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Merge branch 'slab/for-6.2/slub-sysfs' into slab/for-next

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- Two patches for SLUB's sysfs by Rasmus Villemoes to remove dead code
  and optimize boot time with late initialization.
- Allow SLUB's sysfs 'failslab' parameter to be runtime-controllable
  again as it can be both useful and safe, by Alexander Atanasov.
This commit is contained in:
Vlastimil Babka 2022-11-10 09:53:26 +01:00
commit c64b95d3dd
2 changed files with 18 additions and 8 deletions
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2
Documentation/mm/slub.rst
View File

@ -116,6 +116,8 @@ options from the ``slub_debug`` parameter translate to the following files::
T trace
A failslab
failslab file is writable, so writing 1 or 0 will enable or disable
the option at runtime. Write returns -EINVAL if cache is an alias.
Careful with tracing: It may spew out lots of information and never stop if
used on the wrong slab.

24
mm/slub.c
View File

@ -5575,7 +5575,21 @@ static ssize_t failslab_show(struct kmem_cache *s, char *buf)
{
return sysfs_emit(buf, "%d\n", !!(s->flags & SLAB_FAILSLAB));
}
SLAB_ATTR_RO(failslab);
static ssize_t failslab_store(struct kmem_cache *s, const char *buf,
size_t length)
{
if (s->refcount > 1)
return -EINVAL;
if (buf[0] == '1')
WRITE_ONCE(s->flags, s->flags | SLAB_FAILSLAB);
else
WRITE_ONCE(s->flags, s->flags & ~SLAB_FAILSLAB);
return length;
}
SLAB_ATTR(failslab);
#endif
static ssize_t shrink_show(struct kmem_cache *s, char *buf)
@ -5909,11 +5923,6 @@ static int sysfs_slab_add(struct kmem_cache *s)
struct kset *kset = cache_kset(s);
int unmergeable = slab_unmergeable(s);
if (!kset) {
kobject_init(&s->kobj, &slab_ktype);
return 0;
}
if (!unmergeable && disable_higher_order_debug &&
(slub_debug & DEBUG_METADATA_FLAGS))
unmergeable = 1;
@ -6043,8 +6052,7 @@ static int __init slab_sysfs_init(void)
mutex_unlock(&slab_mutex);
return 0;
}
__initcall(slab_sysfs_init);
late_initcall(slab_sysfs_init);
#endif /* CONFIG_SYSFS */
#if defined(CONFIG_SLUB_DEBUG) && defined(CONFIG_DEBUG_FS)