[PATCH] xfs: remove SLAB_MEM_SPREAD flag usage

[PATCH] xfs: 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>
---
 fs/xfs/xfs_super.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 56006b877a5d..171a1287b296 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -2042,8 +2042,7 @@ xfs_init_caches(void)
 
 	xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
 					 SLAB_HWCACHE_ALIGN |
-					 SLAB_RECLAIM_ACCOUNT |
-					 SLAB_MEM_SPREAD,
+					 SLAB_RECLAIM_ACCOUNT,
 					 NULL);
 	if (!xfs_buf_cache)
 		goto out;
@@ -2108,14 +2107,14 @@ xfs_init_caches(void)
 					   sizeof(struct xfs_inode), 0,
 					   (SLAB_HWCACHE_ALIGN |
 					    SLAB_RECLAIM_ACCOUNT |
-					    SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+					    SLAB_ACCOUNT),
 					   xfs_fs_inode_init_once);
 	if (!xfs_inode_cache)
 		goto out_destroy_efi_cache;
 
 	xfs_ili_cache = kmem_cache_create("xfs_ili",
 					 sizeof(struct xfs_inode_log_item), 0,
-					 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
+					 SLAB_RECLAIM_ACCOUNT,
 					 NULL);
 	if (!xfs_ili_cache)
 		goto out_destroy_inode_cache;
-- 
2.40.1

Re: [PATCH] xfs: remove SLAB_MEM_SPREAD flag usage

[Darrick J. Wong]

On Sat, Feb 24, 2024 at 01:53:23PM +0000, 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.
> 
> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>

Acked-by: Darrick J. Wong <djwong@kernel.org>

(acked, as in "this looks right, i don't know why it wasn't removed when
slab went away, and from the -mm list traffic this seems to be in line
with [1] but i still had to dig for details)

[1] https://lore.kernel.org/linux-mm/20240131172027.10f64405@gandalf.local.home/T/#u

--D

> ---
>  fs/xfs/xfs_super.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 56006b877a5d..171a1287b296 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -2042,8 +2042,7 @@ xfs_init_caches(void)
>  
>  	xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
>  					 SLAB_HWCACHE_ALIGN |
> -					 SLAB_RECLAIM_ACCOUNT |
> -					 SLAB_MEM_SPREAD,
> +					 SLAB_RECLAIM_ACCOUNT,
>  					 NULL);
>  	if (!xfs_buf_cache)
>  		goto out;
> @@ -2108,14 +2107,14 @@ xfs_init_caches(void)
>  					   sizeof(struct xfs_inode), 0,
>  					   (SLAB_HWCACHE_ALIGN |
>  					    SLAB_RECLAIM_ACCOUNT |
> -					    SLAB_MEM_SPREAD | SLAB_ACCOUNT),
> +					    SLAB_ACCOUNT),
>  					   xfs_fs_inode_init_once);
>  	if (!xfs_inode_cache)
>  		goto out_destroy_efi_cache;
>  
>  	xfs_ili_cache = kmem_cache_create("xfs_ili",
>  					 sizeof(struct xfs_inode_log_item), 0,
> -					 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
> +					 SLAB_RECLAIM_ACCOUNT,
>  					 NULL);
>  	if (!xfs_ili_cache)
>  		goto out_destroy_inode_cache;
> -- 
> 2.40.1
> 
> 

Re: [PATCH] xfs: remove SLAB_MEM_SPREAD flag usage

[Chengming Zhou]

On 2024/2/25 01:03, Darrick J. Wong wrote:
> On Sat, Feb 24, 2024 at 01:53:23PM +0000, 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.
>>
>> Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
> 
> Acked-by: Darrick J. Wong <djwong@kernel.org>
> 
> (acked, as in "this looks right, i don't know why it wasn't removed when
> slab went away, and from the -mm list traffic this seems to be in line
> with [1] but i still had to dig for details)

Right, I think it was just forgotten when slab went away. Then Steven reported
this when he found it obsolete. As discussed in [1], we submit these patches
independently to remove its usages.

[1] https://lore.kernel.org/all/20240220-slab-cleanup-flags-v1-0-e657e373944a@suse.cz/

Thanks!

> 
> [1] https://lore.kernel.org/linux-mm/20240131172027.10f64405@gandalf.local.home/T/#u
> 
> --D
> 
>> ---
>>  fs/xfs/xfs_super.c | 7 +++----
>>  1 file changed, 3 insertions(+), 4 deletions(-)
>>
>> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
>> index 56006b877a5d..171a1287b296 100644
>> --- a/fs/xfs/xfs_super.c
>> +++ b/fs/xfs/xfs_super.c
>> @@ -2042,8 +2042,7 @@ xfs_init_caches(void)
>>  
>>  	xfs_buf_cache = kmem_cache_create("xfs_buf", sizeof(struct xfs_buf), 0,
>>  					 SLAB_HWCACHE_ALIGN |
>> -					 SLAB_RECLAIM_ACCOUNT |
>> -					 SLAB_MEM_SPREAD,
>> +					 SLAB_RECLAIM_ACCOUNT,
>>  					 NULL);
>>  	if (!xfs_buf_cache)
>>  		goto out;
>> @@ -2108,14 +2107,14 @@ xfs_init_caches(void)
>>  					   sizeof(struct xfs_inode), 0,
>>  					   (SLAB_HWCACHE_ALIGN |
>>  					    SLAB_RECLAIM_ACCOUNT |
>> -					    SLAB_MEM_SPREAD | SLAB_ACCOUNT),
>> +					    SLAB_ACCOUNT),
>>  					   xfs_fs_inode_init_once);
>>  	if (!xfs_inode_cache)
>>  		goto out_destroy_efi_cache;
>>  
>>  	xfs_ili_cache = kmem_cache_create("xfs_ili",
>>  					 sizeof(struct xfs_inode_log_item), 0,
>> -					 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
>> +					 SLAB_RECLAIM_ACCOUNT,
>>  					 NULL);
>>  	if (!xfs_ili_cache)
>>  		goto out_destroy_inode_cache;
>> -- 
>> 2.40.1
>>
>>