diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c b/drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c index 58bb256ee047..77b1ef64ecc0 100644 --- a/drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c +++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-cpu.c @@ -952,6 +952,7 @@ static int cfs_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { unsigned int cpu = (unsigned long)hcpu; + bool warn; switch (action) { case CPU_DEAD: @@ -962,9 +963,21 @@ cfs_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) cpt_data.cpt_version++; spin_unlock(&cpt_data.cpt_lock); default: - CWARN("Lustre: can't support CPU hotplug well now, " - "performance and stability could be impacted" - "[CPU %u notify: %lx]\n", cpu, action); + if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) { + CDEBUG(D_INFO, "CPU changed [cpu %u action %lx]\n", + cpu, action); + break; + } + + down(&cpt_data.cpt_mutex); + /* if all HTs in a core are offline, it may break affinity */ + cfs_cpu_ht_siblings(cpu, cpt_data.cpt_cpumask); + warn = any_online_cpu(*cpt_data.cpt_cpumask) >= nr_cpu_ids; + up(&cpt_data.cpt_mutex); + CDEBUG(warn ? D_WARNING : D_INFO, + "Lustre: can't support CPU plug-out well now, " + "performance and stability could be impacted " + "[CPU %u action: %lx]\n", cpu, action); } return NOTIFY_OK; |