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: David Wang <00107082@163.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

diff --git a/arch/loongarch/kernel/smp.c b/arch/loongarch/kernel/smp.c
index 5d59e9ce2772d8a7f885ce35e715bff77c0fa021..fbf747447f13fd356edb056cc3f5dea502e813b7 100644 (file)
--- a/arch/loongarch/kernel/smp.c
+++ b/arch/loongarch/kernel/smp.c
@@ -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]);
        }
 }