linux-kernel - Re: vmstat: On demand vmstat workers V8

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Date:	Fri, 11 Jul 2014 10:17:41 -0500 (CDT)
From:	Christoph Lameter <cl@...two.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	akpm@...ux-foundation.org, Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, John Stultz <johnstul@...ibm.com>,
	Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
	viresh.kumar@...aro.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org
Subject: Re: vmstat: On demand vmstat workers V8

On Fri, 11 Jul 2014, Frederic Weisbecker wrote:

> > Converted what? We still need to keep a cpumask around that tells us which
> > processor have vmstat running and which do not.
> >
>
> Converted to cpumask_var_t.
>
> I mean we spent dozens emails on that...


Oh there is this outstanding fix, right.


Subject: on demand vmstat: Do not open code alloc_cpumask_var

Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/mm/vmstat.c
===================================================================
--- linux.orig/mm/vmstat.c	2014-07-11 10:15:55.356856916 -0500
+++ linux/mm/vmstat.c	2014-07-11 10:15:55.352856994 -0500
@@ -1244,7 +1244,7 @@
 #ifdef CONFIG_SMP
 static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
 int sysctl_stat_interval __read_mostly = HZ;
-struct cpumask *cpu_stat_off;
+cpumask_var_t cpu_stat_off;

 static void vmstat_update(struct work_struct *w)
 {
@@ -1338,7 +1338,8 @@
 		INIT_DEFERRABLE_WORK(per_cpu_ptr(&vmstat_work, cpu),
 			vmstat_update);

-	cpu_stat_off = kmalloc(cpumask_size(), GFP_KERNEL);
+	if (!alloc_cpumask_var(&cpu_stat_off, GFP_KERNEL))
+		BUG();
 	cpumask_copy(cpu_stat_off, cpu_online_mask);

 	schedule_delayed_work(&shepherd,
--
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