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sh: irq: Use seq_put_decimal_ull_width() for decimal values

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On a system with n CPUs and m interrupts, there will be n*m decimal
values yielded via seq_printf(.."%10u "..) which has significant costs
parsing format string and is less efficient than seq_put_decimal_ull_width().
Stress reading /proc/interrupts indicates ~30% performance improvement with
this patch.

Signed-off-by: David Wang <00107082@163.com>
Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
This commit is contained in:
David Wang 2024-11-30 21:49:09 +08:00 • committed by John Paul Adrian Glaubitz
parent 40384c840e
commit d2a5f10bf1
1 changed files with 2 additions and 2 deletions
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4
arch/sh/kernel/irq.c
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@ -43,9 +43,9 @@ int arch_show_interrupts(struct seq_file *p, int prec)
{
int j;
seq_printf(p, "%*s: ", prec, "NMI");
seq_printf(p, "%*s:", prec, "NMI");
for_each_online_cpu(j)
seq_printf(p, "%10u ", per_cpu(irq_stat.__nmi_count, j));
seq_put_decimal_ull_width(p, " ", per_cpu(irq_stat.__nmi_count, j), 10);
seq_printf(p, " Non-maskable interrupts\n");
seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));