Commit ad2a05a6 authored by David Wang's avatar David Wang Committed by Huacai Chen
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LoongArch/irq: Use seq_put_decimal_ull_width() for decimal values 



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).

Signed-off-by: default avatarDavid Wang <00107082@163.com>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 55dc2f8f

arch/loongarch/kernel/smp.c

+1 −1
Original line number Diff line number Diff line
@@ -82,7 +82,7 @@ void show_ipi_list(struct seq_file *p, int prec) 
	for (i = 0; i < NR_IPI; i++) {

		seq_printf(p, "%*s%u:%s", prec - 1, "IPI", i, prec >= 4 ? " " : "");

		for_each_online_cpu(cpu)

			seq_printf(p, "%10u ", per_cpu(irq_stat, cpu).ipi_irqs[i]);

			seq_put_decimal_ull_width(p, " ", per_cpu(irq_stat, cpu).ipi_irqs[i], 10);

		seq_printf(p, " LoongArch  %d  %s\n", i + 1, ipi_types[i]);

	}

}