linux-kernel - Re: [PATCH AUTOSEL 6.12 18/36] LoongArch/irq: Use seq_put_decimal_ull

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Message-ID: <87zfl29gmt.ffs@tglx>
Date: Wed, 11 Dec 2024 20:14:18 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Cc: David Wang <00107082@....com>, Huacai Chen <chenhuacai@...ngson.cn>,
 Sasha Levin <sashal@...nel.org>, chenhuacai@...nel.org,
 maobibo@...ngson.cn, wangliupu@...ngson.cn, lvjianmin@...ngson.cn,
 zhangtianyang@...ngson.cn, loongarch@...ts.linux.dev
Subject: Re: [PATCH AUTOSEL 6.12 18/36] LoongArch/irq: Use
 seq_put_decimal_ull_width() for decimal values

On Wed, Dec 11 2024 at 13:49, Sasha Levin wrote:
> From: David Wang <00107082@....com>
>
> [ Upstream commit ad2a05a6d287aef7e069c06e329f1355756415c2 ]
>
> Performance improvement for reading /proc/interrupts on LoongArch.
>
> On a system with n CPUs and m interrupts, there will be n*m decimal
> values yielded via seq_printf(.."%10u "..) which is less efficient than
> seq_put_decimal_ull_width(), stress reading /proc/interrupts indicates
> ~30% performance improvement with this patch (and its friends).

Why is this stable material?

Thanks,

        tglx