linux-kernel - Re: [PATCH v2 2/7] memcg: dynamically allocate lruvec

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Date: Mon, 29 Apr 2024 14:02:23 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Shakeel Butt <shakeel.butt@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Muchun Song <muchun.song@...ux.dev>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] memcg: dynamically allocate lruvec_stats

On Mon, Apr 29, 2024 at 12:46:32PM -0700, Shakeel Butt wrote:
> On Mon, Apr 29, 2024 at 08:50:11AM -0700, Roman Gushchin wrote:
> > On Fri, Apr 26, 2024 at 05:37:28PM -0700, Shakeel Butt wrote:
> [...]
> 
> > > +	return x;
> > > +}
> > > +
> > >  /* Subset of vm_event_item to report for memcg event stats */
> > >  static const unsigned int memcg_vm_event_stat[] = {
> > >  	PGPGIN,
> > > @@ -5492,18 +5546,25 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
> > >  	if (!pn)
> > >  		return 1;
> > >  
> > > +	pn->lruvec_stats = kzalloc_node(sizeof(struct lruvec_stats), GFP_KERNEL,
> > > +					node);
> > 
> > Why not GFP_KERNEL_ACCOUNT?
> > 
> 
> Previously struct lruvec_stats was part of struct mem_cgroup_per_node
> and we use GFP_KERNEL to allocate struct mem_cgroup_per_node. I kept the
> behavior same and if we want to switch to GFP_KERNEL_ACCOUNT, I think it
> should be a separate patch.

Agree. Here is the patch:

--

>From fd6854c0b272c5314bce6c9dee7d3c8f8cee3a86 Mon Sep 17 00:00:00 2001
From: Roman Gushchin <roman.gushchin@...ux.dev>
Date: Mon, 29 Apr 2024 13:57:26 -0700
Subject: [PATCH] mm: memcg: account memory used for memcg vmstats and lruvec
 stats

The percpu memory used by memcg's memory statistics is already accounted.
For consistency, let's enable accounting for vmstats and lruvec stats
as well.

Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
 mm/memcontrol.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d11536ef59ef..2fe25d49cfaa 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5661,8 +5661,8 @@ static int alloc_mem_cgroup_per_node_info(struct mem_cgroup *memcg, int node)
 	if (!pn)
 		return 1;
 
-	pn->lruvec_stats = kzalloc_node(sizeof(struct lruvec_stats), GFP_KERNEL,
-					node);
+	pn->lruvec_stats = kzalloc_node(sizeof(struct lruvec_stats),
+					GFP_KERNEL_ACCOUNT, node);
 	if (!pn->lruvec_stats)
 		goto fail;
 
@@ -5733,7 +5733,8 @@ static struct mem_cgroup *mem_cgroup_alloc(struct mem_cgroup *parent)
 		goto fail;
 	}
 
-	memcg->vmstats = kzalloc(sizeof(struct memcg_vmstats), GFP_KERNEL);
+	memcg->vmstats = kzalloc(sizeof(struct memcg_vmstats),
+				 GFP_KERNEL_ACCOUNT);
 	if (!memcg->vmstats)
 		goto fail;
 
-- 
2.43.2