, and for the cases it does provide a penalty in, it is not a large absolute amount (even if it is a large percentage amount). Timing numbers according to command: hyperfine --prepare <preparation_script> 'hg status' HGRCPATH points to a file with the following contents: [extensions] narrow = strip = rebase = mozilla-unified (called m-u below) was at revision #468856. regular hash: eb39298e432d treemanifests hash: 0553b7f29eaf large-dir-repo (called l-d-r below) was generated with the following script: #!/bin/bash hg init large-dir-repo mkdir -p large-dir-repo/third_party/rust/log touch large-dir-repo/third_party/rust/log/foo.txt for i in $(seq 1 30000); do d=$(mktemp -d large-dir-repo/third_party/XXXXXXXXX) touch $d/file.txt done hg -R large-dir-repo ci -Am 'rev0' --user test --date '0 0' echo hi > large-dir-repo/third_party/rust/log/bar.txt hg -R large-dir-repo ci -Am 'rev1' --user test --date '0 0' echo hi > large-dir-repo/third_party/rust/log/baz.txt hg -R large-dir-repo ci -Am 'rev2' --user test --date '0 0' for the repos that use narrow, the narrowspec was this: [include] rootfilesin:accessible/jsat rootfilesin:accessible/tests/mochitest/jsat rootfilesin:mobile/android/chrome/content rootfilesin:mobile/android/modules/geckoview rootfilesin:third_party/rust/log [exclude] This narrowspec was chosen due to the size of the third_party/rust directory (this directory was *not* modified in revision #468856 in mozilla-unified), plus all the directories that *were* modified in revision #468856 of mozilla-unified. Importantly, when using narrow, these repos had everything checked out (in the case of large-dir-repo, that means all 30,001 directories), *before* adding the narrowspec. This is to simulate the behavior when using a virtual filesystem that shows everything for the user even if they haven't added it to the narrowspec yet. This is not a supported configuration, and `hg update` and `hg rebase` will not really do the "correct" thing if there are mutations outside of the narrowspec (which is not the case in these tests, due to a carefully crafted narrowspec), but non-mutating commands should behave correctly. I'm not claiming anything less than a 5% speed win as improvements due to this change; these are probably eiter measurement artifacts or constant time improvements. The numbers that aren't changing are shown primarily to prove that this doesn't make anything worse in any case I plan on testing during this series. 'before' is hg from commit 6268fed3 'N' indicates narrow in use 'T' indicates treemanifest in use Please note that these commands and the narrowspec are a little different than the ones in a similar table that I made in a3cabe9415e1. Important: it is my understanding that these numbers below are *not super reliable*, the large slowdowns may be artifacts of some odd interaction between GC and python module/code complexity. Another changeset of mine (D4351) had shown large timing differences when ~empty, uncalled functions were added to match.py, though only when using --color=never or redirecting to /dev/null. We seem to be on some cusp of complexity or code size that is causing, at my best guess (according to linux `perf` benchmarks) GC to alter behavior and cause a 200-400ms difference in timings. I haven't had a chance to replicate these results on another machine. diff --git: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 1.580 s +- 0.034 s | 1.576 s +- 0.022 s | 99.7% m-u | | x | 1.568 s +- 0.025 s | 1.584 s +- 0.044 s | 101.0% m-u | x | | 1.569 s +- 0.031 s | 1.554 s +- 0.025 s | 99.0% m-u | x | x | 107.3 ms +- 1.6 ms | 106.3 ms +- 1.5 ms | 99.1% l-d-r | | | 232.5 ms +- 5.9 ms | 233.5 ms +- 5.3 ms | 100.4% l-d-r | | x | 236.6 ms +- 6.3 ms | 233.6 ms +- 7.0 ms | 98.7% l-d-r | x | | 118.4 ms +- 2.1 ms | 118.4 ms +- 1.4 ms | 100.0% l-d-r | x | x | 116.8 ms +- 1.5 ms | 118.9 ms +- 1.6 ms | 101.8% diff -c . --git: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 354.4 ms +- 16.6 ms | 351.0 ms +- 6.9 ms | 99.0% m-u | | x | 207.2 ms +- 3.0 ms | 206.2 ms +- 2.7 ms | 99.5% m-u | x | | 422.0 ms +- 26.0 ms | 351.2 ms +- 6.4 ms | 83.2% <-- m-u | x | x | 166.7 ms +- 2.1 ms | 169.5 ms +- 4.1 ms | 101.7% l-d-r | | | 98.4 ms +- 4.5 ms | 98.5 ms +- 2.1 ms | 100.1% l-d-r | | x | 5.519 s +- 0.060 s | 5.149 s +- 0.042 s | 93.3% <-- l-d-r | x | | 99.1 ms +- 3.2 ms | 102.6 ms +- 9.7 ms | 103.5% <--? l-d-r | x | x | 994.9 ms +- 10.7 ms | 1.026 s +- 0.012 s | 103.1% <--? rebase -r . --keep -d .