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

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Message-ID: <uvmqfu2ms7itmfl2bk47yxtbafccscc2hlsw56uq2qy3q6fri3@sl56sf33fvyj>
Date: Mon, 12 Jan 2026 16:23:19 -0800
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Jianyue Wu <wujianyue000@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, 
	cgroups@...r.kernel.org, hannes@...xchg.org, mhocko@...nel.org, roman.gushchin@...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 Sun, Jan 11, 2026 at 12:37:45PM +0800, Jianyue Wu wrote:
> 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.
> 

It seems like this patch adds measurable improvement for the traditional
stat readers. The high performance ones can be switched to the bpf based
interface. So, I see no harm in taking this patch in.