[PATCH, RFC] xfs: event tracing support

[Felix Blyakher]

On Jun 16, 2009, at 4:48 PM, Christoph Hellwig wrote:

> Convert the old xfs tracing support that could only be used with the  
> out
> of tree kdb and xfsidbg patches to use the generic event tracer.
>
> To use it make sure CONFIG_EVENT_TRACING is enabled and then enable  
> all
> xfs trace channels by:
>
>   echo 1 > /sys/kernel/debug/tracing/events/xfs/enable

Does event tracing work on ia64 platform?
I spent some time on it over weekend, but was not able even
to force "CONFIG_EVENT_TRACING=y" setting in the .config.
Seems to build ok on x86_64, which does have CONFIG_TRACING
in defconfig, and allows to set CONFIG_EVENT_TRACING.

If tracing is not available on all platforms, especially
on ia64, which is one of preferred platforms at SGI, we need
to preserve the original XFS tracing facilities. I know, it'll
be PIA to keep both tracing methods, but we can't drop
the working feature without good replacement.

Hope, though, that I missed something on ia64, and it's
fixable.

Felix