[Intel-gfx] [PATCH] drm/i915: avoid big kmallocs on reading error state

[Chris Wilson]

On Wed, May 22, 2013 at 04:42:53PM +0300, Mika Kuoppala wrote:
> Sometimes when user is trying to get error state out from
> debugfs after gpu hang, the memory is low and/or fragmented
> enough that kmalloc in seq_file will fail.
> 
> Prevent big kmalloc by avoiding seq_file and instead convert
> error state to string in smaller chunks.
> 
> v2: better alloc flags, better truncate, correct
> locking, and error handling improvements (Chris Wilson)
> 
> Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>

I am reasonably happy with this. Every attempt to see how we might
shoe-horn iterating over the error state with seq_file has so far been
overly complicated, and the only benefit it may bring is the focus on
iterating at a higher level than characters.

Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre