log: restore cache used by --copies
The {filelog -> linkrev -> copyfrom} cache was refactored and broken by:
changeset: 10060:
f780b1098efc
user: Patrick Mezard <pmezard@gmail.com>
date: Sun Dec 13 18:06:24 2009 +0100
summary: templatekw: change {file_copies} behaviour, add
{file_copies_switch}
With --copies, this cache is accessed for every touched file of every revision.
Unfortunately it is recreated for every revision, which means filelogs are
parsed again. This patch makes the cache global again for all revisions.
A couple of indicative timings of "hg log --copies", before and after:
hg: 44s / 5s
mozilla --limit 10000: 3m51s / 2m32s
mozilla: 23m46s / 12m23s
I do not know any good tool to trace memory consumption of these runs for
comparisons. Watching the full mozilla run in top, the process did not seem to
misbehave.
graphlog: implement --follow-first
log --graph --follow-first FILE cannot be compared with the regular version
because it never worked: --follow-first is not taken in account in
walkchangerevs() fast path and is explicitely bypassed in FILE case in
walkchangerevs() nested iterate() function.