From ab9221d8a494194886cdf2ebabeeb8c74d888f2e Mon Sep 17 00:00:00 2001
From: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Tue, 21 Oct 2014 22:47:42 -0300
Subject: [PATCH 08/15] CLI: Introduce --nohz_full/-N entity

This will set as the cpu list what was configured on the nohz_full=
kernel command line argument, allowing isolating these CPUs and then
moving to it some important app, i.e. all the other operations one
can do in tuna can apply to that cpu list.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: John Kacur <jkacur@redhat.com>
---
 tuna-cmd.py  | 11 +++++++++--
 tuna/tuna.py |  4 ++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/tuna-cmd.py b/tuna-cmd.py
index 5dcc18167d17..9edf7de6c286 100755
--- a/tuna-cmd.py
+++ b/tuna-cmd.py
@@ -58,6 +58,7 @@ def usage():
 	print fmt % ('-K, --no_kthreads',	    _('Operations will not affect kernel threads'))
 	print fmt % ('-m, --move',		    _('Move selected entities to %(cpulist)s') % \
 							{"cpulist": _('CPU-LIST')})
+	print fmt % ('-N, --nohz_full',		    _('CPUs in nohz_full= kernel command line will be affected by operations'))
 	if have_inet_diag:
 		print fmt % ('-n, --show_sockets',  _('Show network sockets in use by threads'))
 	print fmt % ('-p, --priority=[' +
@@ -449,9 +450,9 @@ def main():
 
 	i18n_init()
 	try:
-		short = "a:c:CfgGhiIKlmp:PQq:s:S:t:UvWx"
+		short = "a:c:CfgGhiIKlmNp:PQq:s:S:t:UvWx"
 		long = ["cpus=", "affect_children", "filter", "gui", "help",
-			"isolate", "include", "no_kthreads", "move",
+			"isolate", "include", "no_kthreads", "move", "nohz_full",
 			"show_sockets", "priority=", "show_threads",
 			"show_irqs", "irqs=",
 			"save=", "sockets=", "threads=", "no_uthreads",
@@ -490,6 +491,12 @@ def main():
 			(op, a) = pick_op(a)
 			op_list = tuna.cpustring_to_list(a)
 			cpu_list = do_list_op(op, cpu_list, op_list)
+		elif o in ("-N", "--nohz_full"):
+			try:
+				cpu_list = tuna.nohz_full_list()
+			except:
+				print "tuna: --nohz_full " + _(" needs nohz_full=cpulist on the kernel command line")
+				sys.exit(2)
 		elif o in ("-C", "--affect_children"):
 			affect_children = True
 		elif o in ("-G", "--cgroup"):
diff --git a/tuna/tuna.py b/tuna/tuna.py
index 49c9eabdf499..7b839f1e2d96 100755
--- a/tuna/tuna.py
+++ b/tuna/tuna.py
@@ -622,3 +622,7 @@ def generate_rtgroups(filename, kthreads, nr_cpus):
 						   schedutils.schedstr(kt.policy)[6].lower(),
 						   kt.rtprio, mask, regex))
 	f.close()
+
+
+def nohz_full_list():
+	return [ int(cpu) for cpu in procfs.cmdline().options["nohz_full"].split(",") ]
-- 
1.8.3.1