[PATCH -mm v9 2/8] hwpoison: use page_cgroup_ino for filtering by memcg
From: Vladimir Davydov <hidden>
Date: 2015-07-19 12:31:54
Also in:
cgroups, linux-mm, lkml
Subsystem:
hwpoison memory failure handling, memory management, the rest · Maintainers:
Miaohe Lin, Andrew Morton, Linus Torvalds
Hwpoison allows to filter pages by memory cgroup ino. Currently, it calls try_get_mem_cgroup_from_page to obtain the cgroup from a page and then its ino using cgroup_ino, but now we have an apter method for that, page_cgroup_ino, so use it instead. Signed-off-by: Vladimir Davydov <redacted> Reviewed-by: Andres Lagar-Cavilla <redacted> --- mm/hwpoison-inject.c | 5 +---- mm/memory-failure.c | 16 ++-------------- 2 files changed, 3 insertions(+), 18 deletions(-)
diff --git a/mm/hwpoison-inject.c b/mm/hwpoison-inject.c
index bf73ac17dad4..5015679014c1 100644
--- a/mm/hwpoison-inject.c
+++ b/mm/hwpoison-inject.c@@ -45,12 +45,9 @@ static int hwpoison_inject(void *data, u64 val) /* * do a racy check with elevated page count, to make sure PG_hwpoison * will only be set for the targeted owner (or on a free page). - * We temporarily take page lock for try_get_mem_cgroup_from_page(). * memory_failure() will redo the check reliably inside page lock. */ - lock_page(hpage); err = hwpoison_filter(hpage); - unlock_page(hpage); if (err) goto put_out;
@@ -126,7 +123,7 @@ static int pfn_inject_init(void) if (!dentry) goto fail; -#ifdef CONFIG_MEMCG_SWAP +#ifdef CONFIG_MEMCG dentry = debugfs_create_u64("corrupt-filter-memcg", 0600, hwpoison_dir, &hwpoison_filter_memcg); if (!dentry)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ef33ccf37224..97005396a507 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c@@ -130,27 +130,15 @@ static int hwpoison_filter_flags(struct page *p) * can only guarantee that the page either belongs to the memcg tasks, or is * a freed page. */ -#ifdef CONFIG_MEMCG_SWAP +#ifdef CONFIG_MEMCG 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->css; - ino = cgroup_ino(css->cgroup); - css_put(css); - - if (ino != hwpoison_filter_memcg) + if (page_cgroup_ino(p) != hwpoison_filter_memcg) return -EINVAL; return 0;
--
2.1.4
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