The patch titled Subject: mm: fork: fix kernel_stack memcg stats for various stack implementations has been removed from the -mm tree. Its filename was mm-fork-fix-kernel_stack-memcg-stats-for-various-stack-implementations-v2.patch This patch was dropped because it was folded into mm-fork-fix-kernel_stack-memcg-stats-for-various-stack-implementations.patch ------------------------------------------------------ From: Roman Gushchin <guro@xxxxxx> Subject: mm: fork: fix kernel_stack memcg stats for various stack implementations introduce mem_cgroup_from_obj() Link: http://lkml.kernel.org/r/20200324004221.GA36662@xxxxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 4d96ba353075 ("mm: memcg/slab: stop setting page->mem_cgroup pointer for slab pages") Signed-off-by: Roman Gushchin <guro@xxxxxx> Cc: Shakeel Butt <shakeelb@xxxxxxxxxx> Cc: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxxxx> Cc: Bharata B Rao <bharata@xxxxxxxxxxxxx> Cc: Shakeel Butt <shakeelb@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/memcontrol.h | 7 +++++++ mm/memcontrol.c | 27 +++++++++++++++++++++++++++ 2 files changed, 34 insertions(+) --- a/include/linux/memcontrol.h~mm-fork-fix-kernel_stack-memcg-stats-for-various-stack-implementations-v2 +++ a/include/linux/memcontrol.h @@ -1432,6 +1432,8 @@ static inline int memcg_cache_id(struct return memcg ? memcg->kmemcg_id : -1; } +struct mem_cgroup *mem_cgroup_from_obj(void *p); + #else static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order) @@ -1473,6 +1475,11 @@ static inline void memcg_put_cache_ids(v { } +static inline struct mem_cgroup *mem_cgroup_from_obj(void *p) +{ + return NULL; +} + #endif /* CONFIG_MEMCG_KMEM */ #endif /* _LINUX_MEMCONTROL_H */ --- a/mm/memcontrol.c~mm-fork-fix-kernel_stack-memcg-stats-for-various-stack-implementations-v2 +++ a/mm/memcontrol.c @@ -2672,6 +2672,33 @@ static void commit_charge(struct page *p } #ifdef CONFIG_MEMCG_KMEM +/* + * Returns a pointer to the memory cgroup to which the kernel object is charged. + * + * The caller must ensure the memcg lifetime, e.g. by taking rcu_read_lock(), + * cgroup_mutex, etc. + */ +struct mem_cgroup *mem_cgroup_from_obj(void *p) +{ + struct page *page; + + if (mem_cgroup_disabled()) + return NULL; + + page = virt_to_head_page(p); + + /* + * Slab pages don't have page->mem_cgroup set because corresponding + * kmem caches can be reparented during the lifetime. That's why + * memcg_from_slab_page() should be used instead. + */ + if (PageSlab(page)) + return memcg_from_slab_page(page); + + /* All other pages use page->mem_cgroup */ + return page->mem_cgroup; +} + static int memcg_alloc_cache_id(void) { int id, size; _ Patches currently in -mm which might be from guro@xxxxxx are mm-fork-fix-kernel_stack-memcg-stats-for-various-stack-implementations.patch mm-memcg-slab-introduce-mem_cgroup_from_obj.patch mm-kmem-cleanup-__memcg_kmem_charge_memcg-arguments.patch mm-kmem-cleanup-memcg_kmem_uncharge_memcg-arguments.patch mm-kmem-rename-memcg_kmem_uncharge-into-memcg_kmem_uncharge_page.patch mm-kmem-switch-to-nr_pages-in-__memcg_kmem_charge_memcg.patch mm-memcg-slab-cache-page-number-in-memcg_uncharge_slab.patch mm-kmem-rename-__memcg_kmem_uncharge_memcg-to-__memcg_kmem_uncharge.patch mm-memcg-make-memoryoomgroup-tolerable-to-task-migration.patch mmpage_alloccma-conditionally-prefer-cma-pageblocks-for-movable-allocations.patch mmpage_alloccma-conditionally-prefer-cma-pageblocks-for-movable-allocations-fix.patch mm-hugetlb-optionally-allocate-gigantic-hugepages-using-cma.patch mm-hugetlb-optionally-allocate-gigantic-hugepages-using-cma-fix.patch mm-hugetlb-optionally-allocate-gigantic-hugepages-using-cma-fix-2.patch mm-hugetlb-fix-hugetlb_cma_reserve-if-config_numa-isnt-set.patch