linux-kernel - Re: [PATCH v2] mm: optimize stat output for 11% sys time reduce

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Message-ID: <7210e5e0-2a93-4d3b-a564-85c0fe117ef5@gmail.com>
Date: Sun, 11 Jan 2026 12:37:45 +0800
From: Jianyue Wu <wujianyue000@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, cgroups@...r.kernel.org, hannes@...xchg.org,
 mhocko@...nel.org, roman.gushchin@...ux.dev, shakeel.butt@...ux.dev,
 muchun.song@...ux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mm: optimize stat output for 11% sys time reduce

On 1/11/2026 7:33 AM, Andrew Morton wrote:
> On Sat, 10 Jan 2026 12:22:49 +0800 Jianyue Wu <wujianyue000@...il.com> wrote:
>
>> Replace seq_printf/seq_buf_printf with lightweight helpers to avoid
>> printf parsing in memcg stats output.
>>
> I don't understand - your previous email led me to believe that the new
> BPF interface can be used to address this issue?

Yes, previously I think can directly use BPF interface to speedup. Later 
I think maybe this is still needed, as some platform didn't have BPF 
installed might still use these sysfs files.