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
> + }
> +
> + 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;
> +}
> +
