find_nsegment_idx: double size of the lookup cache in an attempt

to mitigate the probable increase in miss rates resulting from
r11798 (which causes increased numbers of such queries).

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@11799

diff --git a/coregrind/m_aspacemgr/aspacemgr-linux.c b/coregrind/m_aspacemgr/aspacemgr-linux.c
index 9765ba8dd79ea2d3b123226ae1eb6d45bb007bfd..4d1094abee03ab80e6e0cfe8106f01ab5c14c357 100644 (file)
--- a/coregrind/m_aspacemgr/aspacemgr-linux.c
+++ b/coregrind/m_aspacemgr/aspacemgr-linux.c
@@ -1146,7 +1146,7 @@ static Int find_nsegment_idx_WRK ( Addr a )
 
 inline static Int find_nsegment_idx ( Addr a )
 {
-#  define N_CACHE 63
+#  define N_CACHE 131 /*prime*/
    static Addr cache_pageno[N_CACHE];
    static Int  cache_segidx[N_CACHE];
    static Bool cache_inited = False;