Messages in this thread Patch in this message | | | From | Santosh Shilimkar <> | Subject | [PATCH v2] oprofile: Fix the hang while offline the cpu | Date | Wed, 27 Oct 2010 20:47:15 +0530 |
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The kernel build with CONFIG_OPROFILE and CPU_HOTPLUG enabled. The oprofile is initialised using system timer in absence of hardware counters supports. Oprofile isn't started from userland.
In this setup while doing a CPU offline the kernel hangs in infinite for loop inside lock_hrtimer_base() function
This happens because as part of oprofile_cpu_notify(, it tries to stop an hrtimer which was never started. These per-cpu hrtimers are started when the oprfile is started. echo 1 > /dev/oprofile/enable
This problem also existwhen the cpu is booted with maxcpus parameter set. When bringing the remaining cpus online the timers are started even if oprofile is not yet enabled.
This patch fix this issue by adding a state variable so that these hrtimer start/stop is only attempted when oprofile is started
Reported-by: Jan Sebastien <s-jan@ti.com> Signed-off-by: sricharan <r.sricharan@ti.com> Tested-by: sricharan <r.sricharan@ti.com> Cc: Robert Richter <robert.richter@amd.com> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> --- V2: Updated patch with comments from Robert Richter drivers/oprofile/timer_int.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/drivers/oprofile/timer_int.c b/drivers/oprofile/timer_int.c index dc0ae4d..0107251 100644 --- a/drivers/oprofile/timer_int.c +++ b/drivers/oprofile/timer_int.c @@ -21,6 +21,7 @@ #include "oprof.h" static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer); +static int ctr_running; static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer) { @@ -33,6 +34,9 @@ static void __oprofile_hrtimer_start(void *unused) { struct hrtimer *hrtimer = &__get_cpu_var(oprofile_hrtimer); + if (!ctr_running) + return; + hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hrtimer->function = oprofile_hrtimer_notify; @@ -42,7 +46,10 @@ static void __oprofile_hrtimer_start(void *unused) static int oprofile_hrtimer_start(void) { + get_online_cpus(); + ctr_running = 1; on_each_cpu(__oprofile_hrtimer_start, NULL, 1); + put_online_cpus(); return 0; } @@ -50,6 +57,9 @@ static void __oprofile_hrtimer_stop(int cpu) { struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu); + if (!ctr_running) + return; + hrtimer_cancel(hrtimer); } @@ -57,8 +67,11 @@ static void oprofile_hrtimer_stop(void) { int cpu; + get_online_cpus(); for_each_online_cpu(cpu) __oprofile_hrtimer_stop(cpu); + ctr_running = 0; + put_online_cpus(); } static int __cpuinit oprofile_cpu_notify(struct notifier_block *self, -- 1.6.0.4
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