Abhinav's work on case-shm-lock-unlock

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

1 files changed, 29 insertions, 0 deletions

diff --git a/case-shm-lock-unlock b/case-shm-lock-unlock
new file mode 100644
index 0000000..69c7f79
--- /dev/null
+++ b/case-shm-lock-unlock
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+#
+# Exercises the SYS V IPC code of mm/
+#
+# Creates a shared segment using shmget, attaches and locks it
+#
+# to calling process's VM and then unlocks and releases it.
+#
+
+source ./hw_vars
+
+#segment size being requested
+SHM_SIZE=$(((mem / nr_cpu) / 10))
+
+#check for max shared memory allowed on system
+MAX_SHARE_SEGMENT=$(</proc/sys/kernel/shmmax)
+
+echo "MAX SEGMENT is $MAX_SHARE_SEGMENT total asking is $((mem / 10))"
+
+#check to see if the request can be satisfied else exit with error
+if [ $MAX_SHARE_SEGMENT -lt $SHM_SIZE ]
+then
+	echo "Cannot allocate more shared memory segment than $MAX_SHARE_SEGMENT"
+	echo "exiting now..."
+	exit 1 #exit on failure
+fi
+
+$USEMEM -n $nr_cpu -L --random $SHM_SIZE