Abhinav's work on case-mincore-hugepages

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/case-mincore-hugepages b/case-mincore-hugepages
new file mode 100644
index 0000000..40ffbfa
--- /dev/null
+++ b/case-mincore-hugepages
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+#!/bin/bash
+
+#
+# Exercises code in mincore.c mm/
+#
+
+source ./hw_vars
+
+# set number of hugepages in the system
+echo never > /sys/kernel/mm/transparent_hugepage/enabled
+echo $((mem/Hugepagesize/1024 / 20)) > /proc/sys/vm/nr_hugepages
+echo $((mem/Hugepagesize/1024 / 10)) > /proc/sys/vm/nr_overcommit_hugepages
+
+#check for max shared memory allowed on system
+MAX_HUGEPAGES=$(($(</proc/sys/vm/nr_hugepages)+$(</proc/sys/vm/nr_overcommit_hugepages)))
+
+#segment size being requested
+SHM_SIZE=$(($MAX_HUGEPAGES*$hugepagesize / nr_cpu))
+
+#set shmmax to accommodate the request
+echo $SHM_SIZE > /proc/sys/kernel/shmmax
+
+#check to see if the request can be satisfied else exit with error
+MAX_SHARE_SEGMENT=$(</proc/sys/kernel/shmmax)
+if [ $SHM_SIZE -gt $MAX_SHARE_SEGMENT ]
+then
+        echo "Cannot allocate more shared memory segment than $MAX_SHARE_SEGMENT"
+        echo "exiting now..."
+        exit 1 #exit on failure
+fi
+
+create_sparse_file $SPARSE_FILE $SHM_SIZE
+
+$USEMEM -t $nr_cpu -f $SPARSE_FILE -H --prealloc --readonly --random $SHM_SIZE
+
+echo always > /sys/kernel/mm/transparent_hugepage/enabled
+
+rm $SPARSE_FILE