[PATCH 1 of 2] obsolete: speed up computation of bumped revset

[Laurent Charignon]

# HG changeset patch
# User Laurent Charignon <lcharignon at fb.com>
# Date 1429911990 25200
#      Fri Apr 24 14:46:30 2015 -0700
# Node ID 1fc6e61a669102a73d4ced63989704e4faf72993
# Parent  e9edd53770fb77a9787a3e6592a3bf0a29c1bd80
obsolete: speed up computation of bumped revset

Speed up the computation of the bumped revset by using the not public() revset.
In another patch series, we optimized the not public() revset. Together,
this cuts the cost of the computation of bumped() from 17% of the total time of
smartlog on our big repo to under 0.1% of the total time.

diff --git a/mercurial/obsolete.py b/mercurial/obsolete.py
--- a/mercurial/obsolete.py
+++ b/mercurial/obsolete.py
@@ -1139,19 +1139,18 @@
     public = phases.public
     cl = repo.changelog
     torev = cl.nodemap.get
-    obs = getrevs(repo, 'obsolete')
-    for rev in repo:
+    for ctx in repo.set('(not public()) and (not obsolete())'):
+        rev = ctx.rev()
         # We only evaluate mutable, non-obsolete revision
-        if (public < phase(repo, rev)) and (rev not in obs):
-            node = cl.node(rev)
-            # (future) A cache of precursors may worth if split is very common
-            for pnode in allprecursors(repo.obsstore, [node],
-                                       ignoreflags=bumpedfix):
-                prev = torev(pnode) # unfiltered! but so is phasecache
-                if (prev is not None) and (phase(repo, prev) <= public):
-                    # we have a public precursors
-                    bumped.add(rev)
-                    break # Next draft!
+        node = ctx.node()
+        # (future) A cache of precursors may worth if split is very common
+        for pnode in allprecursors(repo.obsstore, [node],
+                                   ignoreflags=bumpedfix):
+            prev = torev(pnode) # unfiltered! but so is phasecache
+            if (prev is not None) and (phase(repo, prev) <= public):
+                # we have a public precursors
+                bumped.add(rev)
+                break # Next draft!
     return bumped
 
 @cachefor('divergent')