diff options
| -rw-r--r-- | Documentation/mm/slub.rst | 2 | ||||
| -rw-r--r-- | mm/slub.c | 16 |
2 files changed, 17 insertions, 1 deletions
diff --git a/Documentation/mm/slub.rst b/Documentation/mm/slub.rst index 4e1578186b4f..7f652216dabe 100644 --- a/Documentation/mm/slub.rst +++ b/Documentation/mm/slub.rst @@ -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. diff --git a/mm/slub.c b/mm/slub.c index f162683f3006..3fc7d861d1f2 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -5586,7 +5586,21 @@ 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) |