diff options
| -rw-r--r-- | Documentation/00-INDEX | 4 | ||||
| -rw-r--r-- | fs/proc/stat.c | 14 |
2 files changed, 12 insertions, 6 deletions
diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX index f54273e2ac9..ceb1ff73546 100644 --- a/Documentation/00-INDEX +++ b/Documentation/00-INDEX @@ -210,6 +210,8 @@ local_ops.txt - semantics and behavior of local atomic operations. lockdep-design.txt - documentation on the runtime locking correctness validator. +lockup-watchdogs.txt + - info on soft and hard lockup detectors (aka nmi_watchdog). logo.gif - full colour GIF image of Linux logo (penguin - Tux). logo.txt @@ -240,8 +242,6 @@ netlabel/ - directory with information on the NetLabel subsystem. networking/ - directory with info on various aspects of networking with Linux. -nmi_watchdog.txt - - info on NMI watchdog for SMP systems. nommu-mmap.txt - documentation about no-mmu memory mapping support. numastat.txt diff --git a/fs/proc/stat.c b/fs/proc/stat.c index 64c3b317236..e296572c73e 100644 --- a/fs/proc/stat.c +++ b/fs/proc/stat.c @@ -45,10 +45,13 @@ static cputime64_t get_iowait_time(int cpu) static u64 get_idle_time(int cpu) { - u64 idle, idle_time = get_cpu_idle_time_us(cpu, NULL); + u64 idle, idle_time = -1ULL; + + if (cpu_online(cpu)) + idle_time = get_cpu_idle_time_us(cpu, NULL); if (idle_time == -1ULL) - /* !NO_HZ so we can rely on cpustat.idle */ + /* !NO_HZ or cpu offline so we can rely on cpustat.idle */ idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; else idle = usecs_to_cputime64(idle_time); @@ -58,10 +61,13 @@ static u64 get_idle_time(int cpu) static u64 get_iowait_time(int cpu) { - u64 iowait, iowait_time = get_cpu_iowait_time_us(cpu, NULL); + u64 iowait, iowait_time = -1ULL; + + if (cpu_online(cpu)) + iowait_time = get_cpu_iowait_time_us(cpu, NULL); if (iowait_time == -1ULL) - /* !NO_HZ so we can rely on cpustat.iowait */ + /* !NO_HZ or cpu offline so we can rely on cpustat.iowait */ iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; else iowait = usecs_to_cputime64(iowait_time); |