[Intel-gfx] [PATCH 03/21] drm/i915/gemfs: enable THP

[Joonas Lahtinen]

On Fri, 2017-09-29 at 17:10 +0100, Matthew Auld wrote:
> Enable transparent-huge-pages through gemfs by mounting with
> huge=within_size.
> 
> v2: sprinkle within_size comment
> 
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/i915_gemfs.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gemfs.c b/drivers/gpu/drm/i915/i915_gemfs.c
> index 168d0bd98f60..b1b4d13d8f97 100644
> --- a/drivers/gpu/drm/i915/i915_gemfs.c
> +++ b/drivers/gpu/drm/i915/i915_gemfs.c
> @@ -24,6 +24,7 @@
>  
>  #include <linux/fs.h>
>  #include <linux/mount.h>
> +#include <linux/pagemap.h>
>  
>  #include "i915_drv.h"
>  #include "i915_gemfs.h"
> @@ -41,6 +42,26 @@ int i915_gemfs_init(struct drm_i915_private *i915)
>  	if (IS_ERR(gemfs))
>  		return PTR_ERR(gemfs);
>  
> +	/*
> +	 * Enable huge-pages for objects that are at least HPAGE_PMD_SIZE, most
> +	 * likely 2M. Note that within_size may overallocate huge-pages, if say
> +	 * we allocate an object of size 2M + 4K, but under memory pressure

Maybe append after "2M + 4K" "we may get 2M + 2M", to complete the
sentence.

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation