adding numa_nodebind=${node} option to mysqld_safe

Summary:
Automation will pass in the right value to this option if
it needs to bind mysqld to a particular socket. That will happen
via systemd scripts.

This is only adding the capability on the mysqld_safe side to be able to
pass in numactl to the server. The turning on of this feature will need more
testing and slow roll, and that will happen in different diffs on the ops repo.

Test Plan:
RPM Is properly built and systemd scripts can be manually
altered to start mysqld with proper cpunodebind.

   tested on devserver - passed in nodebind=1

   taskset -c -p 3793853
   pid 3793853's current affinity list: 14-27,42-55

Reviewers: tec, bagrawal, abhinavsharma, mama

Reviewed By: mama

Subscribers: webscalesql-eng@fb.com, #mysql_infra

Differential Revision: https://phabricator.intern.facebook.com/D6067155

Signature: 6067155:1508261855:338b45bc0672355574f1ffdfaa36ddd74cba38e7

scripts/mysqld_safe.sh

@@ -19,6 +19,7 @@ mysqld_ld_preload=
 mysqld_ld_library_path=
 flush_caches=0
 numa_interleave=0
+numa_nodebind=
 
 # Initial logging status: error log is not open, and not using syslog
 logging=init
@@ -87,6 +88,7 @@ Usage: $0 [OPTIONS]
   --flush-caches             Flush and purge buffers/caches
   --numa-interleave          Run mysqld with its memory interleaved
                              on all CPUs
+  --numa-nodebind            Run mysqld with numa binding to one socket
 
 All other options are passed to the mysqld program.
 
@@ -261,6 +263,7 @@ parse_arguments() {
       --timezone=*) TZ="$val"; export TZ; ;;
       --flush-caches) flush_caches=1 ;;
       --numa-interleave) numa_interleave=1 ;;
+      --numa-nodebind=*) numa_nodebind="$val" ;;
 
       --help) usage ;;
 
@@ -888,6 +891,30 @@ then
   exit 1
 fi
 
+if @TARGET_LINUX@ && test ! -z "$numa_nodebind"
+then
+  # Locate numactl, ensure it exists.
+  if ! my_which numactl > /dev/null 2>&1
+  then
+    log_error "numactl command not found, required for --numa-nodebind"
+    exit 1
+  fi
+
+  # Attempt to run a command, ensure it works.
+  if ! numactl --cpunodebind=$numa_nodebind --preferred=$numa_nodebind true
+  then
+    log_error "numactl failed, check if numa-nodebind value is correct"
+    exit 1
+  fi
+
+  # Launch mysqld with numactl.
+  cmd="$cmd numactl --cpunodebind=$numa_nodebind --preferred=$numa_nodebind"
+elif test ! -z "$numa_nodebind"
+then
+  log_error "--numa-nodebind is not supported on this platform"
+  exit 1
+fi
+
 for i in  "$ledir/$MYSQLD" "$defaults" "--basedir=$MY_BASEDIR_VERSION" \
   "--datadir=$DATADIR" "--plugin-dir=$plugin_dir" "$USER_OPTION"
 do