linux-kernel - Re: [PATCH] xfs: remove SLAB_MEM

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Message-ID: <ed50835c-80be-491f-a5f9-9a669a84cac5@linux.dev>
Date: Sun, 25 Feb 2024 12:50:18 +0800
From: Chengming Zhou <chengming.zhou@...ux.dev>
To: "Darrick J. Wong" <djwong@...nel.org>
Cc: chandan.babu@...cle.com, linux-xfs@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org, vbabka@...e.cz,
 roman.gushchin@...ux.dev, Xiongwei.Song@...driver.com,
 Chengming Zhou <zhouchengming@...edance.com>
Subject: Re: [PATCH] xfs: remove SLAB_MEM_SPREAD flag usage

On 2024/2/25 01:03, Darrick J. Wong wrote:
> On Sat, Feb 24, 2024 at 01:53:23PM +0000, chengming.zhou@...ux.dev wrote:
>> From: Chengming Zhou <zhouchengming@...edance.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@...edance.com>
> 
> Acked-by: Darrick J. Wong <djwong@...nel.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
>>
>>