From: Johannes Weiner <hannes@cmpxchg.org>
To: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Uladzislau Rezki <urezki@gmail.com>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Muchun Song <muchun.song@linux.dev>,
linux-mm@kvack.org, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org,
Meta kernel team <kernel-team@meta.com>
Subject: Re: [PATCH] memcg: vmalloc: simplify MEMCG_VMALLOC updates
Date: Thu, 3 Apr 2025 12:47:41 -0400 [thread overview]
Message-ID: <20250403164741.GB368504@cmpxchg.org> (raw)
In-Reply-To: <20250403053326.26860-1-shakeel.butt@linux.dev>
On Wed, Apr 02, 2025 at 10:33:26PM -0700, Shakeel Butt wrote:
> The vmalloc region can either be charged to a single memcg or none. At
> the moment kernel traverses all the pages backing the vmalloc region to
> update the MEMCG_VMALLOC stat. However there is no need to look at all
> the pages as all those pages will be charged to a single memcg or none.
> Simplify the MEMCG_VMALLOC update by just looking at the first page of
> the vmalloc region.
>
> Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev>
It's definitely pointless to handle each page with the stat being
per-cgroup only. But I do wonder why it's not a regular vmstat item.
There is no real reason it *should* be a private memcg stat, is there?
next prev parent reply other threads:[~2025-04-03 16:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-03 5:33 Shakeel Butt
2025-04-03 7:45 ` Michal Hocko
2025-04-03 11:17 ` Uladzislau Rezki
2025-04-03 18:20 ` Shakeel Butt
2025-04-04 10:34 ` Uladzislau Rezki
2025-04-04 17:44 ` Shakeel Butt
2025-04-07 9:59 ` Uladzislau Rezki
2025-04-03 16:47 ` Johannes Weiner [this message]
2025-04-03 18:23 ` Shakeel Butt
2025-04-22 15:17 ` Yosry Ahmed
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