Re: [PATCH] kernel/irq/proc: performance: replace seq_printf with seq_put_decimal_ull_width

patchwork-bot+linux-riscv
2024-12-11T23:45:31Z

Hello:

This patch was applied to riscv/linux.git (fixes)
by Michael Ellerman <mpe@ellerman.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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