It takes quite a long time to calculate the value of a TLB miss
cost. Once calculated, this patch caches the value in one of
two places. If it has the necessary permission, it's recorded in
/etc/tlbmisscost.conf/etc/tlbmisscost.conf. It is also recorded in
$HOME/.tlbmisscostrc. Cached values are reused later unless -f or
--ignore-cache is specified.
Signed-off-by: Mel Gorman <m...@csn.ul.ie>
---
contrib/tlbmiss_cost.sh | 39 ++++++++++++++++++++++++++++++++++++++-
1 files changed, 38 insertions(+), 1 deletions(-)
diff --git a/contrib/tlbmiss_cost.sh b/contrib/tlbmiss_cost.sh
index 3c750af..1f1e234 100755
--- a/contrib/tlbmiss_cost.sh
+++ b/contrib/tlbmiss_cost.sh
@@ -624,7 +624,7 @@ oprofile_calc()
LAST_LATENCY_CYCLES=$(($WALK/$DTLB))
}
-ARGS=`getopt -o c:s:vqh --long
calibrator:,stream:,vmlinux:,verbose,quiet,fetch-calibrator,fetch-stream,help
-n 'tlbmiss_cost.sh' -- "$@"`
+ARGS=`getopt -o c:s:fvqh --long
calibrator:,stream:,vmlinux:,verbose,quiet,fetch-calibrator,fetch-stream,ignore-cache,help
-n 'tlbmiss_cost.sh' -- "$@"`
eval set -- "$ARGS"
@@ -635,6 +635,7 @@ while true ; do
--vmlinux) VMLINUX="--vmlinux $2" ; shift 2 ;;
-v|--verbose) VERBOSE=$(($VERBOSE+1)); shift;;
-q|--quiet) VERBOSE=$(($VERBOSE-1)); shift;;
+ -f|--ignore-cache) IGNORE_CACHE=yes; shift;;
--fetch-calibrator) calibrator_fetch; shift;;
--fetch-stream) stream_fetch; shift;;
-h|--help) usage; shift;;
@@ -644,8 +645,35 @@ while true ; do
esac
done
+HOSTNAME=`hostname 2> /dev/null`
ARCH=`uname -m | sed -e s/i.86/i386/`
+if [ "$IGNORE_CACHE" != "yes" ]; then
+ print_trace Searching for a cached value for TLB miss
+
+ # Look for a cached entry for the TLB miss value
+ if [ -e /etc/tlbmisscost.conf ]; then
+ print_trace Checking /etc/tlbmisscost.conf
+ grep TLB_MISS_COST /etc/tlbmisscost.conf
+ if [ $? -eq 0 ]; then
+ exit 0
+ fi
+ fi
+
+ # Look for a cached entry in home
+ if [ -e $HOME/.tlbmisscostrc ]; then
+ print_trace Checking $HOME/.tlbmisscostrc
+ HOSTNAME=`hostname 2> /dev/null`
+ if [ "$HOSTNAME" != "" -a "$HOSTNAME" != "localhost" ]; then
+ grep $HOSTNAME:TLB_MISS_COST $HOME/.tlbmisscostrc | sed
-e "s/^$HOSTNAME://"
+ if [ $? -eq 0 ]; then
+ exit 0
+ fi
+ fi
+ fi
+ print_trace Cached value unavailable
+fi
+
if [[ "$ARCH" == "ppc64" || "$ARCH" == "ppc" ]]; then
oprofile_calc
else
@@ -653,4 +681,13 @@ else
fi
echo TLB_MISS_COST=$LAST_LATENCY_CYCLES
+
+# Save for future reference
+echo TLB_MISS_COST=$LAST_LATENCY_CYCLES 2> /dev/null > /etc/tlbmisscost.conf
+if [ "$HOSTNAME" != "" -a "$HOSTNAME" != "localhost" ]; then
+ grep -v $HOSTNAME:TLB_MISS_COST $HOME/.tlbmisscostrc >
$HOME/.tlbmisscostrc.$$ 2> /dev/null
+ echo $HOSTNAME:TLB_MISS_COST=$LAST_LATENCY_CYCLES >>
$HOME/.tlbmisscostrc.$$
+ mv $HOME/.tlbmisscostrc.$$ $HOME/.tlbmisscostrc
+fi
+
exit 0
--
1.7.1
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