On 5/21/2021 4:43 PM, Vlastimil Babka wrote:
> On 5/18/21 2:45 PM, Faiyaz Mohammed wrote:
>> alloc_calls and free_calls implementation in sysfs have two issues,
>> one is PAGE_SIZE limitiation of sysfs and other is it does not adhere
>> to "one value per file" rule.
>>
>> To overcome this issues, move the alloc_calls and free_calls implemeation
>> to debugfs.
>>
>> Rename the alloc_calls/free_calls to alloc_traces/free_traces,
>> to be inline with what it does.
>>
>> Reported-by: kernel test robot <lkp@xxxxxxxxx>
>> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>> Signed-off-by: Faiyaz Mohammed <faiyazm@xxxxxxxxxxxxxx>
>
>
>> @@ -5817,6 +5769,249 @@ static int __init slab_sysfs_init(void)
>> __initcall(slab_sysfs_init);
>> #endif /* CONFIG_SYSFS */
>>
>> +#if defined(CONFIG_SLUB_DEBUG) && defined(CONFIG_DEBUG_FS)
>> +static int debugfs_slab_alias(struct kmem_cache *s, const char *name)
>> +{
>> + struct saved_alias *al;
>> + struct dentry *slab_cache_dir;
>> +
>> + if (slab_state == FULL) {
>> + /*
>> + * If we have a leftover link then remove it.
>> + */
>> + slab_cache_dir = debugfs_lookup(s->name, slab_debugfs_root);
>> + debugfs_remove(slab_cache_dir);
>> + debugfs_create_symlink(name, slab_debugfs_root, NULL);
>
> v6 got stuck on boot for me, unlike v5, seems like here you should return 0?
> That helped
>
oh, it worked me without return, but I think yes, have to return from
here once the symlink is created like sysfs_slab_alias do. I will update
in next patch version.
>> + }
>> +
>> + al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL);
>> + if (!al)
>> + return -ENOMEM;
>> +
>> + al->s = s;
>> + al->name = name;
>> + al->next = alias_list;
>> + alias_list = al;
>> + return 0;
>> +}
>> +
Thanks and regards,
Mohammed Faiyaz
