linux-kernel - Re: [PATCH] kernel/irq/proc: performance: replace seq_printf with seq_put_decimal_ull

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Message-Id: 
 <173395636600.1729195.17930169527159894833.git-patchwork-notify@kernel.org>
Date: Wed, 11 Dec 2024 22:32:46 +0000
From: patchwork-bot+linux-riscv@...nel.org
To: David Wang <00107082@....com>
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Subject: Re: [PATCH] kernel/irq/proc: performance: replace seq_printf with
 seq_put_decimal_ull_width

Hello:

This patch was applied to riscv/linux.git (fixes)
by Michael Ellerman <mpe@...erman.id.au>:

On Sun,  3 Nov 2024 16:05:52 +0800 you wrote:
> seq_printf is costy, when stress reading /proc/interrupts, profiling indicates
> seq_printf takes about ~47% of show_interrupts samples:
> 
>     show_interrupts(94.495% 5166019/5466991)
> 	seq_printf(47.429% 2450210/5166019)
> 	    vsnprintf(89.232% 2186366/2450210)
> 		format_decode(24.005% 524831/2186366)
> 		number(19.488% 426084/2186366)
> 		memcpy_orig(3.739% 81753/2186366)
> 		...
> 	_raw_spin_unlock_irqrestore(26.643% 1376379/5166019)
> 	mtree_load(8.059% 416304/5166019)
> 
> [...]

Here is the summary with links:
  - kernel/irq/proc: performance: replace seq_printf with seq_put_decimal_ull_width
    https://git.kernel.org/riscv/c/5b881c1f8379

You are awesome, thank you!
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