diff options
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 22d2b2028e54..117ef1598469 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -100,6 +100,49 @@ static int hwpoison_filter_flags(struct page *p) return -EINVAL; } +/* + * This allows stress tests to limit test scope to a collection of tasks + * by putting them under some memcg. This prevents killing unrelated/important + * processes such as /sbin/init. Note that the target task may share clean + * pages with init (eg. libc text), which is harmless. If the target task + * share _dirty_ pages with another task B, the test scheme must make sure B + * is also included in the memcg. At last, due to race conditions this filter + * can only guarantee that the page either belongs to the memcg tasks, or is + * a freed page. + */ +#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP +u64 hwpoison_filter_memcg; +EXPORT_SYMBOL_GPL(hwpoison_filter_memcg); +static int hwpoison_filter_task(struct page *p) +{ + struct mem_cgroup *mem; + struct cgroup_subsys_state *css; + unsigned long ino; + + if (!hwpoison_filter_memcg) + return 0; + + mem = try_get_mem_cgroup_from_page(p); + if (!mem) + return -EINVAL; + + css = mem_cgroup_css(mem); + /* root_mem_cgroup has NULL dentries */ + if (!css->cgroup->dentry) + return -EINVAL; + + ino = css->cgroup->dentry->d_inode->i_ino; + css_put(css); + + if (ino != hwpoison_filter_memcg) + return -EINVAL; + + return 0; +} +#else +static int hwpoison_filter_task(struct page *p) { return 0; } +#endif + int hwpoison_filter(struct page *p) { if (hwpoison_filter_dev(p)) @@ -108,6 +151,9 @@ int hwpoison_filter(struct page *p) if (hwpoison_filter_flags(p)) return -EINVAL; + if (hwpoison_filter_task(p)) + return -EINVAL; + return 0; } EXPORT_SYMBOL_GPL(hwpoison_filter); |