Add default stack checking

[zfs.git] / scripts / common.sh.in

diff --git a/scripts/common.sh.in b/scripts/common.sh.in
index cf55859..51671eb 100644 (file)
--- a/scripts/common.sh.in
+++ b/scripts/common.sh.in
@@ -635,3 +635,29 @@ wait_udev() {
 
        return 0
 }
+
+stack_clear() {
+       local STACK_MAX_SIZE=/sys/kernel/debug/tracing/stack_max_size
+       local STACK_TRACER_ENABLED=/proc/sys/kernel/stack_tracer_enabled
+
+       if [ -e $STACK_MAX_SIZE ]; then
+               echo 1 >$STACK_TRACER_ENABLED
+               echo 0 >$STACK_MAX_SIZE
+       fi
+}
+
+stack_check() {
+       local STACK_MAX_SIZE=/sys/kernel/debug/tracing/stack_max_size
+       local STACK_TRACE=/sys/kernel/debug/tracing/stack_trace
+       local STACK_LIMIT=7000
+
+       if [ -e $STACK_MAX_SIZE ]; then
+               STACK_SIZE=`cat $STACK_MAX_SIZE`
+
+               if [ $STACK_SIZE -ge $STACK_LIMIT ]; then
+                       echo
+                       echo "Warning: max stack size $STACK_SIZE bytes"
+                       cat $STACK_TRACE
+               fi
+       fi
+}