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vmstat: Add cpu isolation awareness

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Ensure vmstat updates do not run on isolated cpus.

Change-Id: Ie16cc9eb73b240459a9a385c39f3176b57d34950
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[rameezmustafa@codeaurora.org: Port to msm-4.9]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org>
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Olav Haugan
2016-05-29 19:37:20 -07:00
committed by Satya Durga Srinivasu Prabhala
parent c934db5672
commit 5d135373a7
1 changed files with 3 additions and 2 deletions
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5
mm/vmstat.c
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@@ -1793,7 +1793,7 @@ int vmstat_refresh(struct ctl_table *table, int write,
static void vmstat_update(struct work_struct *w) static void vmstat_update(struct work_struct *w)
{ {
if (refresh_cpu_vm_stats(true)) { if (refresh_cpu_vm_stats(true) && !cpu_isolated(smp_processor_id())) {
/* /*
* Counters were updated so we expect more updates * Counters were updated so we expect more updates
* to occur in the future. Keep on running the * to occur in the future. Keep on running the
@@ -1884,7 +1884,8 @@ static void vmstat_shepherd(struct work_struct *w)
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
struct delayed_work *dw = &per_cpu(vmstat_work, cpu); struct delayed_work *dw = &per_cpu(vmstat_work, cpu);
if (!delayed_work_pending(dw) && need_update(cpu)) if (!delayed_work_pending(dw) && need_update(cpu) &&
!cpu_isolated(cpu))
queue_delayed_work_on(cpu, mm_percpu_wq, dw, 0); queue_delayed_work_on(cpu, mm_percpu_wq, dw, 0);
} }
put_online_cpus(); put_online_cpus();