perf: use standard arguments for perfrevlog We have a convention of using -c|-m|FILE elsewhere for reading from revlogs. Use it for `hg perfrevlog`. While I was here, I also added a docstring to document what this command does, as "perfrevlog" is ambiguous.

test-extension: do not depend on demandimport (issue5012) When demandimport is disabled, the test will fail because extroot/foo.py uses import outside PYTHONPATH. This is bad since we have a PyPy migration plan and it does not support demandimport. Fix by setting PYTHONPATH.

commands: split notes into note containers

remove: quote --force in never deletes note Split Note into a note container

import: reword no hunks partial note Split Note into a note container

merge: reword help to use See help resolve

py3compat: use absolute_import

patch: use absolute_import

mdiff: use absolute_import

scmposix: use absolute_import

scmutil: use absolute_import

scmwindows: use absolute_import

store: use absolute_import

help: use absolute_import

test-commit-interactive: updates for the no-execbit case This goes with c84a07530040 and 14b184263846.

test-fileset: conditionalize output with symlink

commands: the first word of each note should be capital or `hg`

revlog: avoid string slice when decompressing u* chunks Revlog chunks can be stored uncompressed. If the first byte of the raw data is \0, we store the data as is. Else we prefix it with 'u'. Before, we performed a string slice to strip out the 'u' prefix. With this patch, we use a buffer to avoid an extra memory copy and associated garbage collection overhead. I was unable to verify any performance impact of this patch. For both mozilla-central and the hg repos, the number of manifest revisions with 'u' prefixes is very small - under 1%. So this change likely isn't called enough to have an impact on manifest reading. However, the reasoning behind this change is solid, so it should be safe.

osutil: implement pure version of recvfds() for PyPy This is less portable than the C version, but PyPy can't load CPython extensions. So for now, this will be used on PyPy. I've tested it on Linux amd64 and Mac OS X.

osutil: implement recvmsg() of SCM_RIGHTS for chg command server It will be used to attach client's stdio files to a background chg command server. The socket module of Python 2.x doesn't provide recvmsg(). This could be implemented by using ctypes, but it would be less portable than the C version because the handling of socket ancillary data heavily depends on preprocessor. Also, some length fields are wrongly typed in the Linux kernel.

cleanup: back out performance hacks amended into previous commit

commands: consistently indent notes 3 spaces most notes have 3 spaces for indentation, these had 2...

perf: add perfrevlogrevision As part of investigating performance improvements to revlog reading, I needed a mechanism to measure every part of revlog reading so I knew where time was spent and how effective optimizations were. This patch implements a perf command for benchmarking the various stages of reading a single revlog revision. When executed against a manifest revision at the end of a 30,000+ long delta chain in mozilla-central, the command demonstrates that ~80% of time is spent in zlib decompression.

commands: use revlog._deltachain in debugdeltachain We have a nice API now. Use it. This does mean we introduce an extra index lookup for each revision. Considering this is a debug command, the overhead should be acceptable. We could add the chain size to revlog._deltachain(). However, that feels like avoidable overhead.

revlog: refactor delta chain computation into own function This code is already written in multiple locations. While this code needs to be fast and extracting it to its own function adds overhead, code paths reading delta chains typically read, decompress, and do binary patching on revlog data from the delta chain. This other work (especially zlib decompression) almost certainly accounts for a lot more time than the overhead of introducing a Python function call. So I'm not worried about the performance impact of this change.

perf: call clearcaches() in perfmanifest The old code only partially cleared the caches. Now that we have a comprehensive method for wiping all caches, let's call it. This appears to introduce a marginal regression in `hg perfmanifest` on mozilla-central. This is good because the new result is more accurate since caches aren't being used.

manifest: implement clearcaches() The manifest implements its own caches in addition to revlog's. Extend the base clearcaches() to wipe these as well.

revlog: make clearcaches() more effective clearcaches() was added several years ago in e8d37b78acfb as part of implementing a perf command. Since revlog instances have many caches and since the spirit of this mostly unused method is to facilitate performance testing, I think it's appropriate for all the revlog's caches to get cleared when it is called.