If shmem_insert_page() is called to insert a page that was preserved using PKRAM on the current boot (i.e. preserved page is restored without an intervening kexec boot), the page will still be charged to a memory cgroup because it is never freed. Don't try to charge it again.
Signed-off-by: Anthony Yznaga <[email protected]> --- mm/shmem.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index 13475073fb52..1f3b43b8fa34 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -693,6 +693,7 @@ int shmem_insert_page(struct mm_struct *mm, struct inode *inode, pgoff_t index, struct mem_cgroup *memcg; pgoff_t hindex = index; bool on_lru = PageLRU(page); + bool has_memcg = page->mem_cgroup ? true : false; if (index > (MAX_LFS_FILESIZE >> PAGE_SHIFT)) return -EFBIG; @@ -738,20 +739,24 @@ int shmem_insert_page(struct mm_struct *mm, struct inode *inode, pgoff_t index, __SetPageReferenced(page); - err = mem_cgroup_try_charge_delay(page, mm, gfp, &memcg, - PageTransHuge(page)); - if (err) - goto out_unlock; + if (!has_memcg) { + err = mem_cgroup_try_charge_delay(page, mm, gfp, &memcg, + PageTransHuge(page)); + if (err) + goto out_unlock; + } err = shmem_add_to_page_cache(page, mapping, hindex, NULL, gfp & GFP_RECLAIM_MASK); if (err) { - mem_cgroup_cancel_charge(page, memcg, - PageTransHuge(page)); + if (!has_memcg) + mem_cgroup_cancel_charge(page, memcg, + PageTransHuge(page)); goto out_unlock; } - mem_cgroup_commit_charge(page, memcg, on_lru, - PageTransHuge(page)); + if (!has_memcg) + mem_cgroup_commit_charge(page, memcg, on_lru, + PageTransHuge(page)); if (!on_lru) lru_cache_add_anon(page); -- 2.13.3
