[PATCH 6 of 9 V3] manifest: change manifestlog mancache to be directory based

[Durham Goode]

Woops, this patch didn't change manifestlog.get() to actually use the 
directory cache in the treemanifest code path.  Will resend with that fixed.


On 9/20/16 12:36 PM, Durham Goode wrote:
> # HG changeset patch
> # User Durham Goode <durham at fb.com>
> # Date 1474400113 25200
> #      Tue Sep 20 12:35:13 2016 -0700
> # Node ID 22915866409350cbb5302289c05bb65bc1bfd308
> # Parent  52a206d772021194ab4356aeba2c73650851a624
> manifest: change manifestlog mancache to be directory based
>
> In the last patch we added a get() function that allows fetching directory level
> treemanifestctxs. It didn't handle caching at directory level though, so we need to
> change our mancache to support multiple directories.
>
> diff --git a/mercurial/manifest.py b/mercurial/manifest.py
> --- a/mercurial/manifest.py
> +++ b/mercurial/manifest.py
> @@ -1021,9 +1021,16 @@ class manifestlog(object):
>               usetreemanifest = opts.get('treemanifest', usetreemanifest)
>           self._treeinmem = usetreemanifest
>   
> +        # A dictionary containing the cache for each directory
> +        self._dirmancache = {}
> +
>           # We'll separate this into it's own cache once oldmanifest is no longer
>           # used
> -        self._mancache = repo.manifest._mancache
> +        self._dirmancache[''] = repo.manifest._mancache
> +
> +        # A future patch makes this use the same config value as the existing
> +        # mancache
> +        self.cachesize = 4
>   
>       @property
>       def _revlog(self):
> @@ -1047,8 +1054,8 @@ class manifestlog(object):
>                           _("cannot ask for manifest directory '%s' in a flat "
>                             "manifest") % dir)
>           else:
> -            if node in self._mancache:
> -                cachemf = self._mancache[node]
> +            if node in self._dirmancache.get(dir, ()):
> +                cachemf = self._dirmancache[dir][node]
>                   # The old manifest may put non-ctx manifests in the cache, so
>                   # skip those since they don't implement the full api.
>                   if (isinstance(cachemf, manifestctx) or
> @@ -1059,8 +1066,13 @@ class manifestlog(object):
>                   m = treemanifestctx(self._revlog, '', node)
>               else:
>                   m = manifestctx(self._revlog, node)
> -            if node != revlog.nullid:
> -                self._mancache[node] = m
> +
> +        if node != revlog.nullid:
> +            mancache = self._dirmancache.get(dir)
> +            if not mancache:
> +                mancache = util.lrucachedict(self.cachesize)
> +                self._dirmancache[dir] = mancache
> +            mancache[node] = m
>           return m
>   
>       def add(self, m, transaction, link, p1, p2, added, removed):
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