Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r63:20644865dbf8
Date: 2013-06-04 10:37 +0200
http://bitbucket.org/pypy/stmgc/changeset/20644865dbf8/
Log: Mention a trade-off to explore
diff --git a/c3/doc-objects.txt b/c3/doc-objects.txt
--- a/c3/doc-objects.txt
+++ b/c3/doc-objects.txt
@@ -126,6 +126,12 @@
add P to 'read_barrier_cache' and return
+It is unclear if it's better to stick all private objects into the
+read_barrier_cache, or to extend the read barrier's inline code to also
+check if h_revision == PRN (trade-off of polluting the cache with
+private objects which might be a majority, vs. making the inline check
+larger).
+
Handles are stored for example in a global list, and the actual handle
encodes an index in the list. Every entry in the list is a pointer to a
prot/priv object --- excepted once every N positions, where it is a
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