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mm: memcontrol: convert anon and file-thp to new mem_cgroup_charge() API

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With the page->mapping requirement gone from memcg, we can charge anon and
file-thp pages in one single step, right after they're allocated.

This removes two out of three API calls - especially the tricky commit
step that needed to happen at just the right time between when the page is
"set up" and when it's "published" - somewhat vague and fluid concepts
that varied by page type.  All we need is a freshly allocated page and a
memcg context to charge.

v2: prevent double charges on pre-allocated hugepages in khugepaged

[hannes@cmpxchg.org: Fix crash - *hpage could be ERR_PTR instead of NULL]
  Link: http://lkml.kernel.org/r/20200512215813.GA487759@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Qian Cai <cai@lca.pw>
Link: http://lkml.kernel.org/r/20200508183105.225460-13-hannes@cmpxchg.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner
2020-06-03 16:02:04 -07:00
committed by Linus Torvalds
parent 468c398233
commit 9d82c69438
9 changed files with 31 additions and 82 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/events/uprobes.c
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@@ -162,14 +162,13 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
};
int err;
struct mmu_notifier_range range;
struct mem_cgroup *memcg;
mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, vma, mm, addr,
addr + PAGE_SIZE);
if (new_page) {
err = mem_cgroup_try_charge(new_page, vma->vm_mm, GFP_KERNEL,
&memcg);
err = mem_cgroup_charge(new_page, vma->vm_mm, GFP_KERNEL,
false);
if (err)
return err;
}
@@ -179,16 +178,12 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr,
mmu_notifier_invalidate_range_start(&range);
err = -EAGAIN;
if (!page_vma_mapped_walk(&pvmw)) {
if (new_page)
mem_cgroup_cancel_charge(new_page, memcg);
if (!page_vma_mapped_walk(&pvmw))
goto unlock;
}
VM_BUG_ON_PAGE(addr != pvmw.address, old_page);
if (new_page) {
get_page(new_page);
mem_cgroup_commit_charge(new_page, memcg, false);
page_add_new_anon_rmap(new_page, vma, addr, false);
lru_cache_add_active_or_unevictable(new_page, vma);
} else