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manifest: use a size 3 LRU cache to store parsed manifests...

manifest: use a size 3 LRU cache to store parsed manifests Previously, the manifest cache would store the last manifest parsed. We could run into situations with operations like update where we would try parsing the manifest for a revision r1, then r2, then r1 again. This increases the cache size to 3 to avoid that bit of performance fragility.

Bryan O'Sullivan - - Load All Authors

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      http://mercurial.selenic.com/bts/issue522

      In the merge below, the file "foo" has the same contents in both

      parents, but if we look at the file-level history, we'll notice that

      the version in p1 is an ancestor of the version in p2. This test makes

      sure that we'll use the version from p2 in the manifest of the merge

      revision.

        $ hg init

        $ echo foo > foo

        $ hg ci -qAm 'add foo'

        $ echo bar >> foo

        $ hg ci -m 'change foo'

        $ hg backout -r tip -m 'backout changed foo'

        reverting foo

        changeset 2:4d9e78aaceee backs out changeset 1:b515023e500e

        $ hg up -C 0

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        $ touch bar

        $ hg ci -qAm 'add bar'

        $ hg merge --debug

          searching for copies back to rev 1

          unmatched files in local:

           bar

        resolving manifests

         overwrite: False, partial: False

         ancestor: bbd179dfa0a7, local: 71766447bdbb+, remote: 4d9e78aaceee

         foo: remote is newer -> g

        updating: foo 1/1 files (100.00%)

        getting foo

        1 files updated, 0 files merged, 0 files removed, 0 files unresolved

        (branch merge, don't forget to commit)

        $ hg debugstate | grep foo

        n   0         -2 unset               foo

        $ hg st -A foo

        M foo

        $ hg ci -m 'merge'

        $ hg manifest --debug | grep foo

        c6fc755d7e68f49f880599da29f15add41f42f5a 644   foo

        $ hg debugindex foo

           rev    offset  length  ..... linkrev nodeid       p1           p2 (re)

             0         0       5  .....       0 2ed2a3912a0b 000000000000 000000000000 (re)

             1         5       9  .....       1 6f4310b00b9a 2ed2a3912a0b 000000000000 (re)

             2        14       5  .....       2 c6fc755d7e68 6f4310b00b9a 000000000000 (re)

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				http://mercurial.selenic.com/bts/issue522

				In the merge below, the file "foo" has the same contents in both
				parents, but if we look at the file-level history, we'll notice that
				the version in p1 is an ancestor of the version in p2. This test makes
				sure that we'll use the version from p2 in the manifest of the merge
				revision.

				$ hg init

				$ echo foo > foo
				$ hg ci -qAm 'add foo'

				$ echo bar >> foo
				$ hg ci -m 'change foo'

				$ hg backout -r tip -m 'backout changed foo'
				reverting foo
				changeset 2:4d9e78aaceee backs out changeset 1:b515023e500e

				$ hg up -C 0
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved

				$ touch bar
				$ hg ci -qAm 'add bar'

				$ hg merge --debug
				searching for copies back to rev 1
				unmatched files in local:
				bar
				resolving manifests
				overwrite: False, partial: False
				ancestor: bbd179dfa0a7, local: 71766447bdbb+, remote: 4d9e78aaceee
				foo: remote is newer -> g
				updating: foo 1/1 files (100.00%)
				getting foo
				1 files updated, 0 files merged, 0 files removed, 0 files unresolved
				(branch merge, don't forget to commit)

				$ hg debugstate \| grep foo
				n 0 -2 unset foo

				$ hg st -A foo
				M foo

				$ hg ci -m 'merge'

				$ hg manifest --debug \| grep foo
				c6fc755d7e68f49f880599da29f15add41f42f5a 644 foo

				$ hg debugindex foo
				rev offset length ..... linkrev nodeid p1 p2 (re)
				0 0 5 ..... 0 2ed2a3912a0b 000000000000 000000000000 (re)
				1 5 9 ..... 1 6f4310b00b9a 2ed2a3912a0b 000000000000 (re)
				2 14 5 ..... 2 c6fc755d7e68 6f4310b00b9a 000000000000 (re)