Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c3508f8f341f19f6b1c3f854f144540427668151 Commit: c3508f8f341f19f6b1c3f854f144540427668151 Parent: 2618f86e0010fc6703e77af3613bac7ade46efc6 Author: Ravikiran G Thirumalai <[EMAIL PROTECTED]> AuthorDate: Sat Jul 21 17:10:19 2007 +0200 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Sat Jul 21 18:37:09 2007 -0700
x86_64: Avoid too many remote cpu references due to /proc/stat Too many remote cpu references due to /proc/stat. On x86_64, with newer kernel versions, kstat_irqs is a bit of a problem. On every call to kstat_irqs, the process brings in per-cpu data from all online cpus. Doing this for NR_IRQS, which is now 256 + 32 * NR_CPUS results in (256+32*63) * 63 remote cpu references on a 64 cpu config. /proc/stat is parsed by common commands like top, who etc, causing lots of cacheline transfers This statistic seems useless. Other 'big iron' arches disable this. AK: changed to remove for all SMP setups AK: add comment Signed-off-by: Ravikiran Thirumalai <[EMAIL PROTECTED]> Signed-off-by: Andi Kleen <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- fs/proc/proc_misc.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c index f133afe..bee251c 100644 --- a/fs/proc/proc_misc.c +++ b/fs/proc/proc_misc.c @@ -507,7 +507,8 @@ static int show_stat(struct seq_file *p, void *v) } seq_printf(p, "intr %llu", (unsigned long long)sum); -#if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA) && !defined(CONFIG_IA64) +#ifndef CONFIG_SMP + /* Touches too many cache lines on SMP setups */ for (i = 0; i < NR_IRQS; i++) seq_printf(p, " %u", per_irq_sum[i]); #endif - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html