add note about recent performance improvement

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5349

diff --git a/docs/internals/performance.txt b/docs/internals/performance.txt
index 6f7a178d569a066a40a5a549c22b66e423929e93..dcf1225071342ba446ee8e88a0bcade4e21801a3 100644 (file)
--- a/docs/internals/performance.txt
+++ b/docs/internals/performance.txt
@@ -14,6 +14,11 @@ Post 3.1.0:
 - Nick improved vg_SP_update_pass() to identify more small constant
   increments/decrements of SP, so the fast cases can be used more often.
   Saved 1--3% on a few programs.
+- r5345,r5346: Julian improved the dispatcher so that x86 and AMD64 use
+  jumps instead of call/return for calling translations, and also removed
+  the --profile-flags profiling from the dispatcher unless --profile-flags
+  is being used.  Improved Nulgrind performance typically by 10--20%,
+  and Memcheck performance typically by 2--20%.
 
 COMPVBITS branch:
 - Nick converted to compress V bits, initial version saved 0--5% on most