[PATCH] net: remove SLAB_MEM_SPREAD flag usage

[PATCH] net: remove SLAB_MEM_SPREAD flag usage

[chengming.zhou]

From: Chengming Zhou <zhouchengming@bytedance.com>

The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
its usage so we can delete it from slab. No functional change.

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
---
 net/socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/socket.c b/net/socket.c
index ed3df2f749bf..7e9c8fc9a5b4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -343,7 +343,7 @@ static void init_inodecache(void)
 					      0,
 					      (SLAB_HWCACHE_ALIGN |
 					       SLAB_RECLAIM_ACCOUNT |
-					       SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+					       SLAB_ACCOUNT),
 					      init_once);
 	BUG_ON(sock_inode_cachep == NULL);
 }
-- 
2.40.1

Re: [PATCH] net: remove SLAB_MEM_SPREAD flag usage

[Chengming Zhou]

On 2024/2/24 21:49, chengming.zhou@linux.dev wrote:
> From: Chengming Zhou <zhouchengming@bytedance.com>
> 
> The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
> its usage so we can delete it from slab. No functional change.

Update changelog to make it clearer:

The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
removed as of v6.8-rc1, so it became a dead flag since the commit
16a1d968358a ("mm/slab: remove mm/slab.c and slab_def.h"). And the
series[1] went on to mark it obsolete explicitly to avoid confusion
for users. Here we can just remove all its users, which has no any
functional change.

[1] https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/

Thanks!

> 
> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
> ---
>  net/socket.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/socket.c b/net/socket.c
> index ed3df2f749bf..7e9c8fc9a5b4 100644
> --- a/net/socket.c
> +++ b/net/socket.c
> @@ -343,7 +343,7 @@ static void init_inodecache(void)
>  					      0,
>  					      (SLAB_HWCACHE_ALIGN |
>  					       SLAB_RECLAIM_ACCOUNT |
> -					       SLAB_MEM_SPREAD | SLAB_ACCOUNT),
> +					       SLAB_ACCOUNT),
>  					      init_once);
>  	BUG_ON(sock_inode_cachep == NULL);
>  }

Re: [PATCH] net: remove SLAB_MEM_SPREAD flag usage

[Simon Horman]

On Mon, Feb 26, 2024 at 04:55:01PM +0800, Chengming Zhou wrote:
> On 2024/2/24 21:49, chengming.zhou@linux.dev wrote:
> > From: Chengming Zhou <zhouchengming@bytedance.com>
> > 
> > The SLAB_MEM_SPREAD flag is already a no-op as of 6.8-rc1, remove
> > its usage so we can delete it from slab. No functional change.
> 
> Update changelog to make it clearer:
> 
> The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
> removed as of v6.8-rc1, so it became a dead flag since the commit
> 16a1d968358a ("mm/slab: remove mm/slab.c and slab_def.h"). And the
> series[1] went on to mark it obsolete explicitly to avoid confusion
> for users. Here we can just remove all its users, which has no any
> functional change.
> 
> [1] https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/
> 
> Thanks!
> 
> > 
> > Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>

Thanks Chengming Zhou,

this seems reasonable to me. But I think it would be best to post
a v2 of this patch with the updated patch description (which is very
helpful, BTW).

-- 
pw-bot: changes-requested

[PATCH v2] net: remove SLAB_MEM_SPREAD flag usage

[Chengming Zhou]

From: Chengming Zhou <zhouchengming@bytedance.com>

The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
removed as of v6.8-rc1, so it became a dead flag since the commit
16a1d968358a ("mm/slab: remove mm/slab.c and slab_def.h"). And the
series[1] went on to mark it obsolete to avoid confusion for users.
Here we can just remove all its users, which has no functional change.

[1] https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
---
v2:
 - Update the patch description and include the related link to
   make it clearer that SLAB_MEM_SPREAD flag is now a no-op.
---
 net/socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/socket.c b/net/socket.c
index ed3df2f749bf..7e9c8fc9a5b4 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -343,7 +343,7 @@ static void init_inodecache(void)
 					      0,
 					      (SLAB_HWCACHE_ALIGN |
 					       SLAB_RECLAIM_ACCOUNT |
-					       SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+					       SLAB_ACCOUNT),
 					      init_once);
 	BUG_ON(sock_inode_cachep == NULL);
 }
-- 
2.40.1

Re: [PATCH v2] net: remove SLAB_MEM_SPREAD flag usage

[Simon Horman]

On Wed, Feb 28, 2024 at 03:06:58AM +0000, Chengming Zhou wrote:
> From: Chengming Zhou <zhouchengming@bytedance.com>
> 
> The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
> removed as of v6.8-rc1, so it became a dead flag since the commit
> 16a1d968358a ("mm/slab: remove mm/slab.c and slab_def.h"). And the
> series[1] went on to mark it obsolete to avoid confusion for users.
> Here we can just remove all its users, which has no functional change.
> 
> [1] https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/
> 
> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
> ---
> v2:
>  - Update the patch description and include the related link to
>    make it clearer that SLAB_MEM_SPREAD flag is now a no-op.

Thanks for the update.

Reviewed-by: Simon Horman <horms@kernel.org>

Re: [PATCH v2] net: remove SLAB_MEM_SPREAD flag usage

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 28 Feb 2024 03:06:58 +0000 you wrote:
> From: Chengming Zhou <zhouchengming@bytedance.com>
> 
> The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
> removed as of v6.8-rc1, so it became a dead flag since the commit
> 16a1d968358a ("mm/slab: remove mm/slab.c and slab_def.h"). And the
> series[1] went on to mark it obsolete to avoid confusion for users.
> Here we can just remove all its users, which has no functional change.
> 
> [...]

Here is the summary with links:
  - [v2] net: remove SLAB_MEM_SPREAD flag usage
    https://git.kernel.org/netdev/net-next/c/d4f01c5e477a

You are awesome, thank you!
-- 
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