linux-kernel - Re: [PATCH 3/3] mm: memcontrol: report kernel stack usage in cgroup2 memory.stat

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Date:	Fri, 5 Feb 2016 13:01:57 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...nel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] mm: memcontrol: report kernel stack usage in cgroup2
 memory.stat

On Thu, Feb 04, 2016 at 03:52:10PM -0500, Johannes Weiner wrote:
> On Thu, Feb 04, 2016 at 04:03:39PM +0300, Vladimir Davydov wrote:
> > Show how much memory is allocated to kernel stacks.
> > 
> > Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
> 
> Acked-by: Johannes Weiner <hannes@...xchg.org>

Thanks.

> 
> Thanks, this looks good. The only thing that strikes me is that you
> appended the new stat items to the enum, but then prepended them to
> the doc and stat file sections. Why is that?

No reason. Let's rearrange the enum fields to be consistent with the
stat file output.

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index aaf564881303..d6300313b298 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -52,10 +52,10 @@ enum mem_cgroup_stat_index {
 	MEM_CGROUP_STAT_SWAP,		/* # of pages, swapped out */
 	MEM_CGROUP_STAT_NSTATS,
 	/* default hierarchy stats */
-	MEMCG_SOCK = MEM_CGROUP_STAT_NSTATS,
+	MEMCG_KERNEL_STACK = MEM_CGROUP_STAT_NSTATS,
 	MEMCG_SLAB_RECLAIMABLE,
 	MEMCG_SLAB_UNRECLAIMABLE,
-	MEMCG_KERNEL_STACK,
+	MEMCG_SOCK,
 	MEMCG_NR_STAT,
 };