Mercurial > hg
view mercurial/revlogutils/constants.py @ 40979:ba09db267cb6
delta: ignore base whose chains already don't match expectations
If we know the existing chain does not match our criteria, there is no point
to build a delta to append. This is especially useful when dealing with a full
text much smaller than its parent. In that case, the parent chain is probably
already too large.
example affected manifest write
before: 1.421005s
after: 0.815520s (-42%)
author | Boris Feld <boris.feld@octobus.net> |
---|---|
date | Mon, 17 Dec 2018 10:46:37 +0100 |
parents | 8e398628a3f2 |
children | e7a2cc84dbc0 |
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# revlogdeltas.py - constant used for revlog logic # # Copyright 2005-2007 Matt Mackall <mpm@selenic.com> # Copyright 2018 Octobus <contact@octobus.net> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """Helper class to compute deltas stored inside revlogs""" from __future__ import absolute_import from .. import ( repository, util, ) # revlog header flags REVLOGV0 = 0 REVLOGV1 = 1 # Dummy value until file format is finalized. # Reminder: change the bounds check in revlog.__init__ when this is changed. REVLOGV2 = 0xDEAD FLAG_INLINE_DATA = (1 << 16) FLAG_GENERALDELTA = (1 << 17) REVLOG_DEFAULT_FLAGS = FLAG_INLINE_DATA REVLOG_DEFAULT_FORMAT = REVLOGV1 REVLOG_DEFAULT_VERSION = REVLOG_DEFAULT_FORMAT | REVLOG_DEFAULT_FLAGS REVLOGV1_FLAGS = FLAG_INLINE_DATA | FLAG_GENERALDELTA REVLOGV2_FLAGS = REVLOGV1_FLAGS # revlog index flags # For historical reasons, revlog's internal flags were exposed via the # wire protocol and are even exposed in parts of the storage APIs. # revision has censor metadata, must be verified REVIDX_ISCENSORED = repository.REVISION_FLAG_CENSORED # revision hash does not match data (narrowhg) REVIDX_ELLIPSIS = repository.REVISION_FLAG_ELLIPSIS # revision data is stored externally REVIDX_EXTSTORED = repository.REVISION_FLAG_EXTSTORED REVIDX_DEFAULT_FLAGS = 0 # stable order in which flags need to be processed and their processors applied REVIDX_FLAGS_ORDER = [ REVIDX_ISCENSORED, REVIDX_ELLIPSIS, REVIDX_EXTSTORED, ] REVIDX_KNOWN_FLAGS = util.bitsfrom(REVIDX_FLAGS_ORDER) # bitmark for flags that could cause rawdata content change REVIDX_RAWTEXT_CHANGING_FLAGS = REVIDX_ISCENSORED | REVIDX_EXTSTORED SPARSE_REVLOG_MAX_CHAIN_LENGTH = 1000