[PATCH 1/4] cgroup/dmem: Select PAGE_COUNTER

[PATCH 1/4] cgroup/dmem: Select PAGE_COUNTER

[Maxime Ripard]

The dmem cgroup the page counting API implemented behing the
PAGE_COUNTER kconfig option. However, it doesn't select it, resulting in
potential build breakages. Select PAGE_COUNTER.

Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501111330.3VuUx8vf-lkp@intel.com/
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 init/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/init/Kconfig b/init/Kconfig
index 61f50cafa815..5e5328506138 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1137,10 +1137,11 @@ config CGROUP_RDMA
 	  Attaching processes with active RDMA resources to the cgroup
 	  hierarchy is allowed even if can cross the hierarchy's limit.
 
 config CGROUP_DMEM
 	bool "Device memory controller (DMEM)"
+	select PAGE_COUNTER
 	help
 	  The DMEM controller allows compatible devices to restrict device
 	  memory usage based on the cgroup hierarchy.
 
 	  As an example, it allows you to restrict VRAM usage for applications
-- 
2.47.1

[PATCH 2/4] cgroup/dmem: Fix parameters documentation

[Maxime Ripard]

During the dmem cgroup development, the parameters to the
dmem_cgroup_state_evict_valuable() and dmem_cgroup_try_charge() were
changed, but the documentation wasn't adjusted accordingly.

This results in a documentation build warning. Adjust the documentation
to reflect what the final functions parameters are.

Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/r/20250113160334.1f09f881@canb.auug.org.au/
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 kernel/cgroup/dmem.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/kernel/cgroup/dmem.c b/kernel/cgroup/dmem.c
index 52736ef0ccf2..ecea58abed6a 100644
--- a/kernel/cgroup/dmem.c
+++ b/kernel/cgroup/dmem.c
@@ -278,12 +278,10 @@ dmem_cgroup_calculate_protection(struct dmem_cgroup_pool_state *limit_pool,
 	rcu_read_unlock();
 }
 
 /**
  * dmem_cgroup_state_evict_valuable() - Check if we should evict from test_pool
- * @dev: &dmem_cgroup_region
- * @index: The index number of the region being tested.
  * @limit_pool: The pool for which we hit limits
  * @test_pool: The pool for which to test
  * @ignore_low: Whether we have to respect low watermarks.
  * @ret_hit_low: Pointer to whether it makes sense to consider low watermark.
  *
@@ -609,17 +607,16 @@ void dmem_cgroup_uncharge(struct dmem_cgroup_pool_state *pool, u64 size)
 }
 EXPORT_SYMBOL_GPL(dmem_cgroup_uncharge);
 
 /**
  * dmem_cgroup_try_charge() - Try charging a new allocation to a region.
- * @dev: Device to charge
+ * @region: dmem region to charge
  * @size: Size (in bytes) to charge.
  * @ret_pool: On succesfull allocation, the pool that is charged.
  * @ret_limit_pool: On a failed allocation, the limiting pool.
  *
- * This function charges the current pool for @dev with region at @index for a
- * size of @size bytes.
+ * This function charges the @region region for a size of @size bytes.
  *
  * If the function succeeds, @ret_pool is set, which must be passed to
  * dmem_cgroup_uncharge() when undoing the allocation.
  *
  * When this function fails with -EAGAIN and @ret_limit_pool is non-null, it
-- 
2.47.1

[PATCH 3/4] drm/doc: Include new drm-compute documentation

[Maxime Ripard]

Commit b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting
cgroup") introduced a new documentation file, but didn't link it
anywhere. It was thus triggering a documentation build warning. Make
sure it's included as part of the DRM documentation.

Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/r/20250113155000.4a99e7b0@canb.auug.org.au/
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 Documentation/gpu/index.rst | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/gpu/index.rst b/Documentation/gpu/index.rst
index 37e383ccf73f..7dcb15850afd 100644
--- a/Documentation/gpu/index.rst
+++ b/Documentation/gpu/index.rst
@@ -11,10 +11,11 @@ GPU Driver Developer's Guide
    drm-kms-helpers
    drm-uapi
    drm-usage-stats
    driver-uapi
    drm-client
+   drm-compute
    drivers
    backlight
    vga-switcheroo
    vgaarbiter
    automated_testing
-- 
2.47.1

[PATCH 4/4] doc/cgroup: Fix title underline length

[Maxime Ripard]

Commit

Commit b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting
cgroup") introduced a new documentation file, with a shorter than
expected underline. This results in a documentation build warning. Fix
that underline length.

Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/r/20250113154611.624256bf@canb.auug.org.au/
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 Documentation/core-api/cgroup.rst | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/core-api/cgroup.rst b/Documentation/core-api/cgroup.rst
index 8696e9513f51..734ea21e1e17 100644
--- a/Documentation/core-api/cgroup.rst
+++ b/Documentation/core-api/cgroup.rst
@@ -1,9 +1,9 @@
 ==================
 Cgroup Kernel APIs
 ==================
 
 Device Memory Cgroup API (dmemcg)
-=========================
+=================================
 .. kernel-doc:: kernel/cgroup/dmem.c
    :export:
 
-- 
2.47.1

Re: [PATCH 4/4] doc/cgroup: Fix title underline length

[Simona Vetter]

On Mon, Jan 13, 2025 at 10:26:08AM +0100, Maxime Ripard wrote:
> Commit
> 
> Commit b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting
> cgroup") introduced a new documentation file, with a shorter than
> expected underline. This results in a documentation build warning. Fix
> that underline length.
> 
> Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
> Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
> Closes: https://lore.kernel.org/r/20250113154611.624256bf@canb.auug.org.au/
> Signed-off-by: Maxime Ripard <mripard@kernel.org>

On the three doc patches:

Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>

> ---
>  Documentation/core-api/cgroup.rst | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/Documentation/core-api/cgroup.rst b/Documentation/core-api/cgroup.rst
> index 8696e9513f51..734ea21e1e17 100644
> --- a/Documentation/core-api/cgroup.rst
> +++ b/Documentation/core-api/cgroup.rst
> @@ -1,9 +1,9 @@
>  ==================
>  Cgroup Kernel APIs
>  ==================
>  
>  Device Memory Cgroup API (dmemcg)
> -=========================
> +=================================
>  .. kernel-doc:: kernel/cgroup/dmem.c
>     :export:
>  
> -- 
> 2.47.1
> 

-- 
Simona Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH 1/4] cgroup/dmem: Select PAGE_COUNTER

[Simona Vetter]

On Mon, Jan 13, 2025 at 10:26:05AM +0100, Maxime Ripard wrote:
> The dmem cgroup the page counting API implemented behing the
> PAGE_COUNTER kconfig option. However, it doesn't select it, resulting in
> potential build breakages. Select PAGE_COUNTER.
> 
> Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202501111330.3VuUx8vf-lkp@intel.com/
> Signed-off-by: Maxime Ripard <mripard@kernel.org>

Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>

> ---
>  init/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/init/Kconfig b/init/Kconfig
> index 61f50cafa815..5e5328506138 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -1137,10 +1137,11 @@ config CGROUP_RDMA
>  	  Attaching processes with active RDMA resources to the cgroup
>  	  hierarchy is allowed even if can cross the hierarchy's limit.
>  
>  config CGROUP_DMEM
>  	bool "Device memory controller (DMEM)"
> +	select PAGE_COUNTER
>  	help
>  	  The DMEM controller allows compatible devices to restrict device
>  	  memory usage based on the cgroup hierarchy.
>  
>  	  As an example, it allows you to restrict VRAM usage for applications
> -- 
> 2.47.1
> 

-- 
Simona Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

Re: [PATCH 1/4] cgroup/dmem: Select PAGE_COUNTER

[Maxime Ripard]

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On Tue, Jan 14, 2025 at 03:53:23PM +0100, Simona Vetter wrote:
> On Mon, Jan 13, 2025 at 10:26:05AM +0100, Maxime Ripard wrote:
> > The dmem cgroup the page counting API implemented behing the
> > PAGE_COUNTER kconfig option. However, it doesn't select it, resulting in
> > potential build breakages. Select PAGE_COUNTER.
> > 
> > Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202501111330.3VuUx8vf-lkp@intel.com/
> > Signed-off-by: Maxime Ripard <mripard@kernel.org>
> 
> Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>

These patches have been pulled as a separate PR into drm-next, and I'm
not sure how we should merge these patches.

Obviously, we'd need Tejun's, Johannes', or Michal's ack, but should we
backmerged drm-next into drm-misc-next-fixes and apply them there?

Maxime

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Re: [PATCH 1/4] cgroup/dmem: Select PAGE_COUNTER

[Tejun Heo]

On Tue, Jan 14, 2025 at 04:02:55PM +0100, Maxime Ripard wrote:
> On Tue, Jan 14, 2025 at 03:53:23PM +0100, Simona Vetter wrote:
> > On Mon, Jan 13, 2025 at 10:26:05AM +0100, Maxime Ripard wrote:
> > > The dmem cgroup the page counting API implemented behing the
> > > PAGE_COUNTER kconfig option. However, it doesn't select it, resulting in
> > > potential build breakages. Select PAGE_COUNTER.
> > > 
> > > Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Closes: https://lore.kernel.org/oe-kbuild-all/202501111330.3VuUx8vf-lkp@intel.com/
> > > Signed-off-by: Maxime Ripard <mripard@kernel.org>
> > 
> > Reviewed-by: Simona Vetter <simona.vetter@ffwll.ch>
> 
> These patches have been pulled as a separate PR into drm-next, and I'm
> not sure how we should merge these patches.
> 
> Obviously, we'd need Tejun's, Johannes', or Michal's ack, but should we
> backmerged drm-next into drm-misc-next-fixes and apply them there?

Acked-by: Tejun Heo <tj@kernel.org>

Please route them with the existing dmem patches.

Thanks.

-- 
tejun

Re: [PATCH 1/4] cgroup/dmem: Select PAGE_COUNTER

[Maxime Ripard]

On Mon, 13 Jan 2025 10:26:05 +0100, Maxime Ripard wrote:
> The dmem cgroup the page counting API implemented behing the
> PAGE_COUNTER kconfig option. However, it doesn't select it, resulting in
> potential build breakages. Select PAGE_COUNTER.
> 
> 

Applied to misc/kernel.git (drm-misc-next-fixes).

Thanks!
Maxime