Re: [PATCH] ceph: remove SLAB_MEM_SPREAD flag usage

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On 2/26/24 12:30, Chengming Zhou wrote:
On 2024/2/26 12:23, Xiubo Li wrote:
On 2/26/24 10:42, Chengming Zhou wrote:
On 2024/2/26 09:43, Xiubo Li wrote:
Hi Chengming,

Thanks for your patch.

BTW, could you share the link of the relevant patches to mark this a no-op ?
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. 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@xxxxxxx/
Thanks for your quick feedback.

BTW, I couldn't find this change in Linus' tree in the master and even the v6.8-rc1 tag, please see https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/include/linux/slab.h?h=master.

Did I miss something ? Or has this patch been merged ?
You're right, this patch hasn't been merged. But it's already a dead flag as of v6.8-rc1.

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 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@xxxxxxx/

Does this look clearer to you? I can improve it if there is still confusion.

Yeah, much clearer, thanks!

Maybe we should just wait for the [1] to get merged first ?

Ilya, what do you think ?

Thanks

- Xiubo


Thanks!

- Xiubo

Thanks!

Thanks

- Xiubo

On 2/24/24 21:47, chengming.zhou@xxxxxxxxx wrote:
From: Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
---
    fs/ceph/super.c | 18 +++++++++---------
    1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 5ec102f6b1ac..4dcbbaa297f6 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -928,36 +928,36 @@ static int __init init_caches(void)
        ceph_inode_cachep = kmem_cache_create("ceph_inode_info",
                          sizeof(struct ceph_inode_info),
                          __alignof__(struct ceph_inode_info),
-                      SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
-                      SLAB_ACCOUNT, ceph_inode_init_once);
+                      SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT,
+                      ceph_inode_init_once);
        if (!ceph_inode_cachep)
            return -ENOMEM;
    -    ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD);
+    ceph_cap_cachep = KMEM_CACHE(ceph_cap, 0);
        if (!ceph_cap_cachep)
            goto bad_cap;
-    ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, SLAB_MEM_SPREAD);
+    ceph_cap_snap_cachep = KMEM_CACHE(ceph_cap_snap, 0);
        if (!ceph_cap_snap_cachep)
            goto bad_cap_snap;
        ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush,
-                       SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
+                       SLAB_RECLAIM_ACCOUNT);
        if (!ceph_cap_flush_cachep)
            goto bad_cap_flush;
          ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info,
-                    SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD);
+                    SLAB_RECLAIM_ACCOUNT);
        if (!ceph_dentry_cachep)
            goto bad_dentry;
    -    ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
+    ceph_file_cachep = KMEM_CACHE(ceph_file_info, 0);
        if (!ceph_file_cachep)
            goto bad_file;
    -    ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD);
+    ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, 0);
        if (!ceph_dir_file_cachep)
            goto bad_dir_file;
    -    ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, SLAB_MEM_SPREAD);
+    ceph_mds_request_cachep = KMEM_CACHE(ceph_mds_request, 0);
        if (!ceph_mds_request_cachep)
            goto bad_mds_req;





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