^^: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 6.639 s +- 0.168 s | 6.559 s +- 0.097 s | 98.8% m-u | | x | 6.601 s +- 0.143 s | 6.640 s +- 0.207 s | 100.6% m-u | x | | 6.582 s +- 0.098 s | 6.543 s +- 0.098 s | 99.4% m-u | x | x | 678.4 ms +- 57.7 ms | 703.7 ms +- 52.4 ms | 103.7% <--? l-d-r | | | 780.0 ms +- 23.9 ms | 776.0 ms +- 12.6 ms | 99.5% l-d-r | | x | 7.520 s +- 0.255 s | 7.395 s +- 0.044 s | 98.3% l-d-r | x | | 331.9 ms +- 16.5 ms | 327.0 ms +- 3.4 ms | 98.5% l-d-r | x | x | 6.228 s +- 0.113 s | 5.924 s +- 0.044 s | 95.1% status --change . --copies: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 330.8 ms +- 7.2 ms | 329.0 ms +- 7.1 ms | 99.5% m-u | | x | 182.9 ms +- 2.7 ms | 183.5 ms +- 2.7 ms | 100.3% m-u | x | | 330.0 ms +- 7.6 ms | 327.1 ms +- 5.4 ms | 99.1% m-u | x | x | 146.2 ms +- 2.4 ms | 147.1 ms +- 1.3 ms | 100.6% l-d-r | | | 95.3 ms +- 1.4 ms | 95.9 ms +- 1.5 ms | 100.6% l-d-r | | x | 5.157 s +- 0.035 s | 5.166 s +- 0.058 s | 100.2% l-d-r | x | | 99.7 ms +- 3.0 ms | 100.2 ms +- 4.4 ms | 100.5% l-d-r | x | x | 993.6 ms +- 13.1 ms | 1.025 s +- 0.015 s | 103.2% <--? status --copies: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 2.348 s +- 0.031 s | 2.329 s +- 0.019 s | 99.2% m-u | | x | 2.337 s +- 0.026 s | 2.346 s +- 0.034 s | 100.4% m-u | x | | 2.354 s +- 0.015 s | 2.342 s +- 0.021 s | 99.5% m-u | x | x | 120.6 ms +- 4.3 ms | 119.2 ms +- 2.1 ms | 98.8% l-d-r | | | 731.5 ms +- 11.1 ms | 719.6 ms +- 9.8 ms | 98.4% l-d-r | | x | 729.0 ms +- 15.5 ms | 725.7 ms +- 10.6 ms | 99.5% l-d-r | x | | 211.0 ms +- 3.9 ms | 212.8 ms +- 3.7 ms | 100.9% l-d-r | x | x | 211.5 ms +- 4.2 ms | 211.0 ms +- 3.3 ms | 99.8% update $rev^; ~/src/hg/hg{hg}/hg update $rev: repo | N | T | before (mean +- stdev) | after (mean +- stdev) | % of before ------+---+---+------------------------+-----------------------+------------ m-u | | | 3.910 s +- 0.055 s | 3.920 s +- 0.075 s | 100.3% m-u | | x | 3.613 s +- 0.056 s | 3.630 s +- 0.056 s | 100.5% m-u | x | | 3.873 s +- 0.055 s | 3.864 s +- 0.049 s | 99.8% m-u | x | x | 400.4 ms +- 7.4 ms | 403.6 ms +- 5.0 ms | 100.8% l-d-r | | | 531.6 ms +- 10.0 ms | 528.8 ms +- 9.6 ms | 99.5% l-d-r | | x | 10.377 s +- 0.049 s | 9.955 s +- 0.046 s | 95.9% l-d-r | x | | 308.3 ms +- 4.4 ms | 306.8 ms +- 3.7 ms | 99.5% l-d-r | x | x | 1.805 s +- 0.015 s | 1.834 s +- 0.020 s | 101.6% Differential Revision: https://phab.mercurial-scm.org/D4366

contrib: use a monotonic timer in catapipe As spotted by Gregory, we should use a monotonic timer to get better timings. Differential Revision: https://phab.mercurial-scm.org/D4516

contrib: fix catapipe output argument documentation Differential Revision: https://phab.mercurial-scm.org/D4515

tracing: trace command function execution Differential Revision: https://phab.mercurial-scm.org/D4514

extension: add a summary of total loading time per extension Differential Revision: https://phab.mercurial-scm.org/D4513

extensions: trace the total time of running all reposetup callbacks Differential Revision: https://phab.mercurial-scm.org/D4512

extensions: trace the total time of running all extsetup callbacks Differential Revision: https://phab.mercurial-scm.org/D4511

extensions: trace the total time of running all uisetup callbacks Differential Revision: https://phab.mercurial-scm.org/D4510