[lttng-dev] [PATCH lttng-modules] Fix: writeback instrumentation for 4.2 kernels

[Mathieu Desnoyers]

I picked up your patch into master and stable-2.7, but
did the following modif on top:

commit c7d89a6dc97f72013851ae94478a4c92e77e1f56
Author: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
Date:   Fri Aug 21 09:28:44 2015 -0700

    Cleanup: split bdi_dirty_ratelimit with ifdef into separate macros
    
    Makes the code easier to maintain in the long run.
    
    Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>

Thanks!

Mathieu

----- On Aug 20, 2015, at 7:23 PM, Michael Jeanson mjeanson at efficios.com wrote:

> Bandwidth related fields were moved by this commit:
> 
> commit a88a341a73be4ef035ca26170c849f002797da27
> Author: Tejun Heo <tj at kernel.org>
> Date:   Fri, 22 May 2015 17:13:28 -0400
> 
>    writeback: move bandwidth related fields from backing_dev_info into
>    bdi_writeback
> 
> Signed-off-by: Michael Jeanson <mjeanson at efficios.com>
> ---
> instrumentation/events/lttng-module/writeback.h | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
> 
> diff --git a/instrumentation/events/lttng-module/writeback.h
> b/instrumentation/events/lttng-module/writeback.h
> index 88b7aa4..b55d15e 100644
> --- a/instrumentation/events/lttng-module/writeback.h
> +++ b/instrumentation/events/lttng-module/writeback.h
> @@ -363,13 +363,27 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
> 
> 	TP_FIELDS(
> 		ctf_array_text(char, bdi, dev_name(bdi->dev), 32)
> +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0))
> +		ctf_integer(unsigned long, write_bw, KBps(bdi->wb.write_bandwidth))
> +		ctf_integer(unsigned long, avg_write_bw, KBps(bdi->wb.avg_write_bandwidth))
> +#else
> 		ctf_integer(unsigned long, write_bw, KBps(bdi->write_bandwidth))
> 		ctf_integer(unsigned long, avg_write_bw, KBps(bdi->avg_write_bandwidth))
> +#endif
> 		ctf_integer(unsigned long, dirty_rate, KBps(dirty_rate))
> +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0))
> +		ctf_integer(unsigned long, dirty_ratelimit, KBps(bdi->wb.dirty_ratelimit))
> +#else
> 		ctf_integer(unsigned long, dirty_ratelimit, KBps(bdi->dirty_ratelimit))
> +#endif
> 		ctf_integer(unsigned long, task_ratelimit, KBps(task_ratelimit))
> +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0))
> +		ctf_integer(unsigned long, balanced_dirty_ratelimit,
> +					KBps(bdi->wb.balanced_dirty_ratelimit))
> +#else
> 		ctf_integer(unsigned long, balanced_dirty_ratelimit,
> 					KBps(bdi->balanced_dirty_ratelimit))
> +#endif
> 	)
> )
> 
> --
> 1.9.1

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com