From 22293e5806f58a9682267139678a5cc117fd3dcf Mon Sep 17 00:00:00 2001 From: Venki Pallipadi Date: Sat, 21 Jul 2007 17:10:44 +0200 Subject: [PATCH] x86: round_jiffies() for i386 and x86-64 non-critical/corrected MCE polling This helps to reduce the frequency at which the CPU must be taken out of a lower-power state. Signed-off-by: Venkatesh Pallipadi Acked-by: Tim Hockin Signed-off-by: Andrew Morton Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/i386/kernel/cpu/mcheck/non-fatal.c | 4 ++-- arch/x86_64/kernel/mce.c | 9 ++++++--- 2 files changed, 8 insertions(+), 5 deletions(-) diff --git a/arch/i386/kernel/cpu/mcheck/non-fatal.c b/arch/i386/kernel/cpu/mcheck/non-fatal.c index 6b5d3518a1c..bf39409b383 100644 --- a/arch/i386/kernel/cpu/mcheck/non-fatal.c +++ b/arch/i386/kernel/cpu/mcheck/non-fatal.c @@ -57,7 +57,7 @@ static DECLARE_DELAYED_WORK(mce_work, mce_work_fn); static void mce_work_fn(struct work_struct *work) { on_each_cpu(mce_checkregs, NULL, 1, 1); - schedule_delayed_work(&mce_work, MCE_RATE); + schedule_delayed_work(&mce_work, round_jiffies_relative(MCE_RATE)); } static int __init init_nonfatal_mce_checker(void) @@ -82,7 +82,7 @@ static int __init init_nonfatal_mce_checker(void) /* * Check for non-fatal errors every MCE_RATE s */ - schedule_delayed_work(&mce_work, MCE_RATE); + schedule_delayed_work(&mce_work, round_jiffies_relative(MCE_RATE)); printk(KERN_INFO "Machine check exception polling timer started.\n"); return 0; } diff --git a/arch/x86_64/kernel/mce.c b/arch/x86_64/kernel/mce.c index 7c8ab423abe..4d8450ee363 100644 --- a/arch/x86_64/kernel/mce.c +++ b/arch/x86_64/kernel/mce.c @@ -375,7 +375,8 @@ static void mcheck_timer(struct work_struct *work) if (mce_notify_user()) { next_interval = max(next_interval/2, HZ/100); } else { - next_interval = min(next_interval*2, check_interval*HZ); + next_interval = min(next_interval*2, + (int)round_jiffies_relative(check_interval*HZ)); } schedule_delayed_work(&mcheck_work, next_interval); @@ -428,7 +429,8 @@ static __init int periodic_mcheck_init(void) { next_interval = check_interval * HZ; if (next_interval) - schedule_delayed_work(&mcheck_work, next_interval); + schedule_delayed_work(&mcheck_work, + round_jiffies_relative(next_interval)); idle_notifier_register(&mce_idle_notifier); return 0; } @@ -720,7 +722,8 @@ static void mce_restart(void) on_each_cpu(mce_init, NULL, 1, 1); next_interval = check_interval * HZ; if (next_interval) - schedule_delayed_work(&mcheck_work, next_interval); + schedule_delayed_work(&mcheck_work, + round_jiffies_relative(next_interval)); } static struct sysdev_class mce_sysclass = { -- 2.41.1