remotephase: avoid full changelog iteration (issue5964)...
remotephase: avoid full changelog iteration (issue5964)
Changeset
88efb7d6bcb6 introduced a performance regression by triggering a
full ancestors walk.
This changeset reworks this logic so that we no longer walk down the full
changelog. The motivation for 88efb7d6bcb6, issue5939, is still fixed.
mercurial compared to a draft repository
----------------------------------------
8eeed92475d5: 0.012637 seconds
88efb7d6bcb6: 0.202699 seconds (x16)
46da52f4b820: 0.215551 seconds (+6%)
this code: 0.008397 seconds (-33% from base)
The payload size reduction we see in `test-bookmarks-pushpull.t` comes from a
more aggressive filter of nullid and is harmless.
