From: Iago Toral <itoral@igalia.com>
To: "Maíra Canal" <mcanal@igalia.com>,
"Melissa Wen" <mwen@igalia.com>,
"Tvrtko Ursulin" <tursulin@igalia.com>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"David Airlie" <airlied@gmail.com>,
"Daniel Vetter" <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org, kernel-dev@igalia.com,
Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Subject: Re: [PATCH v4 7/8] drm/v3d: Use gemfs/THP in BO creation if available
Date: Mon, 29 Apr 2024 07:22:33 +0200 [thread overview]
Message-ID: <0a966cc891b388133013b37820b7e0e7d982654c.camel@igalia.com> (raw)
In-Reply-To: <20240428124426.309096-8-mcanal@igalia.com>
Hi Maíra,
a question below:
El dom, 28-04-2024 a las 09:40 -0300, Maíra Canal escribió:
> Although Big/Super Pages could appear naturally, it would be quite
> hard
> to have 1MB or 64KB allocated contiguously naturally. Therefore, we
> can
> force the creation of large pages allocated contiguously by using a
> mountpoint with "huge=within_size" enabled.
>
> Therefore, as V3D has a mountpoint with "huge=within_size" (if user
> has
> THP enabled), use this mountpoint for BO creation if available. This
> will allow us to create large pages allocated contiguously and make
> use
> of Big/Super Pages.
>
> Signed-off-by: Maíra Canal <mcanal@igalia.com>
> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
> ---
>
(...)
> @@ -130,10 +140,17 @@ struct v3d_bo *v3d_bo_create(struct drm_device
> *dev, struct drm_file *file_priv,
> size_t unaligned_size)
> {
> struct drm_gem_shmem_object *shmem_obj;
> + struct v3d_dev *v3d = to_v3d_dev(dev);
> struct v3d_bo *bo;
> int ret;
>
> - shmem_obj = drm_gem_shmem_create(dev, unaligned_size);
> + /* Let the user opt out of allocating the BOs with THP */
> + if (v3d->gemfs)
> + shmem_obj = drm_gem_shmem_create_with_mnt(dev,
> unaligned_size,
> + v3d-
> >gemfs);
> + else
> + shmem_obj = drm_gem_shmem_create(dev,
> unaligned_size);
> +
> if (IS_ERR(shmem_obj))
> return ERR_CAST(shmem_obj);
> bo = to_v3d_bo(&shmem_obj->base);
if I read this correctly when we have THP we always allocate with that,
Even objects that are smaller than 64KB. I was wondering if there is
any benefit/downside to this or if the behavior for small allocations
is the same we had without the new mount point.
Iago
next prev parent reply other threads:[~2024-04-29 5:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-28 12:40 [PATCH v4 0/8] drm/v3d: Enable Big and Super Pages Maíra Canal
2024-04-28 12:40 ` [PATCH v4 1/8] drm/v3d: Fix return if scheduler initialization fails Maíra Canal
2024-04-28 12:40 ` [PATCH v4 2/8] drm/gem: Create a drm_gem_object_init_with_mnt() function Maíra Canal
2024-04-28 12:40 ` [PATCH v4 3/8] drm/v3d: Introduce gemfs Maíra Canal
2024-04-28 12:40 ` [PATCH v4 4/8] drm/gem: Create shmem GEM object in a given mountpoint Maíra Canal
2024-04-28 12:40 ` [PATCH v4 5/8] drm/v3d: Reduce the alignment of the node allocation Maíra Canal
2024-04-28 12:40 ` [PATCH v4 6/8] drm/v3d: Support Big/Super Pages when writing out PTEs Maíra Canal
2024-04-28 12:40 ` [PATCH v4 7/8] drm/v3d: Use gemfs/THP in BO creation if available Maíra Canal
2024-04-29 5:22 ` Iago Toral [this message]
2024-04-29 16:52 ` Maíra Canal
2024-04-28 12:40 ` [PATCH v4 8/8] drm/v3d: Add modparam for turning off Big/Super Pages Maíra Canal
2024-04-29 8:24 ` Tvrtko Ursulin
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