[Xen-changelog] Add additional stats to track VHPT saturation

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User djm@xxxxxxxxxxxxxxx
# Node ID aecdccb1a35026aee872c5a0a7235bd6d74244ca
# Parent  b52a4864477057a43ab9bc4c82538650f8256880
Add additional stats to track VHPT saturation

diff -r b52a48644770 -r aecdccb1a350 xen/arch/ia64/xen/privop.c
--- a/xen/arch/ia64/xen/privop.c        Fri Sep 16 22:53:30 2005
+++ b/xen/arch/ia64/xen/privop.c        Fri Sep 16 22:54:53 2005
@@ -1107,6 +1107,7 @@
 #ifdef PRIVOP_ADDR_COUNT
        n += dump_privop_addrs(buf + n);
 #endif
+       n += dump_vhpt_stats(buf + n);
        n += dump_misc_stats(buf + n);
        if (len < TMPBUFLEN) return -1;
        if (__copy_to_user(ubuf,buf,n)) return -1;
@@ -1122,6 +1123,7 @@
 #ifdef PRIVOP_ADDR_COUNT
        zero_privop_addrs();
 #endif
+       zero_vhpt_stats();
        zero_misc_stats();
        zero_reflect_counts();
        if (len < TMPBUFLEN) return -1;
diff -r b52a48644770 -r aecdccb1a350 xen/arch/ia64/xen/vhpt.c
--- a/xen/arch/ia64/xen/vhpt.c  Fri Sep 16 22:53:30 2005
+++ b/xen/arch/ia64/xen/vhpt.c  Fri Sep 16 22:54:53 2005
@@ -149,3 +149,24 @@
        vhpt_flush();
 }
 
+
+void zero_vhpt_stats(void)
+{
+       return;
+}
+
+int dump_vhpt_stats(char *buf)
+{
+       int i;
+       char *s = buf;
+       struct vhpt_lf_entry *v = (void *)VHPT_ADDR;
+       unsigned long vhpt_valid = 0, vhpt_chains = 0;
+
+       for (i = 0; i < VHPT_NUM_ENTRIES; i++, v++) {
+               if (!(v->ti_tag & INVALID_TI_TAG)) vhpt_valid++;
+               if (v->CChain) vhpt_chains++;
+       }
+       s += sprintf(s,"VHPT usage: %ld/%ld (%ld collision chains)\n",
+               vhpt_valid,VHPT_NUM_ENTRIES,vhpt_chains);
+       return s - buf;
+}

